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Morphology and properties of α-methylstyrene and butadiene diblock copolymers

✍ Scribed by Gin-Ho Hsiue; Chien-Hua Yang

Publisher
John Wiley and Sons
Year
1980
Tongue
English
Weight
457 KB
Volume
25
Category
Article
ISSN
0021-8995

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✦ Synopsis

Abstract

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.

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