AFM Observation of Microscopic Behavior of Glassy Polymer under Macroscopic Tension
AFM Observation of Microscopic Behavior of Glassy Polymer under Macroscopic Tension
复制标题
宏观张力下玻璃态聚合物微观行为的 AFM 观察
DOI：
10.1299/kikaia.64.758
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
Y. Kashu
中科院分区：
文献类型：
--
作者：
T. Adachi;Y. Tomita;Y. Kashu
聚合物材料在张力下的颈伸是一个特征，可以通过变形引起的分子链结构的演化来物理解释。本研究将原子力显微镜应用于拉伸变形的玻璃状聚合物，观察连续分子到宏观水平的分级结构，并阐明微观和宏观变形行为之间的定量关系。首先，观察了拉制的非晶聚碳酸酯薄膜上的纤维形貌的分级结构：微纤维结构的直径在5至7μm之间；直径在 1 至 2.5 μm 之间；直径约100 nm的纳米原纤维；以及与晶体堆积相对应的规则链图案。其次，利用在样品表面标记的微观晶格图案来研究微观和宏观变形行为之间的关系。对颈部周围微纤维结构的宏观变形和取向进行了定量测量，结果表明，由于颈缩引起的剪切应变，排列的微纤维结构的旋转落后于塑性拉伸的主方向。
Neck propagation of polymeric materials under tension is a characteristic feature which can be physically explained by the deformation induced evolution of molecular chain structure. In this study, atomic force microscope is applied to glassy polymer with tensile deformation to observe the hierarchical structures at successive molecular to macrolevels, and to clarify the quantitative relation between micro- and macroscopic deformation behaviors. First, hierarchical structure of fibrillar morphology on drawn amorphous polycarbonate film were observed : microfibril structure with a diameter between 5 and 7μm ; that with a diameter between 1 and 2.5 μm ; nanofibrils with a diameter of around 100 nm ; and regular chain pattern corresponding to the crystalline packing. Second, microscopic lattice pattern marked on surface of the specimen was employed to investigate the relation between micro- and macroscopic deformation behaviors. Macroscopic deformation and orientation of microfibril structure were quantitatively measured around the neck, which revealed that the rotation of the aligned microfibril structures were behind to that of the principal direction of plastic stretch due to shear strain by necking.