Poly vinyl ether Branches

Aldol group transfer polymerization of ferf-butyldimethylsilyl vinyl ether [62] was initiated by pendant aldehyde functions incorporated along a poly(methyl methacrylate) (PMMA) backbone [63]. This backbone was a random copolymer prepared by group transfer polymerization of methyl methacrylate (MMA) and acetal protected 5-methacryloxy valeraldehyde. After deprotection of the aldehyde initiating group, polymerization proceeded by activation with zinc halide in THF at room temperature. The reaction led to a graft copolymer with PMMA backbone and poly(silyl vinyl ether) or, upon hydrolysis of the ferf-butyldimethylsilyl groups, poly(vinyl alcohol) branches. 

The heterografted block copolymer brushes consisting of PS and poly(methyl vinyl ether) branches attached to a diblock backbone are accessible via the combination of grafting onto ... 

As shown in Table 3, the glass-transition temperatures of the amorphous straight-chain alkyl vinyl ether homopolymers decrease with increasing length of the side chain. Also, the melting points of the semicrystalline poly(alkyl vinyl ether)s increase with increasing side-chain branching. 

The advantage of the system arises from the fact that, since the poly(chloroethyl vinyl ether) (PCEVE) backbone and PSt grafts can be prepared by both living cationic and anionic polymerization, it is possible to synthesize graft copolymers that possess both a backbone with controlled dimensions and an adjustable number of branches of precise length and narrow molecular weight distribution. 

Materials and Methods. The following polyelectrolytes were used copolymers of maleic acid (MA) with methyl vinyl ether (MVE), copoly(MA, MVE), and with styrene (St), copoly(MA, St), and poly(iminoethylene) (PEI, branching type). 

In the macromonomer approach, polymeric chains (of monomer Mi) end-functionalized with a vinyl group are homopolymerized (with Mi) or copolymerized (with M2) to produce branched (co)polymers. Thus, poly(ethylene glycol) methyl ether methacrylate (CJien et al., 2003) and poly(dimethyl siloxane) methacrylate (Shinoda and Matyjaszewski, 2001) have been homo- or copolymerized to yield graft (co) polymers with the corresponding pendant chain. 

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