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PRODUCTION OF HIGH FUNCTIONAL COMPOSITES AND MOLECULAR DESIGN・CONTROL OF INTERFACIAL STRUCTURE BY PROBING THE ADSORPTION LAYER OF POLYMERS

通过探测聚合物的吸附层来制造高功能复合材料以及分子设计·界面结构控制

基本信息

批准号：
07505024
负责人：
NAKAMAE Katsuhiko
金额：
$ 8.96万
依托单位：
KOBE UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

项目摘要

The dispersibility, the orientation of filled particle are quite important for the high performance of composite materials. These properties depend on the repulsive power (through osmotic pressure and entropic elasticity of polymer chain) of absorbed polymer layr on the particle, so the conformation of these adsorbed chains were investigated in this study. Monodispersed polymer with terminal functional group (by living anion polymerization), polymer with amino group (by radical polymerization) were synthesized through the precious polymerization technique. The adsorbed conformation was investigated through the techniques as follows : Surface Force Apparatus (purchased through the financial support from this grant (1995)), Atomic Force Microscopy (purchased through the financial support from this grant (1996)), Dynamic Light Scattering, Elipsometry, Surface Tension Apparatus, Electron Microscopy, Surface Force-surface Pressure Apparatus, Pheology Apparatus.The adsorbed conformation of polymer chain on silica, gamma-iron oxide can be expressed with so-called loop-point model, where polar functional group interacts with metal oxide surface (surface is covered with hydroxy group and adsorbed water) and the loop was consisted of hydrophobic chain. This loop is the origin of the repulsive force against coagulation of particles. Three dimensional bulkiness, thickness, and segment density of the loop, and functional group density, occupied area of one functional group on the metal oxide surface were quantified in this study. Relationship between the dispersibility of particles and the adsorbed conformation was also investigated. The segment density of the adsorbed polymer chains was found to be the key factor for the good dispersibility of particles. In conclusion, regulating the interfacial structure brought the high functionality of composite material by probing the adsorbed conformation of the polymer chain.

填充粒子的取向性对复合材料的高性能具有重要意义。这些性质取决于吸附在颗粒上的聚合物层的排斥力（通过渗透压和聚合物链的熵弹性），因此，在本研究中，这些吸附链的构象进行了研究。通过精密聚合技术，合成了单分散的端基聚合物（活性阴离子聚合）、氨基聚合物（自由基聚合）。通过以下技术研究吸附构象：表面力仪（通过该赠款的财政支持购买（1995年）），原子力显微镜（通过该赠款的财政支持购买（1996年）），动态光散射，椭偏仪，表面张力仪，电子显微镜，表面力-表面压力仪，高分子链在二氧化硅、γ-氧化铁表面的吸附构象可用所谓的环点模型表示，即极性官能团与金属氧化物表面相互作用（表面被羟基和吸附水覆盖），环由疏水链组成。这个环是排斥力的起源，反对凝聚的粒子。在这项研究中，对环的三维体积、厚度和片段密度以及官能团密度、金属氧化物表面上的一个官能团的占据面积进行了定量。研究了吸附态构象与颗粒粒径的关系。吸附高分子链的链段密度是影响颗粒吸附性的关键因素。总之，通过对高分子链吸附构象的研究，可以发现通过调控界面结构可以实现复合材料的高功能化。