Title of article :
Organic–inorganic networks in foams from high internal phase emulsion polymerizations
Author/Authors :
Tai، نويسنده , , H and Sergienko، نويسنده , , A and Silverstein، نويسنده , , M.S، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2001
Pages :
10
From page :
4473
To page :
4482
Abstract :
Hybrid foams, which combine an inorganic polysilsesquioxane network with an organic polystyrene network, were successfully synthesized using high internal phase emulsions (HIPE). Methacryloxypropyltrimethoxysilane (MPS) was copolymerized radically with styrene (S) and divinylbenzene (DVB) in the organic phase of the emulsion. The hydrolytic condensation of the trimethoxysilyl groups formed an inorganic polysilsesquioxane network, which significantly increased the high temperature modulus and thermal stability of the foam. The hybrid foam had an open-cell structure typical of polymer foams based on HIPE (polyHIPE), with a significantly smaller cell diameter than S/DVB polyHIPEs. In the absence of DVB, there is no crosslinked network to restrict the mobility of MPS and the polysilsesquioxane network is more fully developed. At low MPS contents, the thermal stability of the foams is higher for foams with DVB, reflecting their higher crosslinking density. At high MPS contents, the thermal stability is higher for foams without DVB, reflecting the more fully developed inorganic network.
Keywords :
Hybrid foam , Polysilsesquioxane , High internal phase emulsion (HIPE)
Journal title :
Polymer
Serial Year :
2001
Journal title :
Polymer
Record number :
1714245
Link To Document :
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