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Characterization by light scattering of simultaneous polymer chain scission and cross-linking processes

✍ Scribed by Zbigniew Turzyński; Konrad Witkowski; Leszek Woliński; Jerzy Szafko

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
644 KB
Volume
25
Category
Article
ISSN
0014-3057

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✦ Synopsis

The results of investigations on the changes in molecular parameters, viz. the average molecular weights, ~n, M~ and M_,; the poly-dispersities Mw/~'n and A~z/~; and the translational diffusion coefficient, Do_-, are presented for a polymer sample undergoing simultaneous chain scission and cross-linking. The calculations were carried out within the framework of the model of Saito and Inokuti. The values of Do_. were calculated by the'use of the cascade substitution technique. The results of calculations were compared with the experimental results obtained by the light scattering method for polystyrene samples exposed to u.v. radiation with wavelength >/270 nm in degassed solutions containing CCI 4 and CHCI3. Analysis of the results leads to conclusions about the usefulness of the measurement of individual molecular parameters for the detection and characterization of simultaneous chain scission and cross-linking.

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