Thiol-Terminated Polyisobutylene: Synthesis, Characterization, and Derivatization

Document Type

Article

Publication Date

12-1-2010

Department

Polymers and High Performance Materials

Abstract

Thiol-terminated polyisobutylene (alpha,omega-PIB-SH) was synthesized from thiourea and alpha,omega-bromine-terminated PIB in a three-step, one-pot procedure, using a cosolvent system of 1:1 (v:v) heptane: dimethylformamide. The initial alkylisothiouronium salt was produced at 90 degrees C. Aqueous base hydrolysis at 110 degrees C resulted in thiolate chain ends, which were re-acidified to form telechelic PIB-SH. (1)H and (13)C NMR confirmed thiol functionality and complete terminal halogen conversion. Thiol-based "click'' reactions were used to demonstrate PIB-SH utility. Alkyne-terminated PIB was synthesized by a phosphine-catalyzed thiol-ene Michael addition with propargyl acrylate. Reaction of this product with 6-mercaptohexanol produced tetrahydroxy-functional PIB by a sequential thiol-ene/thiol-yne procedure. (1)H NMR confirmed the structures of both products. PIB-SH was reacted with isocyanates in the presence of base to produce polythiourethanes. A model reaction used phenyl isocyanate in THF with catalytic triethylamine. Similar conditions were used to produce PIB-based thiourethanes with and without a small-molecule chain extender. Increased molecular weights and thiol group conversion were observed with GPC and (1)H NMR, respectively. (C) 2010 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 48: 5505-5513, 2010

Publication Title

Journal of Polymer Science Part A-Polymer Chemistry

Volume

48

Issue

23

First Page

5505

Last Page

5513

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