Star polymers having a well-defined siloxane core and multiple polyisobutylene arms and a method for the synthesis thereof
First Claim
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1. A star polymer comprising:
- a core component selected from the group consisting of siloxanes containing at least two Si--H groups; and
a plurality of arms attached to said core component and selected from the group consisting of olefin-terminated polyisobutylenes.
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Abstract
The synthesis and characterization of novel multi-arm star polymers comprising polyisobutylene arms connected to a well-defined, siloxane core are described. The synthesis has been achieved by hydrosilating olefin-capped (e.g., allyl- or isopropenyl-terminated) polyisobutylene with siloxanes carrying a plurality of Si--H groups.
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Citations
16 Claims
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1. A star polymer comprising:
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a core component selected from the group consisting of siloxanes containing at least two Si--H groups; and a plurality of arms attached to said core component and selected from the group consisting of olefin-terminated polyisobutylenes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A star polymer comprising:
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a core, wherein said core includes a plurality of siloxane groups; and a plurality of polyisobutylene arms attached to said core. - View Dependent Claims (10, 11)
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12. A method for synthesizing a star polymer containing a well-defined, siloxane core and a plurality of olefin-terminated polyisobutylene arms emanating from said siloxane core, comprising the step of:
linking said polyisobutylene arms to said core by hydrosilation. - View Dependent Claims (13, 14, 15, 16)
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