Synthesis and characterization of novel octa-arm star-block thermoplastic elastomers consisting of poly (p-chlorostyrene-b-isobutylene) arms radiating from a calix[8]arene core |
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Authors: | Sunny Jacob Joseph P Kennedy |
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Affiliation: | (1) The Maurice Morton Institute of Polymer Science, The University of Akron, Akron, OH 44325-3909, USA, US |
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Abstract: | The synthesis and characterization of novel octa-arm star-blocks consisting of poly(p-chlorostyrene-b-isobutylene) (PpClSt-b-PIB) arms radiating from a calix8]arene (C8) core are described. The synthesis was accomplished by living isobutylene (IB)
polymerization induced by a novel octafunctional calix8]arene derived initiator 1, followed by addition and living polymerization of p-chlorostyrene (pClSt). This sequential block copolymerization method allowed for precise molecular weight control of both polymeric blocks
and thus gave rise to star-block thermoplastic elastomers (TPE) with an outstanding combination of mechanical and thermal
properties, i.e., high tensile strengths (22 – 27 MPa) and elongations (∼500 %). Differential scanning calorimetry (DSC) indicated
microphase separation into glassy PpClSt (Tg= 129°C) and rubbery PIB (Tg=−66°C) domains, and transmission electron microscopy (TEM) indicated that the PpClSt domains are dispersed in the PIB matrix.
Received: 1 April 1998/Revised version: 1 June 1998/Accepted: 2 June 1998 |
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