CN108072591B - Sample support for polymer melt online stretching and application thereof - Google Patents
Sample support for polymer melt online stretching and application thereof Download PDFInfo
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- CN108072591B CN108072591B CN201711259467.8A CN201711259467A CN108072591B CN 108072591 B CN108072591 B CN 108072591B CN 201711259467 A CN201711259467 A CN 201711259467A CN 108072591 B CN108072591 B CN 108072591B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N11/00—Investigating flow properties of materials, e.g. viscosity, plasticity; Analysing materials by determining flow properties
- G01N2011/006—Determining flow properties indirectly by measuring other parameters of the system
- G01N2011/008—Determining flow properties indirectly by measuring other parameters of the system optical properties
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Abstract
The invention relates to a sample support for polymer melt online stretching and application thereof, wherein the sample support comprises a displacement generating mechanism and a supporting needle group, the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, and the supporting needle group is driven by the displacement generating mechanism to move, so that a plurality of supporting needle groups support the lower end of a stretched polymer melt sample, the polymer melt sample does not obviously sink after being stretched, laser or X rays are not blocked, the laser or X rays can smoothly pass through the sample, online continuous acquisition of scattering data is realized, and smooth implementation of an experiment is ensured.
Description
Technical Field
The invention relates to auxiliary equipment for polymer melt tensile test, in particular to a sample support for polymer melt online tensile test and application thereof.
Background
There are two typical flow fields during polymer processing: shear flow fields and tensile flow fields. At present, a great deal of research on structural evolution under a shear flow field exists, however, the shear flow field is also called a weak flow field, because the shear flow can cause the molecular chain of the polymer to rotate so that the molecular chain deviates from the shear direction, and the capability of deforming and orienting the molecular chain is relatively weak.
In contrast, the stretching flow field can make the molecular chain extend and orient better, thereby accelerating the crystallization kinetics and changing the form and structure in the crystallization process more effectively. However, there are few reports of systematic studies on the structural evolution of polymer melt drawing processes, because of difficulties encountered in uniaxial drawing experiments on melt samples, such as sample fixation, flow collapse of the melt due to gravity, difficulty in continuing the test, etc. Although there are some studies on the extensional rheological behavior of the melt, the specific equipment used is mostly complex and expensive, mainly for the study of single polymer melts, and in addition there are some other problems such as the control of stable temperature and extensional flow conditions.
Aiming at the problems existing in the polymer melt on-line tensile test at present, the key points are the fixation of a sample and the supporting effect of a tensile state, and meanwhile, the test cannot be interfered, such as infrared rays, X rays, laser and the like which can not be interfered to smoothly pass through the sample.
Disclosure of Invention
Due to the problem of melt collapse during the polymer melt drawing process, scattering data cannot be continuously collected. In order to solve the problems, the invention provides a sample support for polymer melt online stretching, which is particularly suitable for the polymer melt online stretching test with X-rays or laser as an incident light source.
The sample support for polymer melt on-line stretching comprises a displacement generating mechanism and a supporting needle group, wherein the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, the supporting needle group is driven to move by the displacement generating mechanism, the supporting needle group comprises a bracket and a plurality of needles which are mutually fixed on the bracket in parallel and at intervals, and the extending direction of the plurality of needles of the supporting needle group is strictly consistent with the incidence angle of the laser or the X-ray, the support is used for fixing with the displacement executing end of the displacement generating mechanism, the displacement generating mechanism drives the supporting needle group to move, so that the lower ends of a plurality of supporting needle groups for the stretched polymer melt samples are supported, and the incident light is not blocked, so that the incident light smoothly passes through the stretched polymer melt sample, and the continuous acquisition of scattering data is realized. When the melt is stretched, the generating mechanism can be controlled by a program to drive the supporting needle group to move to the lower part of the melt, so that the melt sample does not sink obviously, the support is realized, the incident light such as laser or X-ray can smoothly pass through the sample, the smooth running of the experiment is ensured, and the problem that the data cannot be collected continuously on line due to the collapse of the melt is solved.
The displacement generating mechanism is a biaxial sliding mechanism and is used for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction, and the moving range along the length direction is 10-20mm and the moving range along the height direction is 10-20mm so as to meet the test requirement.
Preferably, the supporting needle group comprises a plurality of metal needles, the diameter of each metal needle is 0.5-2mm, the metal needles are welded on metal blocks with the same width as the diameter of the metal needles, 6-12 sleeves of the metal blocks welded with the metal needles are fixed on the base to form the supporting needle group, and the metal blocks can be freely inserted and replaced on the base.
In the invention, the diameter of the metal needle and the spacing between the metal blocks need to be selected with proper sizes, and the metal needle with the diameter of 0.5-2mm is preferably matched with the adjacent metal blocks with the spacing of 2-6mm, so that the melt is supported and the laser or X-ray is not interfered to smoothly pass through the melt, and more comprehensive scattering data is obtained. Taking the diameter of the metal needle as an example, if the diameter of the metal needle is smaller than 0.5mm, the melt cannot be effectively supported, and if the diameter of the metal needle is larger than 2mm, the effective area for observation can be greatly reduced, which affects the comprehensiveness of data. For the design of the spacing of the metal blocks, a spacing of more than 6mm will not allow effective support of the melt, and a spacing of less than 2mm will cause the laser or X-ray to be disturbed as it passes through the melt.
In order to solve the technical problem, the invention adopts the following scheme:
a sample support for polymer melt on-line stretching comprises a displacement generating mechanism and a supporting needle group, wherein the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, the supporting needle group is driven to move by the displacement generating mechanism, the supporting needle group comprises a bracket and a plurality of needles which are mutually fixed on the bracket in parallel and at intervals, and the extending direction of the plurality of needles of the supporting needle group is strictly consistent with the incidence angle of the laser or the X-ray, the support is used for fixing with the displacement executing end of the displacement generating mechanism, the displacement generating mechanism drives the supporting needle group to move, so that the lower ends of a plurality of supporting needle groups for the stretched polymer melt samples are supported, and the incident light is not blocked, so that the incident light smoothly passes through the stretched polymer melt sample, and the online continuous acquisition of scattering data is realized.
Furthermore, the support include needle mount and base, a plurality of needles are fixed respectively on the needle mount, the needle mount can be dismantled with the base and be connected, the base be used for with the displacement execution end of displacement generation mechanism fix.
Further, the needle holder is mounted on the base in a pluggable manner.
Furthermore, the needle fixing frame is a plurality of fixing blocks, the fixing blocks are parallel to each other and are spaced at equal intervals, and the distance between every two adjacent fixing blocks is 2-6 mm.
Furthermore, the plurality of needles are welded on the needle fixing frame, and each fixing block is welded with one needle.
Further, the diameter of the needle is 0.5-2 mm.
Further, the needle is an iron needle, a stainless steel needle or a tungsten steel needle.
Further, the support is a metal support.
Further, the displacement generating mechanism is a biaxial sliding mechanism for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction.
The invention also provides application of the sample support for the online stretching of the polymer melt, which is used for polymer melt stretching experiments.
By adopting the technical scheme, the polymer melt sample can not obviously sink after being stretched, and laser or X-ray can smoothly pass through the sample, so that the continuous acquisition of scattering data is realized, and the smooth operation of an experiment is ensured.
Drawings
FIG. 1 is a general view of an in-line stretching experimental apparatus for polymer melt provided in example 1 of the present invention;
FIG. 2 is a diagram of the use of a sample holder for in-line drawing of a polymer melt according to example 1 of the present invention;
FIG. 3 is a side view of a supporting needle group provided in embodiment 1 of the present invention;
FIG. 4 is a plan view of a supporting pin group provided in embodiment 1 of the present invention;
fig. 5 is a plan view of the supporting pin group provided in embodiment 2 of the present invention.
Detailed Description
The present invention will be further described with reference to the following drawings and examples, which may be in various forms and should not be construed as being limited to the description set forth herein. Like reference numerals refer to like elements throughout, and similar reference numerals refer to similar elements.
Example 1:
referring to fig. 1, an on-line tensile test of a polymer melt 11 is carried out by using the apparatus of fig. 1, which mainly comprises a sample support 10 for on-line tensile test of the polymer melt and a biaxial tensile tester 14, wherein a CCD image acquisition device 12, a reflective mirror 13, a laser or X-ray receiving device 16 and a heating device 15 are mounted on the biaxial tensile tester 14, wherein the heating device 15 is used for heating the polymer melt 11, the CCD image acquisition device 12 can acquire the change of the appearance of the polymer melt 11 during the heating and tensile test so as to record the deformation of the polymer melt 11 through the reflective mirror 13, a hole is formed in the middle of the reflective mirror 13, the laser or X-ray is irradiated onto the polymer melt 11 through the hole in the middle of the reflective mirror 13, the laser or X-ray receiving device 16 is placed behind the polymer melt 11, and the laser or X-ray receiving device, the properties of the polymer melt 11 were then analyzed.
Referring to fig. 2, the sample holder for polymer melt on-line stretching includes a displacement generating mechanism 101 and a supporting needle set 102, the displacement generating mechanism 101 is a biaxial sliding mechanism for adjusting the displacement of the supporting needle set along the length direction and the displacement of the supporting needle set along the height direction, the displacement generating mechanism 101 can be horizontally (left and right) adjusted by 10-20mm and vertically (up and down) adjusted by 10-20mm, and the supporting needle set 102 is driven by the displacement generating mechanism 101 to move, so that the plurality of supporting needle sets support the lower end of the stretched polymer melt sample 11, and the melt is prevented from collapsing. The supporting needle set 102 comprises a support and a plurality of needles, the plurality of needles are fixed on the support in parallel and at intervals, and the extending direction of the plurality of needles of the supporting needle set 102 is strictly consistent with the incidence direction of the laser or the X-ray, so that the laser or the X-ray is irradiated on the stretched polymer melt sample 11 through the hole 131 in the middle of the reflector 13 without interference, and the continuous collection of scattering data is realized.
The specific structure of the supporting needle group refers to fig. 3 and 4, the supporting needle group comprises 7 needles 1 and a support, the support comprises a needle fixing frame 2 and a base 3, the 7 needles 1 are respectively fixed on the needle fixing frame, the needle fixing frame is detachably connected with the base, and the base is used for fixing the displacement executing end of the displacement generating mechanism.
Further, 7 needles 1 all are the iron needle, and its diameter is 1mm, connects on needle mount 2 through welding mode, and the width of needle mount 2 is greater than the iron needle diameter, and the distance between the adjacent needle mount 2 is 2mm, and needle mount 2 can freely be inserted and pulled on the base and change.
In order to avoid the polymer melt from being contaminated by the displacement generating mechanism, a boss 4 is arranged at one end of the base 3, and the needle fixing frame 2 is arranged on the boss 4 so as to lift the whole supporting needle group.
The base 3 is also symmetrically provided with 4 screw holes 5, and bolts or screws penetrate through the screw holes 5 to fixedly install the base 3 on the sliding table.
The design of the sample support can ensure that a polymer melt sample does not sag obviously after being stretched, and laser or X rays can smoothly pass through the sample, so that the online continuous acquisition of scattering data is realized, and the smooth operation of an experiment is ensured.
Example 2:
as shown in fig. 5, the supporting needle set comprises 6 tungsten steel needles 6 with a diameter of 0.5mm, metal blocks (not shown) with the same width as the tungsten steel needles 6 and a distance of 4mm between the adjacent metal blocks are fixed on the boss 4 in a pluggable manner, and the tungsten steel needles 6 are welded on the metal blocks.
The extension direction of 6 tungsten steel needles 6 in the supporting needle group is strictly consistent with the incident angle of laser or X ray, the support be used for with the displacement execution end of displacement generation mechanism fix, displacement generation mechanism drive the supporting needle group and move, make a plurality of lower extremes to the stretched polymer melt sample of supporting needle group support, and do not block laser or X ray and pass through the stretched polymer melt sample smoothly to realize the online continuity collection of scattering data.
The displacement generating mechanism is a biaxial sliding mechanism and is used for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction.
The width of the metal block is equal to the diameter of the metal needle, so that laser or X-rays can penetrate through the gap of the sample support stretched on line by the polymer melt, and convenience is brought to debugging of test equipment. Moreover, when the metal needle is welded, the metal block with the same width as the diameter of the metal needle can more easily realize the positioning effect on the metal needle.
Example 3:
a sample support for polymer melt on-line stretching comprises a displacement generating mechanism and a supporting needle group, wherein the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, the supporting needle group is driven to move by the displacement generating mechanism, the supporting needle group comprises a bracket and a plurality of needles which are mutually fixed on the bracket in parallel and at intervals, and the extending direction of the plurality of needles of the supporting needle group is strictly consistent with the incidence angle of the laser or the X-ray, the support is used for fixing with the displacement executing end of the displacement generating mechanism, the displacement generating mechanism drives the supporting needle group to move, so that the lower ends of a plurality of supporting needle groups for the stretched polymer melt samples are supported, and the incident light is not blocked, so that the incident light smoothly passes through the stretched polymer melt sample, and the online continuous acquisition of scattering data is realized.
The displacement generating mechanism is a biaxial sliding mechanism and is used for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction.
The support comprises a needle fixing frame and a base, the needle fixing frame is installed on the base in a pluggable mode, a plurality of needles are fixed on the needle fixing frame respectively, and the base is used for being fixed with the displacement executing end of the displacement generating mechanism. The needle mount be a plurality of metal blocks, a plurality of metal blocks are parallel to each other and the interval equals, the interval of adjacent metal block is 4 mm.
The support needle group include 8 metal needles, its diameter is 1.2mm, the metal needle welding on with the metal needle diameter equal width's metal block, the metal block is connected with base detachable.
The design of the sample support can ensure that a polymer melt sample does not sag obviously after being stretched, and laser or X rays can smoothly pass through the sample, thereby realizing the continuous acquisition of scattering data and ensuring the smooth operation of experiments.
Example 4:
a sample support for polymer melt on-line stretching comprises a displacement generating mechanism and a supporting needle group, wherein the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, the supporting needle group is driven to move by the displacement generating mechanism, the supporting needle group comprises a bracket and a plurality of needles which are mutually fixed on the bracket in parallel and at intervals, and the extending direction of the plurality of needles of the supporting needle group is strictly consistent with the incidence angle of the laser or the X-ray, the support is used for fixing with the displacement executing end of the displacement generating mechanism, the displacement generating mechanism drives the supporting needle group to move, so that the lower ends of a plurality of supporting needle groups for the stretched polymer melt samples are supported, and the incident light is not blocked, so that the incident light smoothly passes through the stretched polymer melt sample, and the online continuous acquisition of scattering data is realized.
The displacement generating mechanism is a biaxial sliding mechanism and is used for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction.
The support include needle mount and base, all be made of iron, the needle mount install with inserting on the base, a plurality of needles are fixed respectively on the needle mount, the base be used for with the displacement execution end of displacement generation mechanism fix. The needle mount be a plurality of iron plates, a plurality of iron plates are parallel to each other and the interval equals, the interval of adjacent iron plate is 5 mm.
Support needle group include 10 metal needles, its diameter is 2mm, the metal needle welding on the iron plate with the metal needle diameter aequilate, 10 sets of iron plate that weld the metal needle are fixed and are formed support needle group on the base, the iron plate can freely be inserted and pulled on the base and change.
The design of the sample support gives consideration to the support of the melt and the smooth passing of the laser or X-ray through the melt without interference, so that the online continuous acquisition of scattering data is realized, and the smooth proceeding of the experiment is ensured.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (7)
1. A sample support for on-line stretching of polymer melt is characterized in that: the sample support comprises a displacement generating mechanism and a supporting needle group, the supporting needle group is arranged at a displacement executing end of the displacement generating mechanism, the supporting needle group is driven by the displacement generating mechanism to move, the supporting needle group comprises a support and a plurality of needles, the plurality of needles are mutually fixed on the support in parallel at intervals, the extending directions of the plurality of needles of the supporting needle group are strictly consistent with the incident angle of laser or X-ray, the support is used for being fixed with the displacement executing end of the displacement generating mechanism, and the displacement generating mechanism drives the supporting needle group to move, so that the plurality of needles of the supporting needle group support the lower ends of stretched polymer melt samples without blocking incident light, and the incident light smoothly passes through the stretched polymer melt samples, thereby realizing the continuous acquisition of scattering data; the support include needle mount and base, a plurality of needles are fixed respectively on the needle mount, the needle mount can be dismantled with the base and be connected, the base be used for with displacement execution end of displacement generation mechanism fix, the needle mount be a plurality of fixed blocks, a plurality of fixed blocks are parallel to each other and the interval equals, the interval between the adjacent fixed block is 2-6mm, the diameter of a plurality of needles is 0.5-2 mm.
2. A polymer melt in-line drawn specimen holder according to claim 1, wherein: the needle fixing frame is installed on the base in a pluggable mode.
3. A polymer melt in-line drawn specimen holder according to claim 1, wherein: the plurality of needles are welded on the needle fixing frame, and each fixing block is welded with one needle.
4. A polymer melt in-line drawn specimen holder according to claim 1, wherein: the needles are iron needles, stainless steel needles or tungsten steel needles.
5. A polymer melt in-line drawn specimen holder according to claim 1, wherein: the support is a metal support.
6. A polymer melt in-line drawn specimen holder according to claim 1, wherein: the displacement generating mechanism is a biaxial sliding mechanism and is used for adjusting the displacement of the supporting needle group along the length direction and adjusting the displacement of the supporting needle group along the height direction.
7. Use of a polymer melt in-line drawn specimen holder according to any one of claims 1 to 6 for in-line testing of polymer melt draw tests.
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| CN201711259467.8A CN108072591B (en) | 2017-12-04 | 2017-12-04 | Sample support for polymer melt online stretching and application thereof |
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| CN201711259467.8A CN108072591B (en) | 2017-12-04 | 2017-12-04 | Sample support for polymer melt online stretching and application thereof |
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| CN108072591A (en) | 2018-05-25 |
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