ISSN:
0025-116X
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Photo-dimerizable carboxylic acids were grafted onto linear silicone copolymers by amine catalyzed esterification of pendant epoxypropyl groups. The epoxy-carboxy reaction was found to surpass in experimental simplicity, chemical selectivity and reproducibility, the modification methods involving the hydrosilylation of functionalized olefins. Liquid, photo-crosslinkable polymers (8a and 8b) were finally obtained after acetylation of the hydroxy-ester groups resulting from the addition of functional carboxylic acids, and no unwanted side-reaction was detected. The practical sensitivity of photo-reactive polysiloxanes of various average molecular weights containing 5-17 mol-% of sensitive units, was measured by photoresist type insolubilization tests. The ultimate acetylation reaction was shown to have little or no influence on the dimerization process of 2-cyano-5-phenyl-2,4-pentadienoic derivatives (8a), but to increase the rate of disappearance of trans-cinnamic groups (in 8b) submitted to UV light irradiation.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/macp.1989.021900211
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