Abstract
The Melting and crystallization behavior of 1,2-polybutadiene with 25-% crystallinity were observed by DSC thermograms at various heating and cooling rates. The effects of annealing were observed through melting phenomena of the sample, at temperature from 40 to 95°C.It was found that the specimen annealed for a long time at a fixed temperature had two endothermic peaks in its melting thermogram, one corresponding to the annealing temperature and the other to the melting of the crystal formed at the stage of annealing at room temperature or in the quenching period after the annealing. An analytical equation was proposed for the kinetics of crystallization at constant cooling rate on the bases of Avrami’s equation. The proposed relation appeared to be valid over a wide range of x/x∞ not only for the present sample but also for other crystalline polymers such as isotactic polypropylene. This method enables us to observe crystallization behavior at lower temperature side than that by dilatometry. The characteristics of the kinetics of 1,2-polybutadiene were as follows. The induction time for the crystallization was relatively large and the temperature coefficient of the rate of crystallization was small as compared to those of highly crystalline polymers such as high- and low-density polyethylenes, and isotactic polypropylene.
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Obata, Y., Homma, C. & Tosaki, C. Bulk Properties of Syndiotactic 1,2-Polybutadiene. III. Melting and Crystallization Properties. Polym J 7, 312–319 (1975). https://doi.org/10.1295/polymj.7.312
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DOI: https://doi.org/10.1295/polymj.7.312
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