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Preparation of block copolymers with polymeric azocarbamate as an initiator
Author(s) -
Yürük H.,
Özdemir A. B.,
Baysal B. M.
Publication year - 1986
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/app.1986.070310720
Subject(s) - copolymer , propylene oxide , ethylene oxide , polymer chemistry , polystyrene , styrene , materials science , oxide , polymerization , polymer , composite material , metallurgy
Block copolymers containing polystyrene and poly(ethylene oxide) or poly(propylene oxide) segments were prepared via chemical reactions. A stepwise procedure was first employed to prepare macroazocarbamates by capping poly(ethylene oxide) glycols or poly(propylene oxide) glycols and an aliphatic diisocyanate and subsequently by reacting this intermediate with an azobisalcohol. This macroazocarbamate was later used to initiate free radical polymerization at elevated temperatures. Styrene contents, molecular weights, and elastic modulus‐temperature relationships were determined.