Journal
POLYMER
Volume 44, Issue 11, Pages 3327-3332Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(03)00185-X
Keywords
shear modulation force microscopy; mechanical properties; cross-linked elastomer
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Brominated poly(isobutylene-co-4-methylstyrene) (BIMS) is a synthetic terpolymer which can be stoichiometrically cross-linked by N,N'-dicinnamylidene-1,6-hexanediamine (DIAK). The degree of cross-links on bulk samples was determined by measuring the low frequency shear modulus with parallel plate method. The surface modulus of the same samples was measured using a new method, shear modulation force microscopy (SMFM). The moduli of the bulk sample and the surface were found to have the same scaling with the cross-link density, and good agreement with rubber elasticity theory was obtained in both cases. The SMFM was then used to monitor the cross-linking process, as a function of DIAK concentration and curing time, in thin films where standard theological methods cannot be applied. The results show that in all cases the cross-linking reaction at the surface reaches saturation in less than 10 min as compared to at least I h in the bulk samples. (C) 2003 Elsevier Science Ltd. All rights reserved.
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