Gas Permeation and Barrier Properties of Liquid Crystalline Polymers

Ando, Seiichiro; Sato, Shuichi; Nagai, Kazukiyo

doi:10.1007/978-3-030-43350-5_67

Cited by 3 publications

(1 citation statement)

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“…In the meantime, long branched or microcross-linked structure hinders the crystal growth and leads the formation of an imperfect crystalline structure. Both the crystallinity of the polymer and the morphology of the crystals (such as the ratio of crystal width to thickness) will reduce the gas permeability and improve the barrier property of polymer. − Therefore, the reduced crystallinity of the modified TPAE may be more conducive to the volume recovery of the foam after shrinkage.…”

Section: Resultsmentioning

confidence: 99%

Study on Chain Extension Blending Modification and Foaming Behavior of Thermoplastic Polyamide Elastomer

et al. 2023

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In order to improve the melt foaming properties of thermoplastic polyamide elastomers and reduce the shrinkage rate of foamed materials, acid anhydride chain extenders SMA (styrene maleic anhydride copolymer) are used in this paper to in situ reactive blending thermoplastic polyamide elastomers (TPAE) and polyamide 6 (PA6). The rheological and crystalline properties of the modified samples were characterized by a rotational rheometer and differential scanning calorimeter, and the melt batch foaming experiment with CO 2 as the foaming agent was carried out. The results showed that the melting enthalpy of modified TPAE reduced with the addition of content of PA6, which implied that the crystallinity of the hard phase of the system was depressed. Nevertheless, the reduction of crystallinity was beneficial to improve the penetration of gas and reduce the effect of the pressure difference inside and outside the cell on foam shrinkage. Additionally, the microcross-linked structure formed with the increase of PA6 content enhanced the storage modulus of modified TPAE, which could accelerate recovery of strain. The foaming temperature zone and recovery performance of all modified TPAE samples were significantly improved. The overall shrinkage rate was reduced to less than 10%, the maximum expansion ratio could reach 11–13 times with a more complete and uniform cell structure, and the resilience was improved by about 12%.

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Section: Resultsmentioning

confidence: 99%

Study on Chain Extension Blending Modification and Foaming Behavior of Thermoplastic Polyamide Elastomer

et al. 2023

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Fabrication of PSf/P84-blended membranes with low P84 content: Characteristics and gas separation performance

Kayadoe,

Widiastuti,

Gunawan

et al. 2024

Case Studies in Chemical and Environmental Engineering

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The Effect of Solution Casting Temperature and Ultrasound Treatment on PEBAX MH-1657/ZIF-8 Mixed Matrix Membranes Morphology and Performance

et al. 2022

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Approximately two-thirds of anthropogenic emissions causing global warming are from carbon dioxide. Carbon capture is essential, with membranes proving to be a low cost and energy-efficient solution to alternative technologies. In particular, mixed matrix membranes (MMMs) can have higher permeability and selectivity than pure polymer membranes. The fabrication conditions affect the formation of defects within the membranes. In this work, MMMs were created using a PEBAX MH-1657 polymer and a ZIF-8 filler. The effect of casting plate temperature, varying from −5 °C to 50 °C, and the effect of ultrasound treatment time (80–400 min) and method (filler solution only, filler and polymer combined solution only and filler solution followed by combined solution) were investigated, aiming to reduce defect formations hence improving the performance of the MMMs. SEM images and permeation tests using pure CO2 and N2 gas, replicating flue gas for carbon capture, were used to investigate and compare the membranes morphology and performance. The results indicated that the MMMs maintained their permeabilities and selectivities at all tested casting temperatures. However, the neat PEBAX membranes demonstrated increased phase separation of the polyamide and polyether oxide phases at higher temperatures, causing a reduction in permeability due to the higher crystallinity degree, confirmed by DSC experiment. The MMMs fabricated at low ultrasound times displayed a large amount of aggregation with large particle size causing channeling. At high ultrasound times, a well-dispersed filler with small filler diameters was observed, providing a high membrane performance. Overall, defect-free membranes were successfully fabricated, leading to improved performance, with the best membrane resulting from the longest ultrasound time reaching the Robeson bound upper limits.

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Gas Permeation and Barrier Properties of Liquid Crystalline Polymers

Cited by 3 publications

References 100 publications

Study on Chain Extension Blending Modification and Foaming Behavior of Thermoplastic Polyamide Elastomer

Study on Chain Extension Blending Modification and Foaming Behavior of Thermoplastic Polyamide Elastomer

Fabrication of PSf/P84-blended membranes with low P84 content: Characteristics and gas separation performance

The Effect of Solution Casting Temperature and Ultrasound Treatment on PEBAX MH-1657/ZIF-8 Mixed Matrix Membranes Morphology and Performance

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