聚对苯二甲酸1,3-丙二醇酯溶液浇铸薄膜形态结构

聚对苯二甲酸1，3-丙二醇酯(PTT)是典型的半结晶聚合物，从熔体结晶形成球品，在某一结晶温度范围内，在球晶中可观察到环带结构，一般认为，环带球品的形成归因于片晶沿球晶径向的周期性扭曲，本文研究了PTT溶液浇铸薄膜在溶剂挥发过程中等温结晶的形态结构。

Morphological Structure of Solution-cast Poly(trimethylene terephthalate) Thin Film

The morphological structure of poly(trimethylene terephthalate)(PTT) thin films solution-cast at various temperatures was investigated by using polarized light microscopy and atomic force microscopy techniques. Different morphologies of the PTT films were observed at different crystallization temperatures (Tc). In the temperature range of 363-403 K, banded spherulites occurred. When Tc=413 K, the center location of the spherulite showed banded structure, while the outer region of the spherulite displayed a spherulite structure without ring-band. When Tc≥423 K, the normal non-banded spherulite was found. The main reason for producing the ring-banded spherulite is the effect of residual solvent during the crystallization processs of the solution-cast films. At higher crystallization temperatures(≥423 K), no residual solvent exists during the crystallization of the films since the evaporation rate is higher at higher temperatures. So no banded structure is formed.