Ihn K J, Tsuji M, Kawaguchi A, Katayama K
Laboratory of Polymer Crystals, Kyoto University, Japan.
Microsc Res Tech. 1992 Jan 15;20(2):205-16. doi: 10.1002/jemt.1070200208.
The polymorphism of a long-chain cycloparaffin (CH2)120 and chain packing in its crystals were discussed on the basis of some results obtained mainly by transmission electron microscopy. Monoclinic and orthorhombic single crystals of (CH2)120 were isothermally grown together from a dilute solution in p-xylene. Lozenge-shaped orthorhombic single crystals were more frequently observed than lath-shaped monoclinic ones. The basal surfaces of orthorhombic and monoclinic single crystal platelets were decorated with vapor-deposited polyethylene [PE]. Orthorhombic single crystals of (CH2)120 with the (110) twin boundary and monoclinic ones with the (100) twin boundary were also observed. Rod-like edge-on crystals of (CH2)120 were grown from a dilute p-xylene solution onto the (001) surface of alkali halides. The crystal system of the (CH2)120 edge-on crystals depended on the kind of substrate. The monoclinic crystal was grown on NaCl, the orthorhombic one on KBr and KCl. The monoclinic form of (CH2)120 edge-on crystal was transformed to the orthorhombic one by annealing on NaCl. In both monoclinic and orthorhombic edge-on crystals, the molecular plane determined by two zigzag stems in a molecule of (CH2)120 was parallel to the substrate surface and the molecular axis (crystallographic c-axis) was perpendicular to the longer side of the rod-like edge-on crystals. The sub-cell dimensions of the stem chains in both forms of (CH2)120 crystals were very similar to those of monoclinic and orthorhombic PE crystals, respectively.
基于主要通过透射电子显微镜获得的一些结果，讨论了长链环烷烃(CH2)120的多晶型及其晶体中的链堆积。(CH2)120的单斜晶系和正交晶系单晶从对二甲苯稀溶液中一起等温生长。菱形正交单晶比板条状单斜单晶更常被观察到。正交和单斜单晶片的基面都用气相沉积的聚乙烯[PE]修饰。还观察到具有(110)孪晶界的(CH2)120正交单晶和具有(100)孪晶界的单斜单晶。(CH2)120的棒状端接晶体从对二甲苯稀溶液生长到碱金属卤化物的(001)表面上。(CH2)120端接晶体的晶系取决于衬底的种类。单斜晶在NaCl上生长，正交晶在KBr和KCl上生长。(CH2)120端接晶体的单斜晶型通过在NaCl上退火转变为正交晶型。在单斜和正交端接晶体中，(CH2)120分子中由两个锯齿形链段确定的分子平面与衬底表面平行，分子轴(晶体学c轴)垂直于棒状端接晶体的长边。两种形式的(CH2)120晶体中链段的亚晶胞尺寸分别与单斜和正交PE晶体的非常相似。
