交联剂

Abstract\n\t\t\t\t\n\t\t\t\t\tA novel cross-linker octa[(trimethoxysilyl)ethyl]-POSS (OPS) based on a Vinyl-POSS derivative was firstly prepared via hydrosilylation chemistry. The novel POSS cross-linker was applied to hydroxyl terminated polydimethylsiloxane (HPDMS) matrix to prepare a series of novel RTV silicone rubbers. The chemical incorporation of novel POSS cross-linker into PDMS by hydrolytic condensation reaction was verified by attenuated total reflection (ATR) infrared spectroscopy.

交联剂是制备聚合物膜的重要因素，它不仅对成膜过程有重要影响，而且对膜结构和分离性能也有重要影响。然而，紫外交联膜用于有机物渗透汽化的研究很少。本工作中交联剂3 -甲基丙烯酰氧基丙基甲基二甲氧基硅烷( KH571 )对( 1 )紫外交联动力学的影响采用实时红外光谱和光流变仪表征，( 2 )通过交联密度表征膜结构，( 3 )通过乙醇渗透汽化评价分离性能。而且，传统的聚二甲基硅氧烷( PDMS )被聚二甲基硅氧烷-聚[ ( 3，3，3 -三氟丙基)甲基硅氧烷] ( PDMS-PTFPMS )嵌段共聚物所取代，其中较强的C-F键有助于增强膜的疏水性。结果表明，所有涂层溶液体系均采用超快速成膜工艺( 30 ~ 50 s )，分离性能优异，其中乙醇分离因子11.3，总通量1149 g m-2 h-1，60℃下5 wt %乙醇/水溶液渗透汽化回收。