Structural Studies of Polyesters. VI. Disordered Crystal Structure (Form II) of Poly(β-propiolactone)
Structural Studies of Polyesters. VI. Disordered Crystal Structure (Form II) of Poly(β-propiolactone)
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聚（β-丙内酯）的无序晶体结构（II 型）的结构研究。
DOI：
10.1295/polymj.7.352
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发表时间：
1975
期刊：
影响因子：
2.8
通讯作者：
H. Tadokoro
中科院分区：
文献类型：
--
作者：
K. Suehiro;Y. Chatani;H. Tadokoro
通过X射线衍射检查聚（β-丙内酯）的改性物（形式II）的晶体结构。这种改变显示了独特的X射线纤维图案，即，在赤道线上的离散反射和在每个层线上的连续散射，这是纵向无序晶体结构的特征。常规晶胞尺寸为a′=7.73，B′=4.48，c（纤维轴）= 4.77 °，γ′=90°。该晶胞包含两个平面锯齿形链。分子链以规则的方式并排堆积，形成平行于a′c平面的片状结构。然而，链沿着纤维轴的相互水平是不规则的，即，晶型II的晶体处于次晶状态。
The crystal structure of a modification (Form II) of poly(β-propiolactone) was examined by X-ray diffraction. This modification shows a unique X-ray fiber pattern, i.e., discrete reflections on the equatorial line and continuous scatterings on each layer line, which is characteristic of a longitudinal disordered crystal structure. Conventional cell dimensions are a′=7.73, b′=4.48, c(fiber axis)=4.77Å, and γ′=90°. The unit cell contains two planar zigzag chains. The molecular chains pack side-by-side in a regular fashion forming a sheet structure parallel to the a′c plane. However, the mutual levels of the chains along the fiber axis are irregular, i.e., the crystal of Form II is in a paracrystalline state.