New PDF release: Template polimerization

By S. Polowinski

ISBN-10: 1895198151

ISBN-13: 9781895198157

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Additional info for Template polimerization

Example text

However, the template mechanism was suggested for polymerizations carried out above 60o C. Polyacrylonitrile, accumulated at the early stages of the reaction, acts as a template to which monomer associates by dipole-dipole interaction. It is illustrated by the formula: In the associates, polymerization occurs according to the zip-propagation mechanism, and auto-acceleration takes place. In the range of temperatures from 10 to 60oC, the system gradually changes from the system dominated by occlusion to the system where template effect determines the kinetic behavior.

Leskano Brito, J. Reimont, and A. N. Gvozdeckii, Vysokomol. , 14, 2462 (1972) with kind permission from Iz. Nauka. change in tacticity of PMA obtained in the presence of PEG was rather small. An increase by about 6% in syndiotacticity was caused by PEG. The authors suggested that in the system examined the role of the template is limited to connecting the template macromolecules with growing chains and creating a surrounding for the growing center, similar to that for concentrated solutions of PEG or low molecular weight analog of the template.

8 MULTIMONOMERS AS TEMPLATES A special type of template polymerization takes place if monomer is connected with a template by covalent bonding. Initiation, propagation, and termination proceed in the close contact with the template. 60-67 One of the methods by which such polymers are obtained is “zipping up”. In general, the method involves making a linear polymer (template) containing appropriately located reactive functional groups and then linking these groups to form the second part of the ladder.

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Template polimerization by S. Polowinski


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