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Kinetics of ultrasonic and transient elongational flow degradation: a comparative study

โœ Scribed by Tuan Q. Nguyen; Qi Z. Liang; Henning-H. Kausch

Publisher
Elsevier Science
Year
1997
Tongue
English
Weight
927 KB
Volume
38
Category
Article
ISSN
0032-3861

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โœฆ Synopsis

The kinetics of ultrasonic degradation has been investigated for dilute polystyrene solutions in decalin. The increase in the scission rate constant (K) with initial molecular chain length was systematically investigated over 2 decades of molecular weight by using narrow polymer fractions with M = 50 x 103-6 19

8.5 x 10 Da. An empirical relation of the form K ~ (M -Mlim) " , with Mli m ---~ 30000, was found for 50 ร— 103 < M < 2.2 x l0 p. The rate constant becomes independent from M at higher molecular weight. This complex behaviour is rationalized by establishing a parallelism between transient elongational flow and ultrasonic degradation.

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