γ-Ray polymerization of two diacetylenes (3BCMU and 4BCMU) was studied, in particular at low doses below 5000 rad. Reactivity is very high, leading to large polymerization G values of 2.4 × 10 4 and 6.9 × 10 4, respectively. Molecular weight distributions were measured for 4BCMU, leading to M n ≈ 2.6 × 10 6 (chain length 2.5 μm) with small dispersion. A large chain initiation G value, G i = 14, is derived.
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Spagnoli et al. (1996) studied this question.
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