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Grafting of functionalized silica particles with poly(acrylic acid)

机译：用聚丙烯酸接枝官能化二氧化硅颗粒

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摘要

Two different methods to graft silica particles with poly(acrylic acid) (PAA) were studied. In the first method PAA was reacted with 1,1'-carbonyldiimidazole to give functionalized PAA. The resulting activated carbonyl group reacted easily with 3-aminopropyl-functionalized silica at low temperatures. In the second method 3-glycidoxypropyl-functionalized silica particles were reacted directly with PAA by using magnesium chloride as a catalyst. Different molecular weights of PAAs were used in order to investigate the effect of molecular weight on grafting yields in both methods. The grafting yields were determined with thermogravimetric analysis (TGA). All products were also investigated with IR. The results showed that the yields of reactions performed at ambient temperature by using 1,1'-carbonyldiimidazole-functionalized PAA were the same as with a direct reaction of unfunctio-nalized PAA and 3-aminopropyl-functionalized silica performed at 153℃. Also in reactions between 3-glycidoxypropyl-functionalized silica and PAA the yields were satisfactory.
机译：研究了用聚丙烯酸（PAA）接枝二氧化硅颗粒的两种不同方法。在第一种方法中，PAA与1,1'-羰基二咪唑反应，得到官能化的PAA。所得的活化的羰基在低温下容易与3-氨基丙基官能化的二氧化硅反应。在第二种方法中，通过使用氯化镁作为催化剂，使3-环氧丙氧基丙基官能化的二氧化硅颗粒直接与PAA反应。为了研究两种方法中分子量对接枝产率的影响，使用了不同分子量的PAA。接枝产率通过热重分析（TGA）确定。还用IR对所有产品进行了研究。结果表明，在环境温度下使用1,1'-羰基二咪唑官能化的PAA进行反应的产率与未官能化的PAA和3-氨基丙基官能化的二氧化硅在153℃下进行的直接反应相同。在3-环氧丙氧基丙基官能化的二氧化硅和PAA之间的反应中，收率也令人满意。

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