纳米粒子填充动力学不对称的高分子共混物薄膜的结构及稳定性研究

本项目以具有动力学不对称性的高分子共混物薄膜为基本研究对象，拟采用光学显微镜、原子显微镜、中子反射等手段，研究不同膜厚、组成比、温度等实验条件下的薄膜结构演变。通过分析薄膜结构特征，确定粘弹相分离在薄膜中的发生条件，并从相分离与去润湿二者耦合的角度对海-岛结构、共连续结构及网络结构等不同结构的控制机理进行阐释。在此基础上引入纳米粒子，通过改变粒径与膜厚的相对大小、粒子表面性质及含量等因素来对三元共混物薄膜结构进行调控。结合光学显微镜、原子力显微镜及透射电镜等实验手段研究薄膜结构演变过程及粒子分布情况，通过分析粒子对薄膜相分离、去润湿及结构演变动力学的影响，获得粒子在动力学不对称的三元共混物薄膜结构演变过程中的贡献，为全面利用粒子来实现多组分高分子薄膜材料的结构调控提供坚实的理论依据。

The structure evolutions of polymer blend thin films with dynamic asymmetry will be investigated mainly by optical microscopy(OM), atomic force microscopy(AFM) and neutron reflectivity(NR) measurements. Different structures such as droplet-matrix, co-continuous or network structures can be induced by changing the film thickness, composition ratio and temperature, whose mechanism will be explained by the coupling of phase separation and dewetting. According to the structure characteristic, the experimental condition for the occurrence of viscoelastic phase separation in polymer blend thin films will be determined. Moreover, the blend thin film structure will be regulated by nanoparticles in consideration of the relative value of diameter of nanoparticles and film thickness, the surface property and loading of nanoparticles. The film structure evolution and the dispersion of nanoparticles will be investigated by OM/AFM/TEM(transmission electron microscopy). By analyzing the effect of nanoparticles on phase separation, dewetting and the kinetics of film structure evolution, the contribution of nanoparticles to the structure evolution in these ternary blend thin films with dynamic asymmetry will be acquired, which will provide a sound theoretical basis for the full utilization of nanoparticles to realize the structure manipulation of multicomponent polymer thin films.