Authors Kurian, P. ; Zschoche, St. ; Kennedy, J.P.
Title Synthesis and Characterization of Novel Amphiphilic Block Copolymers: Di-, Tri-, Multi-, and Star Blocks of PEG and PIB
Date 29.09.2000
Number 9377
Abstract A simple but efficient strategy has been developed for the synthesis of novel di-, tri-, multi-, and star-block copolymers comprising poly(ethylene glycol) (PEG) and polyisobutylene (PIB) blocks. The synthesis principle involves the coupling of appropriately terminally functionalized PEG and PIB sequences, specifically the hydrosilation of mono-, di-, and tetra-allyl-telechelic PEGs (PEG-allyl, allyl-PEG-allyl, and C(-PEG-allyl)<SUB>4</SUB> by mono- and di-Si(CH<SUB>3</SUB>)<SUB>2</SUB>H telechelic PIBs (PIB-SiH and HiS-PIB-SiH). Representative block copolymers, for example, PEG-PIB, PIB-PEG-PIB, (-PIB-PEG-)<SUB>n</SUB>, and C(-PEG-PIB)<SUB>4</SUB> have been assembled and their structures determined by <SUP>1</SUP>H and <SUP>13</SUP>C NMR spectroscopy. The bulk and surface morphology of select triblocks have been investigated by DSC and AFM and the findings interpreted in terms of phase-separated PEG and PIB microdomains. The swelling behavior in water of various block copolymers also has been studied. Block copolymers containing 50-70 wt % PIB produce hydrogels, the integrity of which is maintained by physical crosslinks by PIB segments. &copy; 2000 John Wiley &amp; Sons, Inc. J Polym Sci A: Polym Chem 38: 3200-3209, 2000
Publisher Journal of Polymer Science: Part A: Polymer Chemistry
Citation Journal of Polymer Science: Part A: Polymer Chemistry 38 (2000) 3200-3209

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