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Hexamethyl cyclotrisiloxane–styrene block copolymers and their chemical composition
Author(s) -
Varshney S. K.,
Khanna D. N.
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.1980.070251105
Subject(s) - copolymer , polystyrene , styrene , gel permeation chromatography , polymer chemistry , polydimethylsiloxane , materials science , polymerization , amorphous solid , molar mass distribution , chemical engineering , polymer , chemistry , organic chemistry , nanotechnology , composite material , engineering
Triblock copolymers of hexamethyl cyclotrisiloxane (D 3 ) and styrene were synthesized by first preparing “living” species of polystyrene dianion followed by polymerization of D 3 . The chain lenght of polymeric blocks could be controlled in a predictable fashion leading to a central hard block of polystyrene and the two end segments of amorphous polydimethylsiloxane having narrow molecular weight distribution, were characterized by gel permeation chromatography. The chemical composition of block copolymers was determined by silicon analysis and infrared and nuclear magnetic resonance spectra. Thermal aging of block copolymers at 150, 200, and 300°C was also discussed.