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Title: Radiation Induced Graft Copolymerization of Methyl Methacrylate on Natural and Modified Wool: Part IV-Mechanical Properties
Authors: Varma, D S
Sadhir, R K
Issue Date: Dec-1979
Publisher: NISCAIR-CSIR, India
Abstract: The mechanical properties of the graft copolymers of natural and chemically modified wool and methyl methacrylate in air and water were investigated. The average diameter of the wool fibres showed a gradual increase with increase in the degree of grafting. The general shape of the load-elongation curves in air and water remained intact after chemical modification and grafting, with the exception of reduced wool. With the grafting of a rigid polymer (PMMA), the breaking load increased, breaking elongation decreased and slopes in Hookean, yield and post-yield regions increased. In reduced and grafted wool fibres, the post-yield regions disappeared due to thiol-disulphide interchange reaction. In general, the strength of natural, chemically modified and grafted fibres in water was lower than the corresponding dry strength, whereas the breaking elongation in water was higher than that in dry state. Medullated fibres were stronger than the pure fibres, Hookean slope was more steep and yield slope was also more. Bulk resilience and elastic recovery values were reduced after grafting.
Page(s): 121-132
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.04(4) [December 1979]

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