The hydrosilylation cure of polyisobutene
The hydrosilylation cure of polyisobutene
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聚异丁烯的氢化硅烷化固化
DOI：
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发表时间：
1985
期刊：
影响因子：
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通讯作者：
J. Saam
中科院分区：
文献类型：
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作者：
C. Macosko;J. Saam
具有不饱和链端的液态聚异丁烯低聚物与HMe2SiOMe2SiOMe2SiH或Si(OMe2SiH)4发生硅氢化反应，得到更高分子量的聚合物或弹性体。一个主要的副反应消耗SiH在所得聚合物中产生再分布的硅氧烷和气态硅烷和硅氧烷作为副产物。由于末端双键移到内部位置，第二副反应导致低聚物的反应性丧失。如果考虑副反应，则可以从文献中报道的聚异丁烯的>SiH, >C=CHf2的转化和链缠结浓度定量预测分子量，凝胶点和模量。
SummaryA liquid polyisobutene oligomer with unsaturated chain ends undergoes hydrosilylation with HMe2SiOMe2SiOMe2SiH or Si(OMe2SiH)4 to give higher molecular weight polymers or elastomers. A major side reaction consumes SiH to give redistributed siloxane in the resulting polymers and gaseous silanes and siloxanes as by-products. A second side reaction results in loss of reactivity in the oligomer due to a shift of the terminal double bond to an internal position. If the side reactions are taken into account, it is possible to forecast quantitatively molecular weight, gel point and modulus from the conversions of >SiH, >C=CHf2 and the chain entanglement concentration reported for polyisobutene in the literature.