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Polystyrene crosslinked with oligomeric and polymeric poly(dimethyl siloxane) derivatives. Thermal and dynamic mechanical studies
Author(s) -
Tenhu Heikki,
Heino EevaLeena
Publication year - 1992
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.1992.070440106
Subject(s) - molar mass , polystyrene , siloxane , materials science , bifunctional , polymer chemistry , polymer , styrene , viscosity , rheology , copolymer , chemical engineering , composite material , chemistry , organic chemistry , catalysis , engineering
Styrene has been copolymerized with various bifunctional poly(dimethyl siloxane) cross‐linkers having molar masses in the range 200–35,000. Calorimetric and rheological measurements show that the crosslinkers change T g , T ll , and T exo , as well as melt viscosity and elasticity of polystyrene. These changes are strongly dependent on the molar mass of the crosslinker. Increasing the length of the siloxane crosslinker lowers T g and melt viscosity, if the molar mass of the crosslinker is in a range 200–2000. Copolymerizing styrene with a bifunctional poly(dimethyl siloxane) having molar mass near 35,000 leads to a phase‐separated polymer where polystyrene phase largely retains its original properties.