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Synthesis, characterization, and modification of 2‐allylphenoxyorganocyclotriphosphazene copolymers
Author(s) -
Wu HoShing,
Ke DengYuan
Publication year - 1996
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(19960822)61:8<1351::aid-app16>3.0.co;2-1
Subject(s) - copolymer , polymer chemistry , monomer , chemistry , reactivity (psychology) , thermal stability , glass transition , dichloromethane , styrene , polymer , methyl methacrylate , yield (engineering) , radical initiator , methacrylate , materials science , organic chemistry , solvent , medicine , alternative medicine , pathology , metallurgy
The monomer 2‐allylphenoxyorganocyclotriphosphazene I with phenoxy (or 2,2,2‐trifluoroethoxy) side group was synthesized on reacting hexachlorocyclotriphosphazene with phenol (or 2,2,2‐trifluoroethanol) and 2‐allylphenol with phase‐transfer catalysis in a dichloromethane/alkaline solution. The synthesis had a large yield (>80%) and narrow product distribution and proceeded under mild condition. The radical copolymerization of I with II (styrene, methyl methacrylate, and vinylbenzyl chloride) using azobis(isobutyrylnitrile) (AIBN) as an initiator was investigated. Reactivity ratios and Alfrey–Price parameters for copolymers were obtained. Organophosphazene monomer I was less reactive than II . The thermal stability of the copolymer with phenoxy side group was greater than that with 2,2,2‐trifluoroethoxy side group. The incorporation of organophosphazene units into an organic polymer backbone decreased the glass transition temperature and increased the thermal stability of the copolymers. Tensile measurement showed that Young's modulus tended to decrease and the polymer became softer and ductile when the incorporated amount of I increases. © 1996 John Wiley & Sons, Inc.