The grafting of methacrylic acid on to nylon 6 film has been investigated; in this work, graft polymerisation was initiated by irradiation in the presence of benzophenone as photosensitiser. Little homopolymer is produced under any of the conditions investigated. Because of the rapid decomposition of the photosensitiser, graft polymerisation is efficient only at low concentrations of monomer; at high concentrations, the reaction takes onthe form of a ‘dead‐end’ polymerisation. The initial modulus of the nylon film is increased by the grafted polymer, but there is little change in tensile strength. The moisture regain of the nylon is increased on conversion of the grafted polyacid to the sodium salt.
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Howard et al. (1969) studied this question.
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