Molecular and Functional Design of Polysiloxane Graft Polymers.

本研究的主要目的如下：1.研究内容。明确的聚硅氧烷接枝聚合物合成方法的建立。了解聚合物结构与透氧性之间的基本关系。聚硅氧烷化合物新功能的开发。具体内容1：发现并建立了新型低聚硅氧烷单体和大分子单体的合成方法，如以不同结构的低聚二甲基硅氧烷为p-取代基的聚二甲基硅氧基丙烯腈和苯乙烯衍生物。这些结果发表在《波利姆》杂志上。Comm，26(5)，133(1985)，四面体Lett，26(47)，5385(1985)等.内容2：阐明了气体通过均相聚合物膜的渗透受扩散系数的控制.低聚二甲基硅氧烷作为取代基能有效地提高气体在膜中的扩散性。结果3：聚硅氧烷和含氟聚合物的低表面自由能被成功地聚集在共混聚合物膜的表面。这种表面改性不仅有效地提高了氧的透过性，而且提高了氧在氮气上的选择性。

The objectives of this research are as follows.1. Establishment of the synthetic method of well-defined polysiloxane graft polymers.2. Understanding of fundamental relation between the polymer structure and oxygen permeability.3. Development of new functions of polysiloxane compounds.Concerning 1: the synthetic methods of new oligosiloxane monomers and macromers, such as <alpha> -oligodimethylsiloxanylacrylonitrile and styrene derivatives with oligodimethylsiloxane of various structure as p-substituent were found and established. These results were reported in Polym. Comm., 26(5), 133(1985), Tetrahedron Lett., 26(47), 5385(1985), etc.Concerning 2: It was elucidated that the permeation of gases through the homogeneous polymer membrane was controlled by the diffusion coefficient. The oligodimethylsiloxanes were found to act effectively to increase the diffusibility of gases through the membrane by their vigorous motion as substituents. The extent of the motion was quantitatively analyzed by NMR.Concerning 3: The low surface free energy of polysiloxane and flurine atom containing polymer was used successfully to accumulate at the surface of the blend polymer film. Such surface modification was found to be quite effective to enhance not only the permeability of oxygen, but also to enhance the selectivity of oxygen permeation over nitrogen.