Microporous membranes obtained from polypropylene blend films by stretching

Tabatabaei, Seyed H.; Carreau, Pierre J.; Ajji, Abdellah

doi:10.1016/j.memsci.2008.09.001

Cited by 183 publications

(162 citation statements)

References 21 publications

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“…However, low porosity and poor permeability restricted its wide application. In order to improve the morphology and performance of the membrane, post-treatment was frequently used to control the performance parameters [2][3][4]. Post-treatment mainly contained stretching which could improve the pore size, porosity, mechanical property [5] and heattreatment which could steady the structure of the membrane and improve the use performance [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Post-treatment effect on morphology and performance of polyurethane-based hollow fiber membranes through melt-spinning method

Liu

Xiao

et al. 2013

Journal of Membrane Science

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Section: Introductionmentioning

confidence: 99%

“…Consequently, extensive studies had been reported in the literature. Tabatabaei et al [4] studied the effects of stretching on polypropylene films. They found that the water vapor transmission rate rose with the applied extension increment during hot stretching, but the effect was inversed for cold stretching.…”

Section: Introductionmentioning

confidence: 99%

Post-treatment effect on morphology and performance of polyurethane-based hollow fiber membranes through melt-spinning method

Liu

Xiao

et al. 2013

Journal of Membrane Science

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“…In addition, drawing of semicrystalline polymers can improve barrier properties through stress-induced crystallization and orientation of the remaining amorphous phase [25]. In some cases, a permeability increase was observed as consequence of microvoid development during orientation of the polymer chains after crystallinity was fully developed [26].…”

Section: Theory Of Permeationmentioning

confidence: 99%

Permeability in Clay/Polyesters Nano-Biocomposites

Sorrentino

Gorrasi

Vittoria

2012

Environmental Silicate Nano-Biocomposites

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In this chapter we focus on the barrier properties of nanocomposite of biodegradable polyesters with layered inorganic fillers. First of all, to better understand the influence of the lamellar inorganic fillers on the permeability, the theory of permeation and the barrier models so far developed for polymer nanocomposites are reviewed. Afterwards the barrier properties of the most important biodegradable polyesters filled with inorganic lamellar solids, such as Polylactic acid (PLA), Polycaprolactone (PCL), Polyhydroxbutyrate (PHB), and Polybutylenesuccinate (PBS) are reviewed and the outstanding results enlightened. As a general trend, the best improvement of barrier properties is related to the exfoliation of clay platelets into the polymeric matrix, and this in turn is dependent on the chemical structure of the clay, the organic modification, the filler concentration and the processing procedure to prepare the composite. Where possible, all these parameters were reported and correlated with the final properties. Also the contrasting effect of clays on the two parameters determining the water permeability, that is sorption and diffusion, is reported in many cases.

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“…There have been many works to build the relationship among the material characteristics, processing technology, structure and properties of stretched microporous membrane [4][5][6][7][8][9][10][11][12][13][14][15][16][17]. During the third stage, low-temperature stretching leads to the formation of initial bridges connecting the separated lamellae [18].…”

Section: Introductionmentioning

confidence: 99%

Influence of heat-treatment temperature on the structure and properties of polypropylene microporous membrane

Xie

Chen

et al. 2015

Polym. Bull.

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The polypropylene (PP) microporous membrane has been used in the Lithium battery as a separator. During the charge and discharge process, the temperature in the battery may rise. To clarify the microstructure change mechanism of membrane during the temperature increase, the PP microporous membranes were heat treated at different temperatures and the microstructure and properties were characterized using differential scanning calorimetry, scanning electron microscopy and atomic force microscopy. When the membranes were treated at temperatures lower than 130°C, no apparent dimension and microstructure changes were observed. The Gurley value (characterizing the air permeability) was kept around 240 s. When the membranes were treated at temperatures higher than 140°C, apparent dimensional shrinkage and the decrease or even disappearance of connecting bridges appeared. The corresponding Gurley value was increased to 1320 s, indicating worse air permeability property. The final heat-setting stage during the preparation of microporous membrane based on melt-stretching mechanism could stabilize the stretched connecting bridges and when the heat-treatment temperature was higher than heat-setting temperature, the crystals formed during heat setting could not support the stretched connecting bridges and resulted in the retraction or even disappearance of connecting bridges. These retracted connecting bridges were converted to new crystalline nodes sitting on both sides of separated lamellae.

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Microporous membranes obtained from polypropylene blend films by stretching

Cited by 183 publications

References 21 publications

Post-treatment effect on morphology and performance of polyurethane-based hollow fiber membranes through melt-spinning method

Post-treatment effect on morphology and performance of polyurethane-based hollow fiber membranes through melt-spinning method

Permeability in Clay/Polyesters Nano-Biocomposites

Influence of heat-treatment temperature on the structure and properties of polypropylene microporous membrane

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