CN110346548A - The evaluation method of gutta-percha modified pitch shape-memory properties - Google Patents
The evaluation method of gutta-percha modified pitch shape-memory properties Download PDFInfo
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- 239000000899 Gutta-Percha Substances 0.000 title claims abstract description 29
- 240000000342 Palaquium gutta Species 0.000 title claims abstract description 29
- 229920000588 gutta-percha Polymers 0.000 title claims abstract description 29
- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 238000012360 testing method Methods 0.000 claims abstract description 46
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000004044 response Effects 0.000 claims abstract description 5
- 238000009472 formulation Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 4
- 230000007334 memory performance Effects 0.000 claims description 4
- 238000000879 optical micrograph Methods 0.000 claims description 3
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 238000005461 lubrication Methods 0.000 claims description 2
- 229920000431 shape-memory polymer Polymers 0.000 abstract description 12
- 239000000463 material Substances 0.000 abstract description 6
- 238000010998 test method Methods 0.000 abstract description 5
- 239000010426 asphalt Substances 0.000 abstract description 3
- 238000005259 measurement Methods 0.000 abstract description 2
- 229920000642 polymer Polymers 0.000 description 8
- 238000011084 recovery Methods 0.000 description 6
- 238000012512 characterization method Methods 0.000 description 4
- 230000005526 G1 to G0 transition Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 201000010099 disease Diseases 0.000 description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003446 memory effect Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000013139 quantization Methods 0.000 description 2
- 230000002441 reversible effect Effects 0.000 description 2
- 239000012781 shape memory material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000009477 glass transition Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/22—Investigating strength properties of solid materials by application of mechanical stress by applying steady torsional forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/42—Road-making materials
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0021—Torsional
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/067—Parameter measured for estimating the property
- G01N2203/0682—Spatial dimension, e.g. length, area, angle
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
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Abstract
The present invention is a kind of evaluation method of gutta-percha modified pitch shape-memory properties, belong to asphalt pavement material technical field, in order to solve the problems, such as current gutta-percha modified pitch shape-memory properties test method it is single, characterizing method lack, correlation test is cumbersome and is difficult to determine its optimum formula.The method comprises the steps of firstly, preparing gutta-percha modified pitch out, are processed into cuboid test specimen；Then it is tested using the torsion device of test shape-memory properties, measurement is after different operation step, and gutta-percha modified pitch is by the torsion angle after being torqued into reply；Fixed rate, the response rate for finally calculating gutta-percha modified pitch, evaluate its shape-memory properties, advanced optimize gutta-percha modified pitch formula and preparation process accordingly.Shape-memory properties evaluation method provided by the invention solves the test method for the shape-memory properties for lacking gutta-percha modified pitch at present, and enriches the shape-memory properties evaluation method of shape-memory polymer.
Description
Technical field
The present invention is a kind of evaluation method of gutta-percha modified pitch shape-memory properties, belongs to asphalt pavement material technology
Field.
Background technique
In recent years, due to development in science and technology and application demand, various new materials are greatly developed.Shape memory polymers
Object is widely applied, the study found that shape-memory polymer all has because of excellent shape memory effect in numerous areas
Have a two phase structure, i.e., the stationary phase of memory original shape and vary with temperature reversibly solidify and soften can anti-phase.This its
In, cross-linked structure, partially crystallizable structure, winding of the glassy state of polymer, supra polymer chain of polymer etc. are stationary phase, and
It generates the partially crystallizable phase of crystallization and crystalline fusion reversible change or glassy state and rubbery state reversible transition (glass transition temperature occurs
Tg phase structure) is then can anti-phase.Shape-memory polymer either one-component polymer, be also possible to softening temperature
Difference, but the copolymer or mixture of the good two kinds of components of compatibility.
Polymer itself has complicated microcosmos structure characteristic.The length of strand differs greatly with diameter, chain it is soft and
Be easy to entangled to each other, each strand it is different in size, it is difficult to form regular perfect crystal structure；And high polymer is non-crosslinked
When, once heating temperature is more than its crystalline melt point, it will appear as temporary flowing property, can not observe memory characteristic；In addition, grinding
Study carefully with application process, shape-memory properties are influenced again by factors and restriction.Therefore, it is difficult to the shape of polymer
Memory performance carries out accurately quantization and evaluation, it is difficult to find effective method to improve the shape-memory properties of certain material.
In recent years, Chinese Economy Development is rapid, and people's travel amount is caused to increase, and VMT Vehicle-Miles of Travel increases, in addition, large-scale
Lorry and overloaded vehicle increase, and bring biggish load to bituminous pavement, thereby produce serious cracking disease, even
Pavement structure is destroyed, the durability and aesthetics that bituminous pavement uses are influenced.Therefore, road researcher wishes shape memory
Material is added in pitch, assigns bituminous pavement shape-memory properties, meanwhile, effective method is proposed to evaluate its shape memory
Performance.
Currently, researcher leads to common shape fixed rate, shape recovery rate, shape regeneration rate etc. to shape-memory properties
Index is characterized.Shape fixed rate, which refers to, is heated to deformation temperature for shape-memory polymer, implements to deform to it with external force,
Be cooled to room temperature under external force constraint, after removing external force, material at room temperature its deformation quantity kept and it is heated when external force
Under the ratio between deformation quantity.Shape recovery rate refers to that deformation that reply is balanced after shape-memory polymer is heated and material original are fixed
The ratio between deformation.Recovery of shape rate refer to the shape recovery rate of shape-memory polymer within the temperature range of 10%~90%,
The percentage of unit time thermal shape memory polymer completion deformation-recovery.Fixed rate, the response rate of shape-memory polymer
And recovery rate is higher, shape memory effect is better.
Pitch is added in shape-memory polymer by consulting literatures discovery, assign the research of bituminous pavement shape-memory properties compared with
Few, more single to the test method and characterization method of bituminous pavement shape-memory properties, more researchs concentrate on shape note
Recall polymer itself, such as the application of exploitation, modification of type, the extension of a variety of driving methods.
The present invention provides a kind of shape-memory properties that bituminous pavement different from the past is stretched, compressed and sheared
Test mode, be changed to torsion test, there has also been certain variations for characterization method, and torsion angle variation ratio is utilized to carry out shape note
Recall performance characterization, not only enrich the evaluation method of shape-memory properties, also there is good operability.
Summary of the invention
(1) technical problem
It is an object of the present invention to provide a kind of evaluation methods of gutta-percha modified pitch shape-memory properties, solve current Cortex Eucommiae
The single, characterizing method of the test method of the shape-memory properties of glue modified pitch lacks, it is difficult to which determining has shape memory
The gutta-percha modified pitch optimum formula problem of performance.
(2) technical solution
It is lacked to solve the single, the characterizing method of test method of the shape-memory properties of current gutta-percha modified pitch
It is few, it is difficult to determine the gutta-percha modified pitch optimum formula problem with shape-memory properties.The present invention provides a kind of gutta-percha
The evaluation method of the shape-memory properties of modified pitch, its technical solution is as follows: prepare gutta-percha modified pitch first, by itself plus
Work sets up cuboid test specimen, will after being lubricated to upper end inward flange in the middle part of the crane torsion test device of test shape-memory properties
Test specimen is put into device groove, holds top rotating handles, when (top cover) rotates to certain angle when device top, uses hold-down bars
It is fixed, record torsion angle1；Then it maintains test specimen in this torsional deflection at room temperature, remove hold-down bars and removes device top,
After allowing test specimen freely to turn round a period of time, torsion angle is recorded2, test specimen is put into baking oven, it is made to give full play to shape memory
It can be carried out reply, using optical microphotograph sem observation, test specimen torsion angle after measurement is replied3, finally calculate gutta-percha modified pitch
Fixed rate, response rate evaluate its shape-memory properties, and advanced optimize the formula and preparation process of gutta-percha modified pitch.
(3) beneficial effect
Shape-memory polymer has the stationary phase of memory original shape and varies with temperature energy as shape-memory material
Reversibly solidify and soften can anti-phase two phase structure, be added in pitch and its mixture as modifying agent, Neng Goufu
Pitch shape-memory properties are given, self-healing effect is played, reduce Asphalt Pavement Cracking disease.But its complicated microcosmos structure characteristic,
Sometimes it is difficult to observe memory characteristic；In addition, research is with application process, shape-memory properties are influenced by factors again
With restriction.
Therefore, the present invention provides a kind of shape that shape-memory polymer different from the past is stretched, compresses and sheared
The test mode of shape memory performance, is changed to torsion test, can be carried out accurately quantization and evaluation to the shape memory of pitch, no
The evaluation method for only enriching shape-memory properties increases characterization method, also has good operability.
Detailed description of the invention
The crane torsion test device of Fig. 1 test gutta-percha modified pitch shape-memory properties
1 --- device top (top cover) 2 --- (sleeve) 3 in the middle part of device --- device lower part (pedestal)
4 --- hollow out area in the middle part of round hold-down bars 5 --- 360 ° of graduation marks 6 --- device
7 --- rotating handles 8 --- test specimen upper groove 9 --- test specimens
10 --- spud pile mouth 11 --- spud pile 12 --- hold-down bars sockets
13 --- test specimen lower groove
Specific embodiment
The present invention provides a kind of evaluation method of gutta-percha modified pitch shape-memory properties, and specific implementation step is as follows:
(1) gutta-percha modified pitch is prepared, it is highly the length of 60mm that being processed into length, which is 15mm, width 15mm,
Cube test specimen carries out proper lubrication to upper end inward flange in the middle part of the crane torsion test device of test shape-memory properties, reduces friction
Power facilitates top to rotate, and test specimen is placed in the crane torsion test device groove of test shape-memory properties；
(2) it holds top rotating handles at room temperature slowly to be rotated, when device top, (top cover) rotates to certain angle
When spending, stop rotating, by hold-down bars from device top (top cover) in the middle part of the insertion apparatus in the hold-down bars socket of (sleeve) into
Row is fixed, and the torsion angle of test specimen at this time is recorded1；
(3) test specimen is maintained hold-down bars to be removed, by device top (top cover) after standing 1h in this torsional deflection at room temperature
(sleeve) removes above in the middle part of from device, and test specimen can freely be turned round, and after placing for 24 hours, records the torsion angle of test specimen at this time2；
(4) test specimen is put into and replys 1h with the consistent baking oven of pitch road surfaces maximum operation (service) temperature, give full play to it
Shape memory can be carried out reply, reply situation using optical microphotograph sem observation, and measure the torsion angle of test specimen after reply3；
(5) fixed rate (θ of gutta-percha modified pitch test specimen is calculated2/θ1) and response rate ((θ2-θ3)/θ2), evaluate gutta-percha
The shape-memory properties of modified pitch advanced optimize the formula and preparation process of gutta-percha modified pitch accordingly.
Claims (1)
1. a kind of evaluation method of gutta-percha modified pitch shape-memory properties, it is characterised in that the specific steps of this method are such as
Under:
(1) gutta-percha modified pitch is prepared, it is highly the cuboid of 60mm that being processed into length, which is 15mm, width 15mm,
Test specimen carries out proper lubrication to upper end inward flange in the middle part of the crane torsion test device of test shape-memory properties, reduces frictional force, side
Just top rotates, and test specimen is placed in the crane torsion test device groove of test shape-memory properties；
(2) top rotating handles are held at room temperature slowly to be rotated, when device top, (top cover) rotates to certain angle,
It stops rotating, hold-down bars is consolidated in the hold-down bars socket of (sleeve) in the middle part of insertion apparatus from device top (top cover)
It is fixed, record the torsion angle of test specimen at this time1；
(3) it maintains test specimen in this torsional deflection at room temperature, after standing 1h, removes hold-down bars, by device top (top cover) from dress
It sets middle part (sleeve) to remove above, test specimen can freely be turned round, after placing for 24 hours, record the torsion angle of test specimen at this time2；
(4) test specimen is put into and replys 1h with the consistent baking oven of pitch road surfaces maximum operation (service) temperature, it is made to give full play to shape
Memory performance is replied, and replys situation using optical microphotograph sem observation, and measure the torsion angle of test specimen after reply3；
(5) fixed rate (θ of gutta-percha modified pitch test specimen is calculated2/θ1) and response rate ((θ2-θ3)/θ2), evaluation gutta-percha is modified
The shape-memory properties of pitch advanced optimize the formula and preparation process of gutta-percha modified pitch accordingly.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111929266A (en) * | 2020-09-04 | 2020-11-13 | 南京林业大学 | Shape memory mechanism analysis method of gutta-percha modified asphalt |
| CN111982712A (en) * | 2020-08-19 | 2020-11-24 | 南京林业大学 | Evaluation method for self-healing performance of shape memory gutta-percha modified asphalt |
| CN111983205A (en) * | 2020-07-24 | 2020-11-24 | 广西交投科技有限公司 | Castle rut test-based asphalt mixture rut-resistant design method |
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Application publication date: 20191018 |