Resilient and reprocessable physical gels based on crystalline olefin block copolymer elastomer and mineral oil toward optically transparent electronic packaging

Zhao, Yongsheng; Li, Jialiang; Ma, Yuqi; Wang, Yangwei; Jiang, Chaobo; Yan, Haonan; Hao, Rui; Qin, Jianbin; Shi, Xuetao; Zhang, Guangcheng

doi:10.1016/j.polymer.2023.126161

Cited by 2 publications

(1 citation statement)

References 36 publications

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“…Olefin block copolymers (OBC) are thermoplastic elastomers with alternating blocks of crystalline hard segments (with low 1-octene content) and rubbery soft segments (with high 1-octene content) developed by Dows through shuttling polymerization, , in which the hard segments can develop into spherulites even when the overall crystallinity is as low as 7% in OBC . Therefore, OBC exhibits excellent resilience, weather resistance, good compression set, and notably enhanced heat resistance that can be used in many fields such as cushion, electronic packaging, smart materials, and battery thermal management . It has also been reported that OBC can generate mesophase separated structure with domain spacings of 80–258 nm and can be used as photonic elastomers with selective visible light transmitted. , In our previous work, we found that the micro-crosslinking OBC exhibited good foamability because the reformed crystal regions could effectively suppress the shrinkage of the foams after foaming, and the foam with a density as low as 0.025 g/cm 3 was achieved successfully thanks to its excellent crystallization .…”

Section: Introductionmentioning

confidence: 99%

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming

Zheng,

Guo,

Pei

et al. 2024

ACS Appl. Polym. Mater.

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Elastomer foams with customized multimodal cellular structures have great application requirements in advanced fields, but a simple and practical way to realize it needs to be further studied. Herein, a strategy of presetting cells into elastomers before supercritical CO 2 foaming was introduced to customize the cellular structures. Typically, taking olefin block copolymers (OBC, a thermoplastic elastomer with crystalline hard segments and rubbery soft segments) foams as an example, bimodal, sandwich, and gradient multimodal cellular structures were successfully prepared. The interaction between preset cells and newly nucleated cells during foaming had been systematically studied by controlling the morphology of preset cells and foaming conditions. It was found that the configuration of preset cells and the nucleation rate of small cells in OBC foams had a significant impact on their cellular structures. Specifically, the bimodal cellular structures can improve the expansion ratio and elasticity of OBC foams, and their rebounding ability could be improved by 14%, while their energy loss coefficient would be decreased by 17% (compared to homogeneous ones in this study). Furthermore, the feasibilities of this strategy in other elastomer foams (like POE, EPDM, and EVA foams) with bimodal cellular structures were also verified, which was expected to promote the development of high-performance elastomer foams.

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Section: Introductionmentioning

confidence: 99%

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming

Zheng,

Guo,

Pei

et al. 2024

ACS Appl. Polym. Mater.

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Fundamental Principles and Emerging Opportunities for Selectively‐Solvated Block Copolymer Networks in Nonpolar Media: A Perspective

McFeaters,

Spontak

2024

Advanced Physics Research

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Block polymers remain an extensively studied class of macromolecules due to their ability to self‐organize spontaneously as a result of microphase separation into a variety of ordered nanostructures, depending on the number of contiguous sequences (“blocks”) present and their sequential arrangement. These polymers are classified as multifunctional since they exhibit two or more different property sets during application. In this work, the focus is on bicomponent block copolymers composed of soft and hard segments arranged as linear triblock or higher‐order multiblock copolymers and possessing the properties of a thermoplastic elastomer (TPE). Of particular interest are selectively‐solvated TPEs, designated as TPE gels (TPEGs), with precisely‐ and composition‐tunable properties. An important aspect of TPEs and their TPEG analogs is their elasticity, which reflects the ability of the soft block(s) to form a contiguous molecular network connected by dispersed microdomains composed of the hard block. Here, the origins of microphase separation and network formation in styrenic TPEs and TPEGs are explored, and experimental, theoretical, and simulation results are examined to elucidate chemistry‐structure‐property‐processing (CSPP) relationships in these self‐networking materials. Once such relationships are established, several unconventional technologies that can directly benefit from TPEGs, along with TPEGs fabricated from TPEs possessing different chemical moieties, are likewise considered.

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Resilient and reprocessable physical gels based on crystalline olefin block copolymer elastomer and mineral oil toward optically transparent electronic packaging

Cited by 2 publications

References 36 publications

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming

Fundamental Principles and Emerging Opportunities for Selectively‐Solvated Block Copolymer Networks in Nonpolar Media: A Perspective

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Resilient and reprocessable physical gels based on crystalline olefin block copolymer elastomer and mineral oil toward optically transparent electronic packaging

Cited by 2 publications

References 36 publications

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO2 Foaming

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO2 Foaming

Fundamental Principles and Emerging Opportunities for Selectively‐Solvated Block Copolymer Networks in Nonpolar Media: A Perspective

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Product

Resources

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Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming

Customized Multimodal Cellular Elastomer Foams through Presetting Cells before CO₂ Foaming