Premium
Preparation and properties of ester or cyano group substituted ring‐opening polymers and their hydrogenated derivatives
Author(s) -
Yoshida Yoshinori,
Goto Kohei,
Komiya Zen
Publication year - 1997
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(19971010)66:2<367::aid-app17>3.0.co;2-v
Subject(s) - monomer , polymer , polymer chemistry , glass transition , materials science , thermal stability , polymerization , copolymer , ring opening polymerization , metathesis , ring opening metathesis polymerisation , chemical engineering , chemistry , organic chemistry , composite material , engineering
Ester or cyano substituted tetracyclo [4.4.0.1 2,5 .1 7,10 ]dodec‐3‐enes (1) were synthesized and their metathesis ring‐opening polymerization was examined. The tungsten‐based ternary catalyst system polymerized them very well. The polymers showed high glass transition temperatures ( T g ) and no evidence of crystallization (e.g., the T g of the polymer derived from 8‐methyl‐8‐methoxycarbonyl substituted monomer (1a) was 207°C, and colorless transparent films could be casted from the solution of the polymer). The stability of these high T g polymers were too unstable, so practical thermal molding methods could not be applied to them. The hydrogenation of these polymers with a palladium catalyst decreased T g and greatly increased thermal stability. The physical and thermal properties of the hydrogenated polymers were thoroughly investigated. Monomer 1 was successfully copolymerized with other cyclic olefins. The resultant copolymers were hydrogenated, giving thermally stable polymers. In all cases examined in this study, a decrease of T g by hydrogenation was about 35°C, regardless of the monomer structure. These results indicate that the main‐chain mobility is the major contribution to the decrease of T g . © 1997 John Wiley & Sons, Inc. J Appl Polym Sci 66: 367–375, 1997