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首页> 外文期刊>Journal of Applied Polymer Science >Catalysis of the Crosslinking Reactions of Ethylene Vinyl Silane Copolymers Using Carboxylic Acids and DBTDL
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Catalysis of the Crosslinking Reactions of Ethylene Vinyl Silane Copolymers Using Carboxylic Acids and DBTDL

机译：羧酸和DBTDL催化乙烯-乙烯基硅烷共聚物的交联反应

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摘要

The cataltic effects on the crosslinking behavior of poly (ethylene-co-vinuyl-trimethoxysilane) were investigated for three different catalysts: the commonly used tin-based compound dibutyltin dilaurate (DBTDL), a low molecular weight carboxylic acid (stearic acid), and a polymer-bound carboxylic acid [ethylene-acrylic acid (EAA) copolyer]. Film sampes were prepared and stored in hot water at 90 deg C and analyses were preformed with a decalin extration method as well as with FTIR techniques. The DBTDL was found to strongly catalyze the first step of the crosslinking reaction, that is, the hydrolysis. Concerning the catalytic activity of the carboxylic acids, the low molecular weight stearic acid has been shown to be a much more effective catalyst than is the polymer-bound carboxylic acid (EAA). Estimations on a molar basis give approximately a factor of five between them in efficiency. The carboxylic acids probably catalyze the hydrolysis as well as the condensation step of the crosslinking. Comparing stearic acid with DBTDL shows that the latter still is the more effective catalyst on a molar basis. Different possible catalytic mechanisms for the DBTDL and acid compounds are proposed based on the Bronsted and Lewis acids' concepts.
机译：研究了三种不同催化剂对聚（乙烯-共-乙烯基-三甲氧基硅烷）交联行为的催化作用：常用的锡基化合物二月桂酸二丁基锡（DBTDL），低分子量羧酸（硬脂酸）和与聚合物结合的羧酸[乙烯-丙烯酸（EAA）共聚物]。制备膜样品并将其存储在90摄氏度的热水中，并使用十氢化萘萃取法和FTIR技术进行分析。发现DBTDL强烈催化交联反应的第一步，即水解。关于羧酸的催化活性，低分子量的硬脂酸已显示出比与聚合物结合的羧酸（EAA）更有效的催化剂。以摩尔为基础的估算在效率之间得出大约五分之一。羧酸可能催化交联的水解以及缩合步骤。将硬脂酸与DBTDL进行比较表明，以摩尔计，后者仍然是更有效的催化剂。基于布朗斯台德和路易斯酸的概念，提出了DBTDL和酸化合物的不同可能的催化机理。

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