METHOD FOR ESTIMATING THE CONFIGURATIONAL ENTROPY OF MACROMOLECULES
METHOD FOR ESTIMATING THE CONFIGURATIONAL ENTROPY OF MACROMOLECULES
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DOI：
10.1021/ma50003a019
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发表时间：
1981-01-01
期刊：
影响因子：
5.5
通讯作者：
KUSHICK, JN
中科院分区：
文献类型：
--
作者：
KARPLUS, M;KUSHICK, JN
结论7型分子链以轻微的单斜角ß（= 93）排列在一个细胞内，符合Takahashi和Tadokoro模型；然而，b轴长度更接近Weinhold， Litt和Lando报道的值。2,4 PVF2在NaCl上的外延结晶得到了7相晶体，其中一个平面平行于衬底。提出可能存在7-PVF2 （e相）的反极性类似物；然后，7和e形式将以与和a阶段相同的方式相互关联。与HD博士进行有益的讨论
Conclusions It has been found that 7-type molecular chains pack in a unit cell with a slight monoclinic angle ß (= 93), in agreement with the model of Takahashi and Tadokoro; 5 the b-axis length is, however, closer to the value reported by Weinhold, Litt, and Lando. 2, 4 Epitaxial crystallization of PVF2 on NaCl yields 7-phase crystals grown with one of their¡ 110} planes parallel to the substrate. Possible existence of an antipolar analogue of 7-PVF2 (e phase) is suggested; the 7 and e forms would then be mutually re-lated in the same manner as the and a phases.Acknowledgment. Helpful discussions with Dr. HD