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- W2332496497 abstract "The distribution of crystallinity around the axis of elongation in a rubberlike polymer stretched above its normal melting temperature is calculated. Although most of the basic assumptions are identical with those adopted by Flory in 1947, the model of rubber elasticity proposed by Ronca and Allegra in 1975 is explicitly adopted, and the assumption of parallelism among the crystallites is avoided. According to some experimental observations, only the extended chain crystallization mechanism is taken into consideration. The incipient crystallization temperature and the equilibrium retractile force are also obtained. The X-ray intensity distribution for the general reflection on a stretched fiber diagram is formally derived as a function of crystallite orientation. Agreement with several experimental data obtained by Cesari, Perego, Zazzetta and Gargani, from crosslinked cis-1,4-polybutadiene may be regarded as satisfactory, considering the simplifying assumptions. According to the theoretical predictions, the crystallites formed at incipient crystallization are quite narrowly aligned around the direction of elongation. Unlike Flory's theory, the present formalism leads to no discontinuity in the derivative of the retractile force vs. the stretch ratio at the incipient crystallization point, in agreement with observation." @default.
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- W2332496497 date "1980-04-01" @default.
- W2332496497 modified "2023-09-23" @default.
- W2332496497 doi "https://doi.org/10.1002/macp.1980.021810518" @default.
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