Effect of Molecular Structure on the Surface Morphology of Ultrathin Films by Competing Crystallization and Dewetting Processes
Effect of Molecular Structure on the Surface Morphology of Ultrathin Films by Competing Crystallization and Dewetting Processes
复制标题
竞争结晶和去湿过程分子结构对超薄膜表面形貌的影响
DOI：
--
复制
发表时间：
2010
影响因子：
10.9
通讯作者：
Hong Xiao-Yin
中科院分区：
文献类型：
--
作者：
Zhang Feng-Bo;Yuan Jin-Ying;Yuan Wei-Zhong;Xie Xu-Ming;Hong Xiao-Yin
用原子力显微镜(AFM)研究了星形支化聚(e-己内酯)(PCL)，包括六臂星形PCL(HPCL)、树枝状PCL(DPCL)和线形PCL(LPCL)在云母上的旋涂。原子力显微镜(AFM)研究了分子结构对超薄膜(约15 nm)吸湿脱湿行为的影响。在旋涂过程中，膜的形成是由竞争脱湿和结晶过程控制的。差示扫描量热法(DSC)表明，DPCL的结晶性弱于HPCL，HPCL的结晶性弱于LPCL根据PCL的分子结构和相对分子质量的不同，结晶和脱湿之间的竞争导致了LPCL、HPCL和DPCL超薄膜的表面形貌，如完美的球晶、开放的球晶、树枝状片晶和分散的不同尺寸的液滴。
Star-branched poly(e-caprolactone) (PCL) including hexa-armed star-shaped PCL (HPCL),dendritic PCL (DPCL),and linear PCL (LPCL) were spin-coated onto mica substrates at room temperature.The effect of molecular structure on the wetting-dewetting behavior of ultrathin film (about 15 nm) was investigated with atomic force microscopy (AFM).During spin-coating,film formation is governed by competing dewetting and crystallization processes.According to differential scanning calorimetry (DSC),the crystallizability of DPCL is weaker than that of HPCL which is weaker than that of LPCL,when they have the same relative molecular mass.Depending on the molecular structure and the relative molecular mass of PCL,the competition between crystallization and dewetting results in ultrathin films of LPCL,HPCL,and DPCL with surface morphologies such as perfect spherulites,open spherulites,dendritic lamellae,and dispersed droplets of different sizes.