不互溶聚合物链间互扩散对去湿动力学的影响
Influence of Chain Interdiffusion Between Immiscible Polymers on Dewetting Dynamics
摘要：
用中子反射法和去湿法研究了两种不相容聚合物聚苯乙烯（PS）和聚二甲基硅氧烷（PDMS）的界面。出乎意料的是，我们发现，PS链扩散的PDMS刷在温度远低于PS的玻璃化转变温度，动力学在很大程度上取决于接枝密度的刷。通过这项研究，我们证明了链相互扩散对一对不相容聚合物摩擦性能的主要影响。另外，从去湿实验中观察到的PS薄膜的令人困惑的老化被发现与PS/PDMS界面的改性直接相关。
英文摘要：
The interface between two immiscible polymers, polystyrene (PS) and polydimethylsiloxane (PDMS), was studied by neutron reflectivity and dewetting by using free PS chains and PDMS brushes. Unexpectedly, we found that the PS chains diffuse in the PDMS brushes at temperatures well below the glass transition temperatures of PS, the dynamics being largely determined by the grafting density of the brush. By this study, we demonstrate the major influence of the chains interdiffusion on the friction properties for a couple of immiscible polymers. By the way, the puzzling ageing of PS thin films observed from dewetting experiments is found to be directly related to modifications of the PS/PDMS interface.
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