Tracking the Evolution of Polymer Interface Films during the Process of Thermal Annealing at the Domain and Single Molecular Levels using Scanning Tunneling Microscopy.
Tracking the Evolution of Polymer Interface Films during the Process of Thermal Annealing at the Domain and Single Molecular Levels using Scanning Tunneling Microscopy.
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DOI：
10.1021/acs.langmuir.6b02139
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发表时间：
2016-09
期刊：
影响因子：
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通讯作者：
Xiao-Ling Duan;Huaming Chen;Jianyao Huang;Zhi-fei Liu;Jin-Kuo Li;Zhi-Yong Yang;Weifeng Zhang
中科院分区：
文献类型：
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作者：
Xiao-Ling Duan;Huaming Chen;Jianyao Huang;Zhi-fei Liu;Jin-Kuo Li;Zhi-Yong Yang;Weifeng Zhang
利用扫描隧道显微镜图像测量的统计数据和理论计算，在畴和单分子水平上揭示了聚合物（NTZ 12）界面膜在退火过程中的结构演化。首先，界面膜的共同特点进行了研究。然后，平均值的表面占有率，尺寸和密度的域被用来揭示各自阶段的内在推导。新结构域的形成在70 °C下触发，但结构域成熟未被激活。在110 °C时，新结构域的形成速度几乎与成熟过程的消耗平衡。然而，新畴的形成在150 °C下严重减少，但在190 °C下重新开始。在单分子水平上，线性骨架与弯曲骨架的平均长度之比在退火过程中增加，而线性骨架与弯曲骨架的总长度和总数之比在150 °C时达到峰值。所有样品的弯曲骨架的两种主要构象是120°和180°弯曲，但在150 °C下的熟化显著减少了180°折叠。分子动力学模拟揭示了弯曲骨架在高温下的快速弛豫过程。
Structural evolution of polymer (NTZ12) interface films during the process of annealing is revealed at the domain and single molecular levels using the statistical data measured from scanning tunneling microscopy images and through theoretical calculations. First, common features of the interface films are examined. Then, mean values of surface-occupied ratio, size and density of the domain are used to reveal the intrinsic derivation of the respective stages. Formation of new domains is triggered at 70 °C, but domain ripening is not activated. At 110 °C, the speed of formation of new domains is almost balanced by the consumption due to the ripening process. However, formation of new domains is reduced heavily at 150 °C but restarted at 190 °C. At the single molecular level, the ratio of the average length of linear to curved backbones is increased during annealing, whereas the ratios of the total length and the total number of linear to curved skeletons reaches a peak value at 150 °C. The two major conformations of curved backbones for all samples are 120° and 180° bending, but the ripening at 150 °C reduces 180° folding dramatically. Molecular dynamic simulations disclose the fast relaxing process of curved skeletons at high temperature.