Crystal lattice deformation and the mesophase in poly(ethylene terephthalate) uniaxially drawn by solid-state coextrusion

Sun, Tao; Zhang, A.; Li, F.M.; Porter, Roger S.

doi:10.1016/0032-3861(88)90099-7

Cited by 30 publications

(17 citation statements)

References 18 publications

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“…Because PET is the most commercially important polyester, its crystal structure has been intensively studied 11–15. Within the triclinic crystal, the (105) planes are roughly perpendicular to the chain axis, whereas the (100) planes are roughly parallel to the phenyl planes and the (010) planes are at 80 and 59° to the (105) and (100) planes, respectively 12.…”

Section: Resultsmentioning

confidence: 99%

Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers

Leung

Cheung

Lin

et al. 2007

J of Applied Polymer Sci

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Poly(ethylene terephthalate) was extruded, solid-state-drawn, and annealed to simulate the structure of poly(ethylene terephthalate) microfibers in a poly(ethylene terephthalate)/polypropylene blend. Differential scanning calorimetry and wide-angle X-ray scattering analyses were conducted to study the structural development of the poly(ethylene terephthalate) extrudates at different processing stages. The as-extruded extrudate had a low crystallinity ($ 10%) and a generally random texture. After cold drawing, the extrudate exhibited a strong molecular alignment along the drawing direction, and there was a crystallinity gain of about 25% that was generally independent of the strain rates used (0.0167-1.67 s À1 ). 2y scans showed that the strain-induced crystals were less distinctive than those from melt crystallization. During drawing above the glass-transition temperature, the structural development was more dependent on the strain rate. At low strain rates, the extrudate was in a state of flow drawing. The resultant crystallinity hardly changed, and the texture remained generally random. At high strain rates, straininduced crystallization occurred, and the crystallinity gain was similar to that in cold drawing. Thermally agitated short-range diffusion of the oriented crystalline molecules was possible, and the resultant crystal structure became more comparable to that from melt crystallization. Annealing around 2008C further increased the crystallinity of the drawn extrudates but had little effect on the texture.

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Section: Resultsmentioning

confidence: 99%

Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers

Leung

Cheung

Lin

et al. 2007

J of Applied Polymer Sci

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“…In the literature, a third phase, or so-called intermediate phase, or oriented mesophase, oriented amorphous phase, or taut-tie molecular phase has been discussed [27,[42][43][44][45]. In the literature, a third phase, or so-called intermediate phase, or oriented mesophase, oriented amorphous phase, or taut-tie molecular phase has been discussed [27,[42][43][44][45].…”

Section: Discussionmentioning

confidence: 99%

Structure evolution and mechanical behavior of poly(ethylene terephthalate) fibers drawn at different number of drawing stages

Haji

Rahbar

2012

CI&CEQ

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In this work, the structure, mechanical and thermal properties of PET fiber obtained by hot multi-stage drawing have been investigated in terms of their dependence on the number of drawing steps at an equivalent total draw ratio. Differential scanning calorimetry, birefringence, wide-angle x-ray diffraction, FTIR spectroscopy, tensile properties, and taut-tie molecules were used to characterize the fine structure and physical properties of the fibers. Results have been explained in terms of a higher drawing residence time at an equivalent drawing speed. For single stage drawn fiber, a high tensile strength is obtained, whereas a high initial modulus is obtained for fiber drawn at three-stage drawing. According to the results, an important finding is that three-stage drawing process has the potential to produce high-modulus fibers. The enhanced fraction of taut-tie molecules is found in three-stage drawn fiber, which is believed to be one of the important factors leading to the high modulus achieved in fibers drawn in hot multistage

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“…There have been many studies concerning the crystalline and oriented states of PET over a range of temperatures, draw ratios and deformation rates. [26][27][28][29][30][31][32] Wakelyn 33 has done experiments on both PET films and fibres; accordingly he suggested that Tomasholskii and Markova 28 cell is applicable for PET film, whereas the Daubery, Bunn and Brown 20 cell is applicable for PET fibre. We will only be concerned here with the fibre crystal structure.…”

Section: Molecular Simulation Of Pet and Penmentioning

confidence: 99%

2D X-ray diffraction and molecular modelling of the crystalline structure of polyesters under uniaxial stress

Abou-Kandil

Goldbeck

2021

Polymers and Polymer Composites

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Studying the crystalline structure of uniaxially and biaxially drawn polyesters is of great importance due to their wide range of applications. In this study, we shed some light on the behaviour of PET and PEN under uniaxial stress using experimental and molecular modelling techniques. Comparing experiment with modelling provides insights into polymer crystallisation with extended chains. Experimental x-ray diffraction patterns are reproduced by means of models of chains sliding along the c-axis leading to some loss of three-dimensional order, i.e. moving away from the condition of perfect register of the fully extended chains in triclinic crystals of both PET and PEN. This will help us understand the mechanism of polymer crystallisation under uniaxial stress and the appearance of mesophases in some cases as discussed herein.

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Crystal lattice deformation and the mesophase in poly(ethylene terephthalate) uniaxially drawn by solid-state coextrusion

Cited by 30 publications

References 18 publications

Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers

Poly(ethylene terephthalate)/polypropylene microfibrillar composites. III. Structural development of poly(ethylene terephthalate) microfibers

Structure evolution and mechanical behavior of poly(ethylene terephthalate) fibers drawn at different number of drawing stages

2D X-ray diffraction and molecular modelling of the crystalline structure of polyesters under uniaxial stress

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