Growth Mechanism of Polydiacetylene Monolayer at the Air-Water Interface

通过在空气-水界面上的原位观察，研究了丁二炔单分子膜的形态变化。表面形貌随铺展液浓度和铺展面积的变化而变化。通过铺展相对高浓度的溶液，获得了直径为1 mm的二维螺旋结构。将高浓度的溶液铺展在小的有界水面上，通过移动障碍物缓慢增大水面面积，可制备出尺寸大于20 mm × 5 mm的均匀取向的大单晶畴。一种新的检测系统，使偏振荧光观察从共轭链的聚乙烯单分子膜在界面上的长程有序的共轭聚合物链中持续沿着一个方向在整个域。在空气和氩气气氛中记录在聚合过程中通过UV照射的单分子层的表面结构。在氩气气氛中，表面形态在聚合期间保持恒定。另一方面，在氧（空气）的存在下，在晶胞中发现大的变形。

Morphological variation of diacetylene monolayers was investigated by in-situ observation at the air-water interface. The surface morphology changes with concentration of the spreading solution and area of the spreading surface. Two dimensional spiral structures with a diameter as large as 1 mm were obtained by spreading a solution of relatively high concentration. Uniformly oriented large single crystal domains of over 20mm×5mm were prepared when the area of the water surface was slowly increased by moving a barrier after a highly concentrated solution was spread on a small bounded water surface. A novel detection system enabled the observation of polarized fluorescence from the conjugated chains of the polydiaeetylene monolayer at the interface Long range ordering m the conjugated polymer chains persists along one direction throughout a domain. The surface structure of the monolayer during the polymerization process by UV irradiation was recorded in both air and argon atmospheres. In the argon atmosphere, the surface morphology remains constant during polymerization. On the other hand, a large deformation was found in the unit cell in the presence of oxygen (air).