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烯丙氧甲基15-冠-5和18-冠-6与甲基二氯硅烷进行硅氢加成,再与端羟基硅油反应,三甲基氯硅烷封端,得到两种冠醚含量适中、结构确定的含冠醚侧基的线型聚甲基硅氧烷.以两种聚合物冠醚为流动载体,采用大块液膜装置,研究了载体和阳离子的种类、成盐阴离子的种类、载体的浓度及盐的浓度对离子迁移的影响,并考察了膜的稳定性. 相似文献
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A new type of selenious polymer, silica-bound polybispropoxyethyl-selenidesilsesquioxane,and its platinum complex were synthesized from bis-allyloxyethyl selenide via hydrosily-lation with triethoxysilane, followed by immobilized on fumed silica, and then reactingwith potassium chloroplatinite under nitrogen atmosphere in acetone. It was found thatthe platinum complex can catalyze the hydrosilylation of olefins with triethoxysilane effec-tively The effects of the nature of the substrate, the amount of complex used, and thereaction temperature on the catalytic activity were investigated. 相似文献
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Silica-bound mercaptoselenaether-containing silsesquioxane and its plat-inum or rhodium complex were synthesized from γ-(2,3-epithiopropyl) propyltrimethoxysi-lane via ring-opening reaction with bis(2-hydroxyethyl) sclenide, followed by hydrolysisand immobilization on fumed silica, and then reacting with potassium chloroplatinite orrhodium chloride in acetone under nitrogen atmosphere. It was found that two noble metalcomplexes can catalyze the hydrosilylation of olefins with triethoxysilane effectively. Theinfluences of temperature, the amount of complex used, the nature of olefin on catalyticactivity were investigated. 相似文献
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三苯基膦配位铂络合物催化烷氧基硅烷与α-烯烃的硅氢化反应的研究 总被引:2,自引:0,他引:2
在无溶剂和有氧气下,Pt(PPh_3)_4或 Pt(O_2)(PPh_3)_2对α-烯烃与三乙氧基硅烷的硅氢化反应具有很高催化活性,但在惰性气氛下活性明显下降。在上述反应中这两种铂络合物的催化行为十分相似,Pt(PPh_3)_4的催化作用可能是在反应过程中转变为Pt(O_2)(PPh_3)_2而实现的。反应温度60℃是较合适的。在90℃时催化剂失活,反应速度急剧降低;在30℃,反应在前期阶段进行很慢,有较长的诱导期。 相似文献
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为使我系高分子专业本科毕业生和硕士生适应我国社会主义现代化建设和改革、开放的需要,我系高分子合成教学实验室在系和高分子教研室的支持下,对四年级本科生和部分硕士研究生的“高分子合成实验”以及另一部分硕士研究生的“教学实践”等课程进行了一些改革。经过两年多的探索,这些改革收到了良好的效果。 相似文献
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