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Some comments on the melting and recrystallization of polyoxymethylene by high-speed and StepScan differential scanning calorimetry

机译：高速和StepScan差示扫描量热法对聚甲醛的熔融和重结晶的评论

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摘要

Melting process of polyoxymethylene (POM) was studied by both high-speed differential scanning calorimetry (DSC) and StepScan DSC.It has been observed that for high scan rate (hundreds degrees per minute) side effects as e.g.recrystallization are eliminated.POM macromolecules do not undergo reorganization and a complete melting occurs.The influence of heating rate on the shape of melting peak has been discussed in context of meta-stability of polymeric crystal structures.Low heating rate facilitates recrystallization,due to molecular nucleation.Molecular nucleation exists when more defected or composed of shorter chains crystallites melt in the vicinity of high-melting polymer crystals,consisting of longer chains.These crystallites undergo nucleation and recrystallization on the existing unmelted crystals.The recrystallization process can be observed by means of modulated temperature differential scanning calorimetry,as it has been shown in this study.
机译：通过高速差示扫描量热法（DSC）和StepScan DSC研究了聚甲醛（POM）的熔融过程，发现对于高扫描速率（每分钟百度）消除了例如重结晶的副作用。聚合物晶体结构的亚稳性已经讨论了加热速率对熔化峰形状的影响。低加热速率由于分子成核而促进了重结晶。有缺陷或由较短链组成的微晶在高熔点聚合物晶体附近熔化，由较长链组成。这些微晶在现有的未熔融晶体上进行成核和重结晶。可通过调制温度差示扫描量热法观察重结晶过程，如本研究所示。

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