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Degradation of natural rubber during mill mastication
Author(s) -
Harmon D. J.,
Jacobs H. L.
Publication year - 1966
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1966.070100207
Subject(s) - molar mass distribution , gel permeation chromatography , size exclusion chromatography , degradation (telecommunications) , polymer , molecular mass , natural rubber , materials science , chemical engineering , mill , mastication , mooney viscosity , composite material , chemistry , polymer chemistry , organic chemistry , telecommunications , computer science , engineering , enzyme , medicine , dentistry , copolymer
Changes in the molecular weight distribution of natural rubber, after mill mastication, have been studied by using a Water's gel permeation chromatography. This study indicates that as the polymer is milled the distribution is narrowed primarily through the breaking down of large molecular weight molecules. The peak of the distribution curve shifts to lower and lower molecular weight with increased milling time but it appears to be approaching a limiting molecular weight after 76 min. of milling time. One unexpected result is the development of a secondary hump in the distribution curve at the high molecular weight end. This hump gets larger and moves to lower molecular weight with increasing milling time until 76 min. of milling, at which time it disappears entirely.