By Jaques Roovers
The 2 better half volumes of Advances in Polymer technological know-how numbers 142 and 143 take care of glossy elements of long-chain branching in man made polymers. The long-chain structure is now more and more used as a layout software for targetted polymer houses. the factitious points hide branching through cationic polymerization, uneven branching, poly(macromonomers), dendrimer-polymer hybrids and hyperbranched polymers. 3 contributions hide idea and simulation of branching, answer homes, and soften stream of branched polymers, respectively.
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Additional info for Branched Polymer I
1 Poly(vinyl ether) Backbone Graft copolymers with poly(vinyl ether) backbone and poly(2-ethyloxazoline) branches were reported  where the backbone, a random copolymer of poly(EVE) and poly(CEVE), was prepared by conventional cationic polymerization using aluminium hydrogen sulfate as an initiator in pentane at 0 °C. After quenching the copolymer with methanol, quantitative polymerization of 2-ethyloxazoline was performed using the pendant chloroethyl sites as initiators in the presence of sodium iodide in chlorobenzene at 115 °C.
The concentration of the nucleophilic functions was similar to that of the chain ends. In both cases, SEC analysis of the final products showed the complete shift of the low MW peak Synthesis of Branched Polymers by Cationic Polymerization 33 Scheme 5 corresponding to the linear chains towards higher MWs. 1). Based on these SEC analyses, the overall yields of the coupled products were above 95%. The structure was verified using 1H NMR analysis which evidenced quantitative reaction of each enol ether group for both coupling agents.
The block copolymers were prepared by living cationic sequential copolymerization of a hydrophobic vinyl ether (IBVE or 2-chloroethyl vinyl ether, CEVE) and a hydrophobic precursor to a hydrophilic vinyl ether (AcOVE or 2[(tert-butyldimethylsilyl)oxy]ethyl vinyl ether, SiVE). Polymerization was initiated by the HCl/ZnCl2 system in CH2Cl2 at –15 °C and four different copolymers were prepared by changing either the comonomers or the polymerization sequence. Coupling reaction was performed and it was shown that the yield depends on the structure of the copolymer as well as on the monomer sequence in the arms.