GB2199836A - Preparation of uranyl polymers - Google Patents
Preparation of uranyl polymers Download PDFInfo
- Publication number
- GB2199836A GB2199836A GB08024295A GB8024295A GB2199836A GB 2199836 A GB2199836 A GB 2199836A GB 08024295 A GB08024295 A GB 08024295A GB 8024295 A GB8024295 A GB 8024295A GB 2199836 A GB2199836 A GB 2199836A
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- GB
- United Kingdom
- Prior art keywords
- uranyl
- polymer
- monomer
- solvent
- irradiation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F30/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal
- C08F30/04—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and containing phosphorus, selenium, tellurium or a metal containing a metal
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
A method for the production of a uranyl homo- or co-polymer comprises dissolving an unsaturated polymerisable uranyl monomer in a substantially non-aqueous solvent, exposing said dissolved monomer to irradiation at a suitable wavelength, wherein the monomer acts as the photosensitizer. A co-polymerisable monomer which is soluble in said solvent may also be present to form a co-polymer.
Description
TITLE
METHOD FOR THE PRODUCTION OF URANYL POLYMERS AND
URANYL POLYMERS PRODUCED THEREBY he present invention relates to uranyl homo- and Co- polymers and to a method for their production.
The production of vinyl and related polymers bg irradiation of suitable monomers by ultra violet radiation has been known for some time. Usuallg such polymerisations are perfected utilizing a sensitiser which may be an inorganic salt. Uranium salts have been found to be particularly effective in promoting polymerisation as having inorganic uranyl compounds. Such sensitisers act as catalysts and are not incorporated into the eventual polymer molecule.
This photo-polymerisation process of vinyl and related monomers proceeds by a free radical mechanism. (See Encaclopedia of Polymer Technology
Volume 10, lnterscience Publishers, New Pork), The free radical mechanism depends initially upon the production of free radicals by the irradiation of uranyl ions to cause polymerisation.
This production of free radicals usually takes place in a solvent which is a solvent for the monomers concerned but not for the eventual polymer.
Thus, the chain length of any given polymer will be in such circumstances a function of the molecular weight at which the polymer precipitates from the monomer solvent. Purthermore, chain termination of the polymerising molecule occurs when a similar growing molecule is joined thereto.
Thus, the rate of polymerisation is the function of time and the number of activated radicals.
As will be appreciated, the number of chain terminated molecules as a proportion of the unterminated molecules which have merely precipitated from the solvent by virtue of their chain length, determines the stability of the eventual polymer.
Obviously, the higher proportion of chain terminated molecules the greater the stability of the eventual polymer.
We have now found that bg use of a uranyl ion in the molecule of the initiating molecule, not only can the use of a separate sensitiser be avoided but also by virtue of the speed of reaction a higher number of chain terminated molecules can be provided thereby providing a polymer of increased stability.
According to one feature of the present invention, therefore, there is provided a method for the production of a uranyl homo- or copolymer which comprises dissolving an unsaturated polymerisable uranyl monomer in a substantially non-aqueous solvent, exposing said dissolved monomer to irradiation at a suitable wave-length and isolating the resultant polymer. A second polymerisable monomer such as an unsaturated carboxylic monomer or an ester of the same may be added to the solvent prior to polymerisation so long as said second monomer is soluble in said solvent. The result of this addition is the formation of a copolymer.
According to a further feature of the invention there is provided a uranyl homo- or co- polymer wherein the uranyl moiety forms a part of the polymer backbone.
According to another feature of the invention there is provided an unsaturated photo-polymerizable urangl monomer in admixture with a substantially non-aqueous solvent therefor said monomer forming a respective polymer on suitable irradiation.
The isolation of the resultant polymer i; generally effected by providing that the solvent for the monomer or monomers is not a solvent for the eventual homo- or co- polymer produced.
Careful selection of the solvent to be used influences the molecular weight of the eventual polymer. This eventual molecular weight is also influenced bg the time, intensity, and wave length of the irradiation utilized which may be selected for optimum results. On precipitation of the eventual polymer from the non-solvent the polymer may be isolated by means well known in the art.
It is most preferred that the uranyl monomer is a vinyl monomer, for example uranyl diacrylate and the solvent is a lower alchol, for example ethanol. The irradiation may be effected conveniently at a wave length within the range 300 to 600 nm, and preferably within the range 320 - 430 nm.
One embodiment of the present invention will now be described by wag of illustration only in the following Sowmple:- 25 ml. of a 0.2 mol. solution of uranyl diacrylate in ethanol containing 0.2 mol. of methylmethacrylate were irradiated in a glass flask under an exclusive nitrogen atmosphere. Irradiation was effected by a 150 watt quartz/halogen lamp. Within one hour a substantial amount of polymer precipitated from the solution and was isolated therefrom by removal from the flask and drying. Analysis of the resultant polymer showed that it contained uranium in approximately the expected stoichometric proportions.
Thus, it will be seen that the irradiation of vinyl monomers as shown above allows for sensitive control of polymer molecular weights and the production of a stable polymer. The speed of reaction which is superior to that attainable by the prior art methods utilizing uranium ions alone not only allo for a more economical use of plant but as stated above, leads to a higher proportion of terminated chains.
The present invention includes therefore in addition to the method set forth, the products of said method and articles made of gulch a polymer.
Claims (7)
1. A method for the production of a uranyl homo- or co-polymer which comprises dissolving an unsaturated polymerisable uranyl monomer in a substantially non-aqueous solvent, exposing said dissolved monomer to irradiation at a suitable wavelength and isolating the resultant polymer.
2. A method as claimed in claim 1 wherein a second polymerisable monomer soluble in said solvent is added prior to irradiation to form a co-polymer.
3. A method as claimed in claim 1 or claim 2 wherein the solvent for the monomer is a non-solvent for the resultant polymer, and the polymer is thereby isolated by precipitation.
4. A method as claimed in any preceding claim wherein the uranyl monomer is a vinyl monomer such as uranyl diacrylate and the solvent is a lower alcohol such as ethanol.
5. A method as claimed in any preceding claim wherein irradiation is effected at a wavelength in the range 320 to 430nm. 43
6. A method substantially as hereinbefore described with reference to the example.
7. A uranyl homo- or co-polymer whenetRr produced by the method claimed in any one of claims 1 to 6.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB7925721 | 1979-07-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2199836A true GB2199836A (en) | 1988-07-20 |
| GB2199836B GB2199836B (en) | 1988-11-30 |
Family
ID=10506725
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08024295A Expired GB2199836B (en) | 1979-07-24 | 1980-07-24 | Method for the production of uranyl polymers and uranyl polymers produced thereby |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2199836B (en) |
-
1980
- 1980-07-24 GB GB08024295A patent/GB2199836B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| GB2199836B (en) | 1988-11-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |