CRYSTAL-STRUCTURE OF ISOTACTIC POLY(METHYL METHACRYLATE)
CRYSTAL-STRUCTURE OF ISOTACTIC POLY(METHYL METHACRYLATE)
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DOI：
10.1021/ma00233a029
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发表时间：
1982-01-01
期刊：
影响因子：
5.5
通讯作者：
CHALLA, G
中科院分区：
文献类型：
--
作者：
BOSSCHER, F;TENBRINKE, G;CHALLA, G
用X射线衍射和能量计算确定了等规聚甲基丙烯酸甲酯（it-PMMA）的结构。从高结晶度的取向样品拍摄X射线衍射照片，并测量所观察到的反射的强度和位置。结果表明，虽然晶胞参数与文献报道的正交晶胞参数略有不同，但其晶胞仍为三斜晶系。有利的构象计算能量最小化，应用虚键法。我们的结果支持Tadokoro提出的it-PMMA以10/1双链螺旋结构结晶，稳定化能为12.4kj/（基摩尔）。
The structure of isotactic poly (methyl methacrylate)(it-PMMA) has been determined by X-ray analysis and energy calculations. X-ray diffraction photographs were taken from an oriented sample of high crystallinity and the intensities and positions of the observed reflections were measured. The results indicate that the unit cell is triclinic although the unit-cell parameters are only slightly different from those of the orthorhombic cells reported in the literature. Favorable conformations are calculated by energy minimization, applying the virtual bond method. Our results support the suggestion of Tadokoro that it-PMMA crystallizes in a double-stranded 10/1 helixwith a stabilization energy of 12.4 kj/(base mol).