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Higher order star polymers having multiple polyisobutylene arms radiating from a condensed core of siloxanes and a method for the synthesis thereof
Higher order star polymers having multiple polyisobutylene arms radiating from a condensed core of siloxanes and a method for the synthesis thereof
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机译:具有多个聚异丁烯臂的高阶星形聚合物,该多异丁烯臂从硅氧烷的稠密核辐射而来,及其合成方法
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摘要
The synthesis and characterization of novel higher order, multi- arm star polymers comprising polyisobutylene arms connected to condensed cyclosiloxane cores are described. The synthesis has been achieved by hydrosilating olefin-capped (e.g., allyl- or isopropenyl- terminated) polyisobutylene with hydrogencyclosiloxanes carrying a plurality of Si-- H groups and simultaneously and competitively converting SiH functions, in the presence of moisture, to Si--OH groups to rapidly self-condense or react with SiH groups to form coupled cyclosiloxane cores via core- core coupling. Thus, higher order stars having many more arms than first order stars can be formed.
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