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Morphology and properties of α‐methylstyrene and butadiene diblock copolymers
Author(s) -
Hsiue GinHo,
Yang ChienHua
Publication year - 1980
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.1980.070250818
Subject(s) - copolymer , polybutadiene , tetrahydrofuran , toluene , materials science , polymer chemistry , polymerization , morphology (biology) , solvent , texture (cosmology) , benzene , viscoelasticity , chemical engineering , polymer , composite material , chemistry , organic chemistry , image (mathematics) , artificial intelligence , biology , computer science , engineering , genetics
Diblock copolymers of α‐methylstyrene and butadiene were synthesized, using n ‐BuLi as initiator, toluene as solvent, and tetrahydrofuran (THF) as accelerator. The addition of a small amount of THF in polymerization solution would greatly increase the 1,2‐addition of polybutadiene. However, this effect leveled off gradually as the amount of THF increased. Electron microscopic texture and viscoelasticity of diblock copolymer samples cast from THF, toluene, benzene and CCl 4 were examined. Two peaks were observed in the dynamic mechanical loss (tan δ) curve at −27 and 145°C, corresponding to segmental motions of polybutadiene and poly‐α‐methylstyrene, respectively. This showed the microphase separation of the block copolymers. Different electron microscopic textures were observed for same sample cast from different solvents.