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

Li, Liangbin; Zhang, Ling; Huang, Rui; Wang, Fan; Hong, Shiming; Wang, Gang; Yuemao, Zhong

doi:10.1002/(sici)1099-0488(20000615)38:12<1612::aid-polb60>3.0.co;2-5

Cited by 11 publications

(1 citation statement)

References 16 publications

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“…Although some investigations of the high-pressure crystallization behaviour of PET have been reported, the results have discrepancies [9][10][11]. Recently we have reported that extended-chain crystals of PET with thickness up to 17 µm could be obtained through a high-pressure crystallization process [12][13][14][15][16] could suggest that high pressure may promote the crystallization rate. However, no direct experimental evidence has confirmed this view or concerned the effect of pressure on the process of thickening of PET crystals.…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure on the crystallization behaviour of polyethylene terephthalate

Hong

Huang

2002

J. Phys.: Condens. Matter

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Crystallized polyethylene terephthalate (PET) samples were obtained at high pressures of 200-400 MPa at a temperature of 603 K, and another group of the samples were made at pressures of 250-350 MPa and different temperatures with a fixed supercooling. The samples were investigated by means of differential scanning calorimetry and scanning electron microscopy. Characterization results suggested that high pressure could increase the crystallization rate and promote the thickening process of PET lamellar crystals.

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Section: Introductionmentioning

confidence: 99%

Effect of pressure on the crystallization behaviour of polyethylene terephthalate

Hong

Huang

2002

J. Phys.: Condens. Matter

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Crystallization and crosslinking of polyamide‐1010 under elevated pressure

Yang

Dong

Luan

et al. 2002

J of Applied Polymer Sci

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ABSTRACT:The structure and thermal properties of polyamide-1010 (PA1010), treated at 250°C for 30 min under pressures of 0.7-2.5 GPa, were studied with wide-angle X-ray diffraction (WAXD), infrared (IR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Crystals were formed when the pressures were less than 1.0 GPa or greater than 1.2 GPa. With increasing pressure, the intensity of the diffraction peak at approximately 24°was enhanced, whereas the peak at approximately 20°was depressed. The triclinic crystal structure of PA1010 was preserved. The highest melting temperature of the crystals obtained in this work was 208°C for PA1010 treated at 1.5 GPa. Crosslinking occurred under pressures of 1.0 -1.2 GPa. Only a broad diffraction peak centered at approximately 20°was observed on WAXD patterns, and no melting and crystallization peaks were found on DSC curves. IR spectra of crosslinked PA1010 showed a remarkable absorption band at 1370 cm Ϫ1 . The NOH stretching vibration band at 3305 cm Ϫ1 was weakened. Crystallized PA1010 had a higher thermal stability than crosslinked PA1010, as indicated on TGA curves by a higher onset temperature of decomposition.

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Melt Crystallization and Morphology of Poly(p‐phenylene sulfide) under High Pressure

Lü

Huang

2007

Macro Chemistry & Physics

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The high‐pressure melt‐crystallization behaviors of poly(p‐phenylene sulfide) (PPS) were investigated using WAXD, DSC, TEM and SEM. PPS extended‐chain crystals with c‐axis thickness exceeding 4.5 µm were formed at high pressure. The DSC results showed that the melting temperature and melting enthalpy of high‐pressure crystallized PPS samples were up to 327.53 °C and 94.96 J · g−1, respectively, which were higher than the values of ideal PPS perfect crystals used by some researchers, and the melting enthalpy of the samples fluctuated regularly during the thickening growth of the PPS crystals. Other characteristic morphologies obtained at high pressure, i.e. spherulites and rod‐like crystals, were also presented with the SEM measurements.

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

Cited by 11 publications

References 16 publications

Effect of pressure on the crystallization behaviour of polyethylene terephthalate

Effect of pressure on the crystallization behaviour of polyethylene terephthalate

Crystallization and crosslinking of polyamide‐1010 under elevated pressure

Melt Crystallization and Morphology of Poly(p‐phenylene sulfide) under High Pressure

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