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首页> 外文期刊>Journal of Applied Polymer Science >Transitions of morphological patterns of crystallizing polycarbonate in thin films
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Transitions of morphological patterns of crystallizing polycarbonate in thin films

机译：薄膜中结晶聚碳酸酯的形态模式转变

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This article reports the transitions of morphological patterns of polycarbonate crystals in thin films by solvent-induced crystallization (SINC). As a substrate (silica glass) deposited with an amorphous and micron-thick bisphenol A polycarbonate polymer film is partially dipped into a liquid acetone bath, acetone penetrated rapidly through the polymer film. The rate of acetone penetration is significantly higher than the predicted by Fickian diffusion or anomalous diffusion model, indicating that the capillary force through stress-induced cracks may have played a major role in the upward transport of acetone through the polymer films. The morphologies of polycarbonate at different vertical positions on a substrate surface were analyzed by scanning electron microscopy and atomic force microscopy. It was observed that depending on the local acetone concentration the polymer morphologies showed quite diverse patterns ranging from stress-induced cracks to fully developed three-dimensional spherulites. The diverse morphologies developed during the thin film SINC may serve as a useful platform for further detailed mechanistic analysis of structures and crystallization kinetics.
机译：本文报道了溶剂诱导结晶（SINC）薄膜中聚碳酸酯晶体形态的转变。将沉积有无定形且微米级双酚A聚碳酸酯聚合物薄膜的基板（二氧化硅玻璃）部分浸入丙酮溶液中，丙酮迅速穿透聚合物薄膜。丙酮的渗透速率显着高于Fickian扩散或反常扩散模型所预测的速率，这表明通过应力诱发的裂缝产生的毛细作用力可能在丙酮通过聚合物膜的向上传输中起主要作用。通过扫描电子显微镜和原子力显微镜分析在衬底表面上不同垂直位置的聚碳酸酯的形态。观察到，取决于局部丙酮浓度，聚合物形态显示出非常多样的模式，范围从应力引起的裂纹到完全发展的三维球晶。薄膜SINC期间形成的各种形貌可作为进一步详细的结构力学分析和结晶动力学的有用平台。

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