The effect of substrate modification on the ordering and dewetting behavior of thin liquid-crystalline polymer films
The effect of substrate modification on the ordering and dewetting behavior of thin liquid-crystalline polymer films
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基材改性对液晶聚合物薄膜有序和反润湿行为的影响
DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
G. J. Fleer
中科院分区：
文献类型：
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作者：
M. V. D. Wielen;E. Baars;M. Giesbers;M. C. Stuart;G. J. Fleer
研究了以顺丁烯二酸酐为主链、甲氧基联苯为侧链的液晶聚合物在化学改性硅衬底上的有序性和稳定性。对于未经修饰的硅片，众所周知，聚合物−衬底相互作用会在薄膜中诱导平行分层，从而得到相当稳定的薄膜。当表面基团改变时，即通过硅烷化，聚合物和表面之间的相互作用可以被调节。这导致了不稳定的薄膜具有强烈依赖于温度和衬底的去湿行为。在较低温度下，中间相孔形核，并被不稳定的边缘包围。在较高温度下退火后，轮缘不稳定性降低，脱湿速度增加。这一特征也出现在另一种完全不同的侧链液晶聚合物中，侧链中含有甲基丙烯酸酯主链和氰基联苯基团。我们认为……
Liquid-crystalline polymers with maleic acid anhydride moieties in the backbone and methoxybiphenyl groups in the side chain have been investigated with respect to the ordering in and stability of thin films on chemically modified silicon substrates. For unmodified silicon wafers, it is known that the polymer−substrate interaction induces parallel layering in the film, resulting in rather stable films. When the surface groups are changed, i.e., by silylation, the interaction between the polymer and the surface can be tuned. This results in unstable films with a dewetting behavior that is strongly temperature and substrate dependent. At low temperatures in the mesophase holes nucleate, which are encircled by unstable rims. Upon annealing at higher temperature the rim instability decreases and the dewetting velocity increases. This feature also occurs for another completely different side-chain liquid-crystalline polymer with a methacrylate backbone and cyanobiphenyl groups in the side chains. We ascribe th...