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spoonyvampirľ³æ (СÓÐÃûÆø)
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SBA-15µÄcomplementary pores
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ÎÄÏ׿´µ½½²SBA-15 complementary pores£¬Õâ¸öcomplementary pore²»ÔõôÀí½âʲôÒâ˼£¬°´ÕÕÎÄÏ×Àí½â¾ÍÊÇÖ¸SBA-15²»¹æÂÉ·Ö²¼µÄ΢¿×ºÍ½é¿×£¬È»ºóÓÖ˵ÕâÖÖ¿×providing various degrees of interconnectivity between adjacent large pore channels. ¶ÔÕâ¸ö²»ÔõôÁ˽⣬ÏëÇë½Ì´ó¼ÒÕâ¸öÊÇʲôÒâ˼¡£Ð»Ð»¡£ ÔÎÄÊÇÕâôһ¶Î»°As a silica framework for the construc- tion of the composite structure with polymers, SBA-15-type mesoporous silica was prepared through the nonionic assembly pathway under acidic conditions.14,15 The choice of the SBA- 15-type silica is based on the following reason. Recent studies have clearly demonstrated that the large uniform ordered main channels of SBA-15 are actually accompanied by disordered micropore/small mesopores (referred to as ¡°complementary pores¡±) in the pore walls, providing various degrees of inter- connectivity between adjacent large pore channels.15-22 Methods to tailor such complementary pores have been reported in detail.15,21,22 It is reasonable that such complementary pores would play a crucial role in the stabilization of the polymer layer deposited onto the siliceous mesopore walls. The polymer chains, interpenetrating with the silica framework through the complementary pores, would form a physically inseparable robust polymer network integrated with the silica framework, increasing significantly the stability of the entire polymeric system. |
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