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Electron microscopy of high-pressure crystallized poly(ethylene terephthalate)

✍ Scribed by Li Liangbin; Zhang Ling; Huang Rui; Fan Wuyi; Hong Shiming; Wang Gang; Zhong Yuemao

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
226 KB
Volume
38
Category
Article
ISSN
0887-6266

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✦ Synopsis

The high-pressure crystallized poly(ethylene terephthalate) samples were investigated with scanning electron microscopy. The striation appearance, which is the most common feature of polymer extended-chain crystals, was clearly observed. Poly-(ethylene terephthalate) extended-chain crystals with thickness up to 17 m were obtained at high pressure. Fibrous crystals were also formed at high pressure. The fracture behaviors, which affected the exposure of the striations, were also discussed.

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Pressure effect on the melting behavior of poly(butylene terephthalate) (PBT) and poly(hexamethylene terephthalate) (PHT) was studied by high-pressure DTA (HP-DTA) up to 320 and 530 MPa, respectively. Cooling rate dependence on the DSC melting curves of the samples cooled from the melt was shown at