Crosslinking on ageing of elastomers - III. A new method for evaluation of crosslinking based on density measurements

被引:18
作者
Baba, M [1 ]
Lacoste, J [1 ]
Gardette, JL [1 ]
机构
[1] Univ Blaise Pascal, Photochim Mol & Macromol Lab, CNRS, UMR 6560,ENS Chim Clermont Ferrand, F-63177 Aubiere, France
关键词
D O I
10.1016/S0141-3910(99)00031-2
中图分类号
O63 [高分子化学(高聚物)];
学科分类号
070305 ; 080501 ; 081704 ;
摘要
The crosslinking of EPDM has been studied by measuring the density of the solution in cyclohexane of the soluble part of samples at various extents of crosslinking. All samples had the same weight and were extracted by equal volumes of solvent. Two series of samples have been studied: chemically crosslinked (by dicumyl peroxide) and photooxidized. In the case of the chemically crosslinked samples, the variations of the density of the solution with the curing time show that the density tends towards that of the solvent, with kinetics which are a function of the peroxide content. In the case of the photooxidized samples, the results show that after a first period crosslinking is predominant leading to a decrease of the density of the solution. In a second period, chain-scissions lake place and a notable increase of the density of the solution is observed. (C) 1999 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:421 / 424
页数:4
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