One-step reactive processing of vitrimeric thermoplastic polyolefin elastomer with greatly improved thermo-mechanical property

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

doi:10.1016/j.polymer.2023.126185

Cited by 7 publications

(2 citation statements)

References 48 publications

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“…When the temperature rises, POE is excessive to the highly elastic state, because the chain segment begins to move, while the viscosity of the system is still large, the chain segment movement is subject to frictional resistance is relatively large, so the highly elastic deformation significantly lags behind the stress changes, resulting in large internal dissipation. When the temperature rises again, although the deformation is large, the chain segments move more freely and the internal consumption becomes smaller. , At the same time, the PW in the composite material gradually melts as the temperature rises, which is a major reason for the FPCM’s possessing flexibility. When the temperature reaches 40 °C, the storage modulus of FPCM is close to zero, which indicates that FPCM is fully flexible and elastic at this point.…”

Section: Resultsmentioning

confidence: 99%

“…When the temperature rises again, although the deformation is large, the chain segments move more freely and the internal consumption becomes smaller. 38,39 At the same time, the PW in the composite material gradually melts as the temperature rises, which is a major reason for the FPCM's possessing flexibility. When the temperature reaches 40 °C, the storage modulus of FPCM is close to zero, which indicates that FPCM is fully flexible and elastic at this point.…”

Section: Photothermic Conversion Capacitymentioning

confidence: 99%

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A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

Huang,

Zou,

Chen

et al. 2024

ACS Sustainable Chem. Eng.

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In recognition of their excellent capacity for regulating thermal energy storage and release, phase change materials (PCMs) have been rediscovered and received growing significance in advanced solar energy storage and battery thermal management (BTM). Nevertheless, their insufficient thermal conductivity, poor shape stabilization, and high rigidity hinder their application in BTM systems. Herein, we reported a novel stable ordinary temperature flexible phase change material (FPCM) basis of paraffin wax (PW), polyolefin elastomer (POE), and expanded graphite (EG), which efficiently solves the aforementioned problem. And then, through flexibility, the FPCM was smartly mounted on the power batteries by overfilling, making the components compact and efficient. Thermal contact resistance (TCR) while operating the battery pack could be decreased by the flexible wrapping of the FPCM. Results show that the above BTM assembly effectively reduced the TCR to 0.28 °C/W. This FPCM-based reactive cooling BTM ensures that the temperature of the battery pack is kept under a safe temperature (55 °C) at all times. With the effect of EG, the prepared FPCM exhibits a substantial improvement in thermal conductivity, achieving 1.929 W/mK, as well as a prominent photothermal efficiency of conversion (91.2%). Notably, its ultraflexibility, high thermal conductivity, and excellent latent heat provide a convenient way for the thermal management packaging of complex and multimodel electronic devices.

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Section: Resultsmentioning

confidence: 99%

Section: Photothermic Conversion Capacitymentioning

confidence: 99%

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

Huang,

Zou,

Chen

et al. 2024

ACS Sustainable Chem. Eng.

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Reactive melt‐grafting of maleic anhydride onto olefin block copolymer toward high‐performance polar polyolefin thermoplastic elastomer

Kou,

Ma,

et al. 2024

Polymer International

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The block structure of Olefin Block Copolymer (OBC) elastomer gives it good elasticity and heat‐resistance in relative to other polyolefin elastomers. However, the non‐polar nature of OBC chains limits its comprehensive properties like dyeing and toughening for polar engineering plastics. In this work, Maleic Anhydride (MA) and Dicumyl Peroxide (DCP) were selected as a typical polar monomer and a radical initiator to modify the polarity of OBC elastomer. During the melt‐grafting process, DCP content was tuned to optimize the grafting efficiency while the MA‐to‐OBC ratio was fixed as 5 wt%. It was found that all the melt‐grafting reactions show high‐efficiency and can be finished in 3 min at 170 °C. With the increase of DCP content, the estimated grafting degree of OBC‐g‐MA elastomer increases from 0.40% to 1.16% along with increased gel content from 4.27% to 22.44%. A suitable grafting process was obtained with DCP content of 3.0 wt% by balancing grafting efficiency and final mechanical properties. The optimized OBC‐g‐MA elastomer with grafting degree of 0.92% has a mechanical strength of 17.15 MPa, Young's modulus of 26.35 MPa, elongation of 1564%, and strain recovery of 59.73%. Additionally, contact angle test shows that polar grafting can increase surface hydrophilicity while excessive crosslinking promotes hydrophobicity. Therefore, our work has demonstrated the feasibility of reactive melt‐grafting method to prepare OBC‐g‐MA elastomer and can also provide processing reference for other chemical functionalization of polyolefin thermoplastic elastomers.This article is protected by copyright. All rights reserved.

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Silicone‐containing polyurea elastomer possessing main‐chain boron–oxygen bonds with delayed stress relaxation and improved adhesive properties

Zhang,

Xiong,

Wang

et al. 2024

Polymer International

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Polyurea (PU) elastomers have attracted considerable attention in the field of protective polymeric coatings. In this work, a dithiol‐terminated boronic ester was synthesized and used to incorporate dynamic boron–oxygen (B–O) bonds in the PU main chain based on thiol isocyanate while amino‐terminated polydimethylsiloxane (PDMS) was introduced to retain good chain flexibility. The modified PU elastomer was found to have a microphase‐separated structure in which the hard blocks served as physical crosslinks. The glass transition temperature (Tg) slightly increases when dynamic B–O bonds exist while further introduction of PDMS soft segment can lower Tg to −55.63 °C. The introduction of dynamic B–O bonds and diminished hydrogen bonding led to a decrease in mechanical strength and elongation at break. Interestingly, the simultaneous incorporation of PDMS and dynamic B–O bonds is favorable for strain rate dependence and suppressing stress relaxation. The potential for bond‐exchange interactions between the dynamic B–O bonds and hydroxyl groups on metal surfaces substantially improved the adhesion of the PU elastomer to metal substrates. Therefore, our work can offer valuable insights for the structural design of functional PU coatings tailored for anti‐impact applications. © 2024 Society of Chemical Industry.

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One-step reactive processing of vitrimeric thermoplastic polyolefin elastomer with greatly improved thermo-mechanical property

Cited by 7 publications

References 48 publications

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

A Novel Room-Temperature Flexible Phase Change Material for Solar Energy Photothermal Conversion and Battery Thermal Management

Reactive melt‐grafting of maleic anhydride onto olefin block copolymer toward high‐performance polar polyolefin thermoplastic elastomer

Silicone‐containing polyurea elastomer possessing main‐chain boron–oxygen bonds with delayed stress relaxation and improved adhesive properties

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