权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Chirality selection and branching mechanism in the pattern formation of polymer crystals

聚合物晶体图案形成中的手性选择和支化机制

基本信息

批准号：
13640386
负责人：
TODA Akihiko
金额：
$ 2.37万
依托单位：
HIROSHIMA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

We have examined the chirality selection and branching mechanism in the pattern formation of higher order structure of polymer crystals. We focused on the structure of banded spherulites, in which a concentric ring pattern is spontaneously generated. We examined the structure in polyethylene and PVDF, which do not have chirality in the molecular chain, by optical and atomic force microscopies.1. We have examined the free surface of a banded spherulite of poly (vinylidene fluoride) (PVDF) by an atomic force microscopy. The directions of the slope of multilayer terraces of lamella crystals are kept in each half of a banded spherulite, and this evidence confirms the macroscopic selection of one of the handedness in the formation of spiral terraces in each growth direction of a banded spherulite of PVDF.2. The three-dimensional morphology of polyethylene single crystals grown from dilute solution has been examined by atomic force microscopy. The observation of single crystals on dried PVA clarifies the morphology of chair type crystal as well as well-known hollow pyramidal type. It has been confirmed that the screw dislocations in the chair type follow a selection rule of the handedness in a manner to relieve the distortion in the chair type.

我们研究了聚合物晶体中高次结构图案形成的手性选择和支化机理。我们专注于带状球晶的结构，其中同心环图案是自发产生的。我们用光学显微镜和原子力显微镜研究了聚乙烯和聚偏氟乙烯分子链中不具有手性的结构。用原子力显微镜研究了聚偏氟乙烯（PVDF）带状球晶的自由表面。层状晶体的多层阶地的倾斜方向保持在带状球晶的每一半中，并且该证据证实了在PVDF的带状球晶的每个生长方向上形成螺旋阶地中的手性之一的宏观选择。用原子力显微镜研究了稀溶液中生长的聚乙烯单晶的三维形貌。在干燥的PVA上观察单晶澄清了椅型晶体以及众所周知的中空金字塔型晶体的形态。已经证实，椅子型中的螺位错遵循旋向性的选择规则，以减轻椅子型中的畸变。