Blockcopolymers - Polyelectrolytes - Biodegradation by Marinos Pitsikalis, Stergios Pispas (auth.), V.

By Marinos Pitsikalis, Stergios Pispas (auth.), V. Bellon-Maurel, A. Calmon-Decriaud, V. Chandrasekhar, N. Hadjichristidis, J. W. Mays, S. Pispas, M. Pitsikalis, F. Silvestre (eds.)

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The synthesis was reported by Hadjichristidis and Roovers [39] and more recently by A1-Jarrah et al. [78]. It was found that the lithiation reaction was best controlled using high vacuum line conditions. In all cases the formation of homopolystyrene was observed either due to residual s-BuLl or to a side reaction which consumes part of the s-BuLl to form a lithium compound which can act as initiator for the polymerization of styrene. The grafting efficiency was increased by the addition of -~5% THF, which breaks the association of the growing PS chains.

The synthesis was reported by Hadjichristidis and Roovers [39] and more recently by A1-Jarrah et al. [78]. It was found that the lithiation reaction was best controlled using high vacuum line conditions. In all cases the formation of homopolystyrene was observed either due to residual s-BuLl or to a side reaction which consumes part of the s-BuLl to form a lithium compound which can act as initiator for the polymerization of styrene. The grafting efficiency was increased by the addition of -~5% THF, which breaks the association of the growing PS chains.

This method for the preparation of allyl-terminated PDMS is preferred over the method concerning the termination of living PDMS with allylchloride because the weak-Si-O-C-bonds in -Si-O-CH2-CH=CH2 are sensitive to moisture, alkali and acid. Another monomer frequently used is methyl methacrylate. Functional termination is the most common method for the preparation of macromonomers. MMA macromonomers with methacryloyl end groups were prepared [113] according to the following reaction series (Scheme 40).

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