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研究生： 陳孟歆
Chen, Meng-Hsin
論文名稱： PEO/黏土奈米複合材料之晶體取向性研究
Crystal Orientation of Poly(ethylene oxide) in Poly(ethylene oxide)/Clay Nanocomposites
指導教授： 陳信龍
Chen, Hsin-Lung
口試委員:
學位類別： 碩士
Master
系所名稱： 工學院 - 化學工程學系
Department of Chemical Engineering
論文出版年： 2009
畢業學年度： 97
語文別： 英文
論文頁數： 99
中文關鍵詞： PEO/黏土奈米複合材料 、PEO晶體取向性
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    • Polymer/clay nanocomposites have attracted much attention due to their unique mechanical, electrical, optical, and thermal properties. In this study, we have prepared highly oriented PEO/clay nanocomposite films in which the clay platelets stacked perpendicular to film surface. The composite films with different contents of clay were prepared by solvent casting with different solvent removal rates. The orientation of PEO crystal with respect to the clay platelets was then investigated by synchrotron wide angle x-ray scattering (WAXS). From the 2-D WAXS patterns, homeotropic orientation of PEO crystals was observed in the composites prepared by slow solvent evaporation irrespective of clay content and crystallization temperatures. In the films prepared by fast solvent removal, the PEO crystals were found to display homogeneous orientation preferentially. Subsequent shearing treatment of the composite films may shift the homogeneous orientation to homeotropic state.

    Abstract 1 Index 2 Table Index 4 Figure Index 6 Chapter 1 Introduction 13 1.1 Structure of clay 13 1.2 Polymer-clay nanocomposites 15 1.2-1 Preparation of polymer-clay nanocomposites 17 1.2-2 Properties and applications of polymer-clay nanocomposites 22 1.3 PEO-clay nanocomposites 30 1.4 Identification of PEO crystal orientation in PEO/clay nanocomposite 43 1.5 Motivation and objective of the present study 45 Chapter 2 Experimental section 46 2.1 Materials 46 2.2 Nanocomposites preparation 46 2.3 Crystallization history of the nanocomposites isothermal crystallization of unsheared composite films 47 2.4 Characterizations 48 Chapter 3 Results and discussion 49 3.1 Intercalation of PEO into clay gallery 49 3.2 A large-length-scale structure of the nanocomposite films 51 3.3 Clay otrirentation in nanocomposite films 58 3.4 Crystal orientations in PEO/clay nanocomposite films crystallized at different temperatures 62 3.5 Crystal orientation in sheared F-series nanocomposite films 80 3.6 Crystallization kinetics of PEO in PEO/clay nanocomposite films 92 Chapter 4 Conclusion 96 Reference 98

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