Characterization and Structural Analysis of Solution-Grown Polyacrylonitrile-co-Methacrylic Acid (PAN-co-MAA) Single Crystals

详细信息    查看全文

• 作者：Yiying Zhang ; Marilyn L. Minus
• 刊名：Macromolecules
• 出版年：2014
• 出版时间：June 24, 2014
• 年：2014
• 卷：47
• 期：12
• 页码：3987-3996
• 全文大小：581K
• ISSN：1520-5835

文摘

To date studies regarding the growth and characterization of polyacrylonitrile (PAN)-based polymer single crystals have been limited. Polyacrylonitrile-co-methacrylic acid (PAN-co-MAA) was used in this work, which outlines the conditions for three major types of solution-grown crystals. Electron microscopy and diffraction are used to provide a comprehensive study for chain arrangement and growth characteristics for all crystal morphologies. The three major morphological types included polyhedral and polygonal (i.e., parallelogram and elongated rhombus) crystals. Lower crystallization temperatures (65 掳C) resulted in more even growth along all facets, while crystals formed at both intermediate (75 掳C) and higher (85鈥?5 掳C) temperatures exhibited preferential growth along a specific growth plane. Overall crystal size also increased with elevated crystallization temperature (T_c). On the basis of the experimental d-spacing measured by electron diffraction for the (h00) and (0k0) planes, the crystal unit cell lattice constants along a and b axes are found to be a_o = 1.023 卤 0.003 nm and b_o = 0.612 卤 0.003 nm. This study also examines irradiation sensitivity as it pertains to lattice imaging for these single crystals.