The effect of the melt-drawing ratio on the microstructure and mechanical properties of poly(butylene succinate) cast films with row-nucleated lamellar structure

Xie, Jianhe; Yin, Li; Wu, Yongshi; Xu, Ruijie; Lei, Caihong

doi:10.1016/j.polymertesting.2021.107394

Cited by 6 publications

(5 citation statements)

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“…This result further demonstrates that the DR induces a significant increase in lamella orientation for microporous films. [ 42 ] Analyzing the curves in Figure 6B, compared to the pure UHMWPE film of T‐0, the orientation degree of T‐3 increases slightly from 0.678 to 0.70. This finding strongly confirms our previous speculation that the nanoparticles may have a contribution to the orientation of the lamellar crystals and thus result in the formation of parallel aligned kebab structures.…”

Section: Resultsmentioning

confidence: 99%

“…In semi‐crystalline polymers, the crystalline and amorphous regions are alternately arranged and their long period size is defined as the sum of the thickness of a single lamellar crystal and the thickness of a single amorphous region, which can be calculated by the Bragg equation:

L = \frac{2 π}{q},

where

L

is the dimension of the long period,

q

represents the scattering vector corresponding to the peak scattering intensity. The orientation parameters of the lamella were calculated from the full‐width at half‐height of the azimuthal integration peak according to Herman's function [ 42 ] :

f = \frac{2 < \cos^{2} α > - 1}{2} .

…”

Section: Methodsmentioning

confidence: 99%

“…where L is the dimension of the long period, q represents the scattering vector corresponding to the peak scattering intensity. The orientation parameters of the lamella were calculated from the full-width at half-height of the azimuthal integration peak according to Herman's function [42] :…”

Section: Membrane Characterizationmentioning

confidence: 99%

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Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes

Chen

et al. 2023

Polymer Composites

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The nanocomposite microporous membrane of ultra-high molecular weight polyethylene (UHMWPE) and nano-titanium dioxide (nano-TiO 2 ) system was prepared by combining the thermally induced phase separation (TIPS) technique with the extrusion-casting process using liquid paraffin (LP) as the diluent. The effects of variations of TiO 2 content and melt draw ratio on the properties of composite microporous membranes were studied and the optimal processing parameters were further investigated. ATR-FTIR demonstrated that nanocomposite microporous membranes were successfully prepared. The crystallization behavior and morphological evolution of membranes were systematically investigated by WAXD, 2D-SAXS, and SEM. It was found that the stretch-induced orientation of UHMWPE was promoted and the shish-kebab structure was formed for the reason of addition of TiO 2 . The mechanism of combined effects of nanoparticles and stretch-induced orientation on the crystallization behavior of UHMWPE was further discussed and explained. Compared to pure UHMWPE film, the permeability of the optimum performance film was significantly improved, with porosity of 49% and pure water flux of about 193 L m À2 h À1 . Mechanical studies showed that nanoparticles and DR have significant effects on tensile strength and elongation at break. In addition, the thermal stability of composite microporous membranes was found to be improved with the increase of TiO 2 content and melt draw ratio. Thus, this investigation delivers inspiration for the expansion of excellent performance microporous membranes used for battery separators and filtration devices.

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Section: Resultsmentioning

confidence: 99%

L = \frac{2 π}{q},

where

L

is the dimension of the long period,

q

f = \frac{2 < \cos^{2} α > - 1}{2} .

…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes

Chen

et al. 2023

Polymer Composites

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“…It is generally accepted that both the raw material and processing parameters are key factors for forming highly oriented lamellar structures 10–13 . Much research has focused on the processing parameters such as extruding temperature, melt‐stretching ratio, and cooling air 14–18 . Although researchers generally believe that higher roll temperature is beneficial to the formation of oriented lamellar structures and the improvement of the performance of the stretched microporous membranes, little attention has been paid to the effect of roll temperature.…”

Section: Introductionmentioning

confidence: 99%

“…[10][11][12][13] Much research has focused on the processing parameters such as extruding temperature, melt-stretching ratio, and cooling air. [14][15][16][17][18] Although researchers generally believe that higher roll temperature is beneficial to the formation of oriented lamellar structures and the improvement of the performance of the stretched microporous membranes, little attention has been paid to the effect of roll temperature. Ajji et al 19 suggested that the roll temperature has a crucial role in the orientation of the crystalline as well as the amorphous phases.…”

Section: Introductionmentioning

confidence: 99%

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Chen¹,

Chen

Yin

et al. 2023

J of Applied Polymer Sci

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The effect of roll temperature from 60 to 120°C on the crystalline structure and properties of oriented polypropylene (PP) cast films and the stretched microporous membrane was studied. It was found that the long period, the thickness of the crystalline and amorphous phase increase with the increasing roll temperature. And the regularity of the lamellar structure also improves with the increasing roll temperature. In comparison, the lamellae lateral dimension is nearly unchanged at 50 nm. The orientation of the lamellar structure slightly decreases from 0.81 to 0.76 with increasing roll temperature. The increase of the long period and the improvement of the regularity of the lamellar structure lead to the increase of the elastic recovery value of PP cast film. The corresponding microporous membrane also shows a smaller thickness of lamellar clusters, larger pores, better air permeability and better thermal shrinkage resistance. The higher roll temperature is beneficial to the perfection of the lamellar structure, obtaining the higher‐performance microporous membrane.

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Annealing improves the mechanical properties in poly(butylene succinate) films with oriented lamellar structure: The effect of metastable lamellae

Xie,

Xu,

Hwang

et al. 2024

J of Applied Polymer Sci

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The application range of biodegradable Poly(butylene succinate) (PBS) is highly dependent on its mechanical properties, which can be improved by the annealing process. In this study, the mechanical properties and microstructure of PBS films with oriented lamellar structures annealed at different temperatures were characterized. It was found that the annealing process effectively improves the elastic modulus and yield strength of the oriented PBS film with the increase of annealing temperature, which is completely different from the previous results of other oriented semicrystalline polymers such as PP, PMP, PE, and PVDF. The long periods, lateral dimensions and orientation of the lamellae of the oriented PBS film increase with the increasing annealing temperature. Meanwhile, the low‐temperature endothermic plateau in the DSC curve and the g1,r/Q in the SAXS experiment decrease with annealing temperature, indicating that increasing annealing temperature would reduce the thin and metastable lamellae in the PBS films. Compared the annealing results of oriented PBS films and that of other‐oriented semicrystalline polymers, we suggested the annealing process for the oriented PBS films would reduce the thin lamellae and form thicker lamellae, resulting in an increase in the elastic modulus and yield strength of the annealed PBS films. This study clarifies how the annealing temperature affects the microstructure and mechanical properties of the oriented semicrystalline films.

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The effect of the melt-drawing ratio on the microstructure and mechanical properties of poly(butylene succinate) cast films with row-nucleated lamellar structure

Cited by 6 publications

References 50 publications

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Annealing improves the mechanical properties in poly(butylene succinate) films with oriented lamellar structure: The effect of metastable lamellae

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The effect of the melt-drawing ratio on the microstructure and mechanical properties of poly(butylene succinate) cast films with row-nucleated lamellar structure

Cited by 6 publications

References 50 publications

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO2 composite microporous membranes

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO2 composite microporous membranes

Effect of roll temperature on the structure and properties of oriented polypropylene cast film and stretched microporous membrane

Annealing improves the mechanical properties in poly(butylene succinate) films with oriented lamellar structure: The effect of metastable lamellae

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Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes

Combined effects of nanoparticle and stretch‐induced orientation on crystal structure and properties of UHMWPE/TiO₂ composite microporous membranes