Composites formed by interstitial polymerization of vinyl monomers in polyurethane elastomers: 3. The role of graft copolymerization

The high impact strength of composites prepared by interstitial polymerization of methyl methacrylate (MMA) in polyurethane elastomer gels does not appear to involve graft copolymerization mechanisms for maximum efficiency in contrast with conventional rubber-modified thermoplastics. Chemical studie...

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Bibliographic Details
Published in:Polymer (Guilford) 1974, Vol.15 (1), p.13-18
Main Authors: Allen, G., Bowden, M.J., Lewis, G., Blundell, D.J., Jeffs, G.M.
Format: Article
Language:English
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Summary:The high impact strength of composites prepared by interstitial polymerization of methyl methacrylate (MMA) in polyurethane elastomer gels does not appear to involve graft copolymerization mechanisms for maximum efficiency in contrast with conventional rubber-modified thermoplastics. Chemical studies on ‘model’ systems coupled with solvent extraction measurements on the composite materials indicate that grafting does not take place. These conclusions were substantiated by dynamic mechanical results. Incorporation of poly(1,2-butadiene) into the backbone chain resulted in a marked drop in impact strength and although dynamic mechanical measurements suggest grafting occurs in this system, the lower impact strengths are probably due to the large upward shift in T g of the corresponding elastomer.
ISSN:0032-3861
1873-2291
DOI:10.1016/0032-3861(74)90068-8