By Jaques Roovers
The 2 significant other volumes of Advances in Polymer technology numbers 142 and 143 take care of smooth elements of long-chain branching in artificial polymers. The long-chain structure is now more and more used as a layout software for targetted polymer homes. the artificial elements disguise branching via cationic polymerization, uneven branching, poly(macromonomers), dendrimer-polymer hybrids and hyperbranched polymers. 3 contributions hide conception and simulation of branching, resolution homes, and soften circulate of branched polymers, respectively.
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Extra resources for Branched Polymer I
The apparent yield was 85–90% and steric hindrance was assumed to be responsible for incomplete reaction. Nevertheless, it could be concluded that the multifunctional coupling agents based on silyl enol ether functions were superior to those based on malonate ions previously described in the sense that they could lead to three and four arm star poly(IBVE) with short arms in very high yield. Using the tetrafunctional coupling agent 25, end-functionalized four arm poly(IBVE)s were synthesized .
96). A macromonomer made of a block copolymer of p-MeS and b-pinene was also prepared by sequential living cationic polymerization of both monomers under the same experimental conditions. The first block had 12 p-MeS units and the second had 11 b-pinene units as evaluated by 1H NMR spectroscopy. 020 mol l–1. MMA was completely converted in 18 h and the macromonomers conversion reached more than 70% as determined by 1H NMR. Incomplete conversion was explained by steric hindrance. Free-radical copolymerization resulted in high MW graft copolymers with PMMA backbone and relatively rigid, nonpolar poly(b-pinene) branches.
97) were reported. 4 Poly(a-methylstyrene) A similar procedure was also used for the synthesis of methacrylate functional poly(a-MeS) . Thus, 31 was used in conjunction with SnBr4 in CH2Cl2 at – 78 °C, to obtain the macromonomer with Mns substantially (~50%) higher than the theoretical value. This was probably due to the formation of terminated low MW oligomers with indanyl end group structure. The eliminated proton was as- Synthesis of Branched Polymers by Cationic Polymerization 51 sumed to remain unreactive and did not initiate new polymer chains, since the functionality of the polymer was found to be close to unity.
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