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The suggestion that composites with good bonding between fibres and matrix have a faster stress relaxation rate than composites with poor bonding between fibres and matrix is supported here by measurements on natural rubber filled with untreated cellulose fibres, allyl acrylate grafted cellulose fibres and allyl methacrylate grafted cellulose fibres.
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Flink et al. (1990) studied this question.
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