Elucidating the Kinetic and Thermodynamic Driving Forces in Polymer Blend Film Self-Stratification
Elucidating the Kinetic and Thermodynamic Driving Forces in Polymer Blend Film Self-Stratification
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DOI：
10.1021/acs.macromol.8b01397
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发表时间：
2018-09
期刊：
影响因子：
5.5
通讯作者：
Samantha J Rinehart;Guangcui Yuan;M. Dadmun
中科院分区：
文献类型：
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作者：
Samantha J Rinehart;Guangcui Yuan;M. Dadmun
非混相聚合物共混薄膜在沉积过程中的自组装是制备结构多组分薄膜的一个有吸引力的途径。自旋铸造过程中自分层形成的深度轮廓可以通过简单地修改加工条件来改变，即使在短时间尺度上也是如此。然而，目前的自分层实践使用的聚合物共混物是针对特定应用优化性能的，并且对指导分层过程的潜在驱动力知之甚少。我们的研究试图填补这一空白，通过使用中子反射率来监测由聚（3-己基噻吩-2,5-二基）（P3HT）和聚（甲基丙烯酸甲酯）（PMMA）组成的共混物的分层，作为样品和加工条件的函数：自旋铸造速度、聚合物共混物组成和聚合物分子量。这些参数都是单独变化的，每个参数都提供了分层程度的正交控制。c的增加…
Self-assembly of immiscible polymer blend films during deposition presents an attractive avenue to fabricate structured multicomponent thin films. Depth profiles formed by self-stratification during spin-casting can be varied simply by modifying processing conditions, even on short time scales. However, the current practice of self-stratification utilizes polymer blends that are specific for optimizing properties of a desired application and provides little insight into the underlying driving forces that guide the process of stratification. Our research seeks to fill this gap by using neutron reflectivity to monitor the stratification of blends consisting of poly(3-hexylthiophene-2,5-diyl) (P3HT) and poly(methyl methacrylate) (PMMA) as a function of sample and processing condition: spin-casting speed, polymer blend composition, and polymer molecular weight. Each of these parameters was varied individually, and each parameter provided orthogonal control of the extent of stratification. An increase in the c...