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  • 1 Polymer Science Program Material Science & Engineering Department The Pennsylvania State University 16802 University Park PA USA
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The melting behavior of poly(vinylidene chloride) (PVDC) was studied using differential thermal analysis (DTA). Crystals were grown isothermally from 0.1% and 0.02% dilute solutions of the polymer in 1.2-dibromoethane and monobromobenzene. Both ‘solid’ and ‘oil’ samples were used for the DTA experiments. ‘Solid’ samples are defined as dried down crystals and ‘oil’ samples are crystals which have been suspension exchanged in silicone oil without letting them dry out. Thermal curves of ‘solid’ samples are similar to those obtained previously with as-polymerized crystals, that is they show two endotherms. The lower temperature peak corresponds to the melting of lamellae as formed. The upper peak at around 200°C, may be due to the melting of crystals which have reorganized during heating. Thermal curves of ‘oil’ samples show two extra small peaks in addition to those of the ‘solid’ samples. From the results of annealing and degradation experiments, these two peaks may correspond to a small portion of the crystals which have been partially degraded to form double bonds and thus possess lower melting points. An alternative explanation is that there is an as yet unreported second crystal form of PVDC.

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