| X-RAY CRYSTALLOGRAPHIC STRUCTURE OF Meta-AND Para-DIMETHYL ESTER OF PYROMELLITIC ACID |
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| 作者姓名： | 黄文溪 刘天西 高连勋 张欣 徐纪平 丁孟贤 |
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| 作者单位： | Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022，Changchun Institute of Applied Chemistry，Chinese Academy of Sciences，Changchun 130022 |
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| 摘 要： | The polycrystalline powder of para- and meta-dimethyl ester of pyromellitic acid (PMDE)have been prepared by fractional crystallization, and their crystal structures have been de-termined by Wide-Angle X-ray Diffraction (WAXD). Both p-PMDE and m-PMDE wasfound to be orthorhombic crystal system, and their unit cell parameters a = 0.840nm,b = 0.707 nm, c = 1.136 nm and a = 1.032 nm, b = 0.835 nm, c = 0.714 nm, respectively.Space group all belongs to P_(mmm). p-PMDE has two molecules per unit cell with crystaldensity 1.388g.cm~(-3), while m-PMDE has two molecules per unit cell with crystal density1.522 g.cm~(-3). Indices of crystal diffraction peaks are also detailed in the present work.The difference in crystal structures between p-PMDE and m-PMDE has thus been usedto explain the curing behavior of isomerically pyromellitic dianhydride-based poly(amicester)s.
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| 收稿时间： | 1995-09-28 |
X-RAY CRYSTALLOGRAPHIC STRUCTURE OF Meta-AND Para-DIMETHYL ESTER OF PYROMELLITIC ACID |
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| HUANG Wenxi,LIU Tianxi,GAO Lianxun,ZHANG Xin,XU Jiping,DING Mengxian.X-RAY CRYSTALLOGRAPHIC STRUCTURE OF Meta-AND Para-DIMETHYL ESTER OF PYROMELLITIC ACID[J].Chinese Journal of Polymer Science,1997,0(1):40-49. |
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| Authors: | HUANG Wenxi LIU Tianxi GAO Lianxun ZHANG Xin XU Jiping DING Mengxian |
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| Institution: | Changchun Institute of Applied Chemistry; Chinese Academy of Sciences; Changchun 130022 |
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| Abstract: | The polycrystalline powder of para- and meta-dimethyl ester of pyromellitic acid (PMDE)have been prepared by fractional crystallization, and their crystal structures have been de-termined by Wide-Angle X-ray Diffraction (WAXD). Both p-PMDE and m-PMDE wasfound to be orthorhombic crystal system, and their unit cell parameters a = 0.840nm,b = 0.707 nm, c = 1.136 nm and a = 1.032 nm, b = 0.835 nm, c = 0.714 nm, respectively.Space group all belongs to P_(mmm). p-PMDE has two molecules per unit cell with crystaldensity 1.388g.cm~(-3), while m-PMDE has two molecules per unit cell with crystal density1.522 g.cm~(-3). Indices of crystal diffraction peaks are also detailed in the present work.The difference in crystal structures between p-PMDE and m-PMDE has thus been usedto explain the curing behavior of isomerically pyromellitic dianhydride-based poly(amicester)s. |
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| Keywords: | WAXD Orthorhombic Polyimide Aromatic diester-diacids |
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