THE CRYSTALLIZATION BEHAVIOR OF URETHANE SUBSTITUTED POLYDIACETYLENE

The crystalline behavior of urethane substitute polydiacetylene was studied by using pohrized light and electron microscopy. The lamellar morphological structure was observed in the crystallized films. The thickness of lamellae is about 300A, being independent of the crystalline temperature. But the size and density of lamellae were dependent on the crystallization temperature. If the molten film was sheared during the crystallzation process the oriented lamellae grew with their long axes perpendicular to the direction of shear and the chain direction was normal to the lamellar surface.

几种新的杂环取代丁二炔类衍生物的三阶非线性光学性能

用简并四波混顿法测试了一系列新合成的丁二炔（ＰＤＡ）类衍生物的三阶非线性极化率，其γ值在１０－３４ｅｓｕ～１０－３０ｅｓｕ之间。其中ｐｏｌｙ－ＰＤＭＡ［聚５－（２－硫甲基－４－甲基）－嘧啶基－戊二炔－１－醇－α－甲基丙烯酸甲酸］的χ（３）值为１２７．１５８×１０－１３ｅｓｕ（０．５３２μｍ），对应的γ值为１１８４５．１９８×１０－３４ｅｓｕ，已接近目前文献所见的最大值１０－２９ｅｓｕ数量级。从ｐｏｌｙ－ＰＤＭＡ的ＵＶ－ｖｉｓ吸收光谱（λｍａｘ，＝３０７ｎｍ）及透射率（０．５３２ｕｍ，Ｔ＝０．０６５）来看，虽所测得的为部分共振γ值，但也是不同寻常了。

分选金属平板的光电检测系统

提出了检测金属平板或边缘塌角的新方法。用Ｈｅ－Ｎｅ激光器作为光源，ＣＣＤ作为光电接收装置，对塌角信号进行检测。对慢反射光的宽度、最大偏移作了详细的计算和讨论，并讨论了ＣＣＤ的位置约束关系。此装置体积小，使用灵活，方便。实验表明，它能很好地完成检测、自动分选金属平板或链板的功能，并具有选出率高的特点。还讨论了装置的安装技术要求以及为提高选出率、降低误选率所采取的数据处理措施。