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Novel thermally resistant polysilphenylenesiloxanes with a high content of vinyl substituents
Author(s) -
Liu Yang,
Imae Ichiro,
Kawakami Yusuke
Publication year - 2004
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1506
Subject(s) - thermogravimetric analysis , differential scanning calorimetry , thermal stability , polymer , materials science , polymer chemistry , fire retardant , vinyl polymer , vinyl acetate , amorphous solid , glass transition , inert gas , isothermal process , monomer , organic chemistry , chemistry , copolymer , composite material , physics , thermodynamics
Polysilphenylenesiloxanes containing various amounts of vinyl substituents (ranging from partial (25 %) to complete (100 %)) on the silicon atoms were synthesized. 29 Si NMR spectroscopy revealed that they had a well defined structure, as designed. Unlike the known crystalline poly(tetramethyl‐ p ‐silphenylenesiloxane), all polymers containing vinyl side groups were amorphous and showed low T g s, ranging from −52 to −32 °C (from differential scanning calorimetry (DSC)). Dynamic and isothermal thermogravimetric (TG) analyses indicated that they all possessed a greatly improved thermal stability up to 500 °C, and have ultra‐high residual yields at 1000 °C under both inert and oxidative conditions. Polysilphenylenesiloxanes containing a high percentage of vulcanizable vinyl substituents should be excellent candidates for high‐temperature polymers and have potential applications such as heat‐resistant or flame‐retardant materials. Copyright © 2004 Society of Chemical Industry
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