Effect of Substrate Surface on Polymer Crystallization

2002年6月9日至6月12日，由“现在计划”主办的“聚合物结晶”国际研讨会在三岛召开。我们的研究小组在研讨会上做了2次口头报告和4次海报报告。此外，在2002年7月2-6日在中国青岛举行的国际聚合物物理研讨会上，还发表了一篇海报报告。此外，在国内高分子物理相关会议和研讨会上做了9次海报报告。关于聚合物结晶的各种类型的研究已经在上述会议上进行了介绍，其中一些还在继续。现将今年取得的突出重要成果总结如下：1)发现聚环氧乙烷在碱卤化物上结晶时，形成了扩散限制聚集体（DIA）。这是首次在聚合物结晶过程中发现DLA。扩散是聚合物结晶过程中一个非常重要的因素，阐明扩散在聚合物结晶过程中的作用是本课题研究的主要目标之一。用这种方法实现了典型的扩散现象DLA，证明了扩散是影响聚合物结晶的重要因素。2)非晶态聚-1-丙交酯退火结晶时，低温退火形成β型晶体，高温退火形成a型晶体。此外，β型晶体在略低于熔点的温度下转变为α型晶体。到目前为止，这两种晶体形式之间的关系尚不明确，但在本研究中得到了澄清。高速纺丝的结构形成是工业上的一个重要课题。对其结构发育及其形成机制的研究是纤维科学的一个欠发达领域。与其他小组成员合作，我们负责高速纺丝的聚对苯二甲酸萘酯纤维的电子显微镜和原子力显微镜。高速纺丝纤维的织构表现出与低速纺丝纤维不同的特点。然而，纺丝速度对结构和结构发育方式的影响还有待进一步研究。少

The International Symposium on "Polymer Crystallization", which was sponsored by the Present Project, was held from June 9-June 12, 2002, in Mishima. Our research group gave 2 oral and 4 poster presentations at the Symposium. Further, a poster presentation was given at the International Symposium on Polymer Physics, which was held from July 2-6, 2002, in Quindao, China. In addition, 9 poster presentations were given in domestic meetings and symposiums concerning with polymer physics.Various types of studies on polymer crystallization have been carried and presented at the above meeting, and some of them are continued still. The outstanding and important results in this year are summarized as follows.1)It was found that when poly(ethylene oxide) was crystallized on alkali halides, the diffusion-limited aggregates (DIA) were formed. It is the first case of DLA, which was identified in polymer crystallization. Diffusion is a very important factor of polymer crystallization, and then it is … More one of main targets on the present project to make clear the role of diffusion on polymer crystallization. The typical diffusion phenomenon, DLA, was realized in this way and proves the diffusion is an important factor on crystallization of polymers.2)When amorphous poly-1-lactide was crystallized by annealing, the crystals of the βform was formed by annealing at low temperature and ones of the a form at high temperatures. Further, the βform of crystals were transformed into the α form at a temperature just below the melting point. The relationship between the two crystalline forms was ambiguous so far, and it was made clear in the present work.3)Structural formation in high speed spinning is an important theme from the industrial point of view. The study concerning with the structural development and its formation mechanism is in the undeveloped field of fiber science. In cooperation with members of other groups, we were responsibility for electron microscopy and atomic force microscopy of the poly(naphthalene terephthalate) fiber spun at high speed. The high-speed-spun fiber exhibited the different texture from the fiber obtained at low spinning speed. However, it is room for further studies why the structure and the manner of structural development depend on the spinning speed. Less