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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 17, Number 3
JKCSEZ 17(3)
June 20, 1973 

Mechanical Degradation of Polymers in Dilute Solution (Ⅲ). The Influence of the Mixed Solvents

희박용액에서의 Polymer의 기계적 절단 (제3보). 혼합용매의 영향
Yeong Moo Won

모세관법을 이용하여 여러가지 혼합용매계(dioxane-n-butanol, dioxane-sec-butanol, dioxane-ethyleneglycol, dioxane-kerosene)중에서 polyvinylacetate의 희박용액을 기계적으로 절단하여 그 결과로 얻어진 평균절단속도정수(k) 및 극한중합도(g)를 moleculare dimension이 동일한 조건하에서 비교검토하였다. 그 결과 k보다는 g의 값이 사용하는 solvent의 종류에 따라 크게 영향을 받음을 알았으며 이에 관하여 고찰하였다.

The mechanical degradation of poly (-vinylacetate) in several mixed solvents (dioxane-n-butanol, dioxane-sec-butanol, dioxane-ethyleneglycol, dioxane-kerosene.) was studied using the capillary flow method. The velocity constant of scission reaction (k) and the limited degree of polymerization (g) were compared at the same value of [η], which is considered as the parameter of molecular dimension of polymers in solution. As result, (k) did not change much, even if the species and the volume fraction of poor (non-) solvents changed, while the value of (g) changed according to the species of poor solvents and the value of [η]. From the facts described above, It follows that the limited degree of polymerization (g) were affected by the composition and distribution of mixed solvent molecules around the polymer chain, and the value of α (at [η] = KMα) in the polymer solution.

207 - 212
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