Influence of laminate thickness reduction on the deformation mechanism of coextruded multilayered PC/PMMA films

Influence of laminate thickness reduction on the deformation mechanism of coextruded multilayered PC/PMMA films
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层压厚度减少对共挤多层PC/PMMA薄膜变形机制的影响

DOI:
10.1002/app.38026
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发表时间:
2012
影响因子:
3
通讯作者:
A. Hiltner
A. Hiltner
中科院分区:
化学3区
文献类型:
--
作者:
S. Scholtyssek;V. Seydewitz;R. Adhikari;F. Pfeifer;G.H. Michler;H.W. Siesler;E. Baer;A. Hiltner

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研究了采用层倍增共挤出技术制备的聚甲基丙烯酸甲酯(PMMA)/聚碳酸酯(PC)多层复合材料的形态结构对其力学性能,特别是微观力学变形行为的影响。电子显微镜研究表明,PC/PMMA多层复合材料具有良好的取向,均匀和连续的层状结构。随着复合材料中每种聚合物层厚度的降低,发现薄膜的断裂伸长率显著增加,这与从双组分行为(单层厚度≥8 μm)到单组分行为(单层厚度≤250 nm)的转变相关。使用FTIR光谱的流变光学测量表明,对于所有研究的膜,PMMA相拉伸期间的分子取向保持不变,而PC取向函数随着层厚度的减小而减小。© 2012 Wiley Periodicals,Inc. J.应用聚合物科学,2013
The influence of the morphology of multilayered composites of poly(methyl‐methacrylate) (PMMA) and polycarbonate (PC) fabricated by layer multiplying coextrusion technique on their mechanical and especially their micromechanical deformation behavior was investigated. Electron microscopic studies revealed that the PC/PMMA multilayered composites have a well‐oriented, uniform, and continuous layered architecture. With decreasing layer thickness of each polymer in the composite, the elongation at break of the films was found to increase significantly which was correlated with a transition from a two‐component behavior (for single‐layer thickness of ≥8 μm) to an one‐component behavior (for single‐layer thickness of ≤250 nm). Rheo‐optical measurements using FTIR spectroscopy revealed that the molecular orientation during stretching of the PMMA phase remains unchanged for all the investigated films, whereas the PC orientation function decreases with decreasing layer thickness. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
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