The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization ...The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization temperature of poly(trimethylene terephthalate) increased obviously(increased about 20℃) after the process of self-seeding nucleation.The results of polarized light microscopy(PLM) showed that the spherulite size decreased markedly from 40 μm to 8 μm.展开更多
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. Differ...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 (T c). In the temperature range of 363—403 K, banded spherulites occurred. When T c=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 T c≥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.展开更多
文摘The effects of self-seeding nucleation on the crystallization behavior and properties of poly(trimethylene terephthalate) were studied.Differential scanning calorimetry(DSC) results indicated that the crystallization temperature of poly(trimethylene terephthalate) increased obviously(increased about 20℃) after the process of self-seeding nucleation.The results of polarized light microscopy(PLM) showed that the spherulite size decreased markedly from 40 μm to 8 μm.
文摘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 (T c). In the temperature range of 363—403 K, banded spherulites occurred. When T c=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 T c≥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.
