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Quantitative aspects of chain extension of telechelics

Authors:	Béla Iván Joseph P Kennedy

Affiliation:	(1) Institute of Polymer Science, University of Akron, 44325 Akron, Ohio, USA;(2) Present address: Central Research Institute for Chemistry of the Hungarian Academy of Science, POB 17, 1525 Budapest, Hungary

Abstract:	Summary Quantitative aspects of chain extension of telechelics have been studied. Molecular weight independent characteristic terms were defined and simple expressions were derived for number average extension, $\bar E_n = \bar F_n /(2 - \bar F_n )$ , and number average degree of extension, $\overline {DE} _n = 2/(2 - \bar F_n )$ , as a function of number average functionality (¯F_n) of telechelic prepolymers. Analysis of these expressions indicate that _n and ¯DE_n are enormously sensitive to insignificant changes in ¯F_n close to ideal ¯F_n = 2.0. Molecular weight of the extended polymer (¯M_r) has also been calculated considering ¯F_n, number average molecular weight of the prepolymer (¯M_n), and molecular weight of the extender (M_e).

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