142 Advances in Polymer Science Editorial Board: A. Abe. A.-C ...

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44 B. Charleux, R. Faust Scheme 8 3.1.2.4 Poly(styrene) and poly(a-methylstyrene) Branches EPDM graft terpolymers with PS or poly(a-MeS) branches were prepared from chlorinated commercial EPDM polymer (7.7% 5-ethylidene-2-norbornene as diene, M n=50,000 g mol –1 ) in conjunction with Et 2AlCl, using the “grafting from” technique [66]. Grafting could only be achieved in the presence of 10–20% polar solvent, e.g., CH 3 Cl or CH 2 Cl 2 ; in pure heptane no graft copolymer could be isolated. The grafting reaction was carried out at –30 °C, below this temperature the EPDM polymer was not soluble in the mixed heptane/polar solvent used. The grafting efficiencies were determined by selective solvent extraction and found to be quite low, in the range of 10–20%. The tensile strength and ultimate elongation were also determined and found to be quite low when the amount of PS was 50 wt%, although at the expense of the elastomeric properties (increased modulus and decreased ultimate elongation). 3.2 “Grafting Onto” Technique In the “grafting onto” technique, the macromolecular branches are linked to the main chain by specific reaction between their a or w end group and reactive functional groups in the backbone.
Synthesis of Branched Polymers by Cationic Polymerization 45 3.2.1 Synthesis of the Backbone by Cationic Polymerization 3.2.1.1 Poly(vinyl ether) Backbone Graft copolymers with poly(vinyl ether) backbone and polystyrene or polybutadiene branches were synthesized starting from poly(CEVE) prepared by living cationic polymerization [67]. Typically, the cationic polymerization was performed in toluene at low temperature and was initiated by the HCl adduct of the monomer in the presence of ZnCl 2 . Polymers with controlled length (DP n =6–56) and narrow MWD were obtained (M w /M n
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Author Index Volumes 101-142 Author
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Subject Index Addition-fragmentatio
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Subject Index 241 Microphases 11z,
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