Randomly branched precursors

Randomly branched precursors any crosslinking system before the gel point can potentially be used as a polymer network precursor provided that... 

The synthesis of comb-like polymers with regular branching (in contrast to random branching) has been performed in the following way 91) A linear polystyrene precursor fitted with carbanionic sites at both ends is reacted first with 1,1-diphenylethylene (to decrease the nucleophilicity of the sites) and then with a calculated amount of triallyloxytriazine to get chain extension. Each triazine residue still carries one allyloxy... 

Calculate the size of an ideal randomly branched polymer with precursor chains made of Aq Kuhn monomers with Kuhn length b—5A. and total -------number A== 10" monomers. Estimate this size for... 

What is the largest possible volume fraction b g(r) of a randomly branched polymer inside its own pervaded volume in the vulcanization of precursor A o-mers below the gel point ... 

Early on, random glycosylation of unprotected disaccharides, involving the nonselec-tive coupling of a fucosyl donor, was used to produce three sub-libraries of a-fucosylated disaccharides in one step (136). Nearly statistical mixtures of all possible trisaccharides were obtained after chromatography. Linear and branched trisaccharide libraries were prepared by the latent-active glycosylation (137, 138). This concept made use of the convenient access to both glycosyl donors and acceptors from common allyl glycoside precursors. 

The synthesis of a miktoarm star copolymer of the type A Bn has been also demonstrated. The synthesis was performed via ATRP using divinylbenzene, as the core cross-liking agent. PEO macroinitiator chains were utilized for the polymerization of divinylbenzene forming a star polymer, with a random nmnber of branches. The above star polymer was used as a multi-fimctional initiator for the polymerization of methacrylate monomers. Therefore, the synthesis of an amphiphilic miktoarm star copolymer was realized [54]. Finally, the hydrolysis of the protected methacrylate block led to the preparation of the desired DHBCs, namely the PEOn-PMAAn stars. SEC analysis of the precursor PEOn-PMMA copolymer revealed a relatively broad molecular weight distribution. Nevertheless, this is a good example for the synthesis of AnBn double hydrophilic star copolymers. 

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