Growth Mechanism of Polydiacetylene Monolayer at the Air-Water Interface

通过在空气-水界面的原位观察，研究了二乙炔单分子膜的形态变化。表面形貌随铺展液浓度和铺展面面积的变化而变化。通过涂抹较高浓度的溶液，获得了直径为1 mm的二维螺旋结构。当高浓度溶液在小的有界水面上扩散后，通过移动障碍物缓慢增大水面面积，可以得到20 mm×5 mm以上的均匀取向的大单晶磁畴。一种新的检测系统使得能够在界面处观察到来自聚二乙烯单分子膜共轭链的偏振荧光。在整个结构域中，共轭聚合物链沿着一个方向存在。在空气和Ar气氛中，记录了紫外光辐照聚合过程中单分子膜的表面结构。在Ar气氛中，聚合过程中表面形态保持不变。另一方面，在氧气(空气)存在的情况下，晶胞内发生了较大的变形。

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).