State-of-the-art, opportunities, and challenges in bottom-up synthesis of polymers with high thermal conductivity

Liu, Yurui; Zhou, Yijie; Yan, Xu

doi:10.1039/d2py00272h

Cited by 10 publications

(7 citation statements)

References 276 publications

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“…To the best of our knowledge, regarding thermal conductivity, compared to any reported LC epoxy bulk system, our LCEV has notably higher value. [50,51] In particular, considering that the LCEVs are a thermosetting vitrimer that can be reprocessed and can also be recycled, it is thought to be the only material that has both eco-friendliness and thermal conductivity that has not been reported.…”

Section: Recycling Of Cured Lcevmentioning

confidence: 99%

Reprocessable and Chemically Recyclable Hard Vitrimers Based on Liquid‐Crystalline Epoxides

Trinh

Yeo

2023

Advanced Materials

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The rapid increase in demand for recyclable and reusable thermosets has necessitated the development of materials with chemical structures that exhibit these features. Thus, functional mesogenic epoxide monomers bearing both ester and imine groups that can be vitrimerized and recycled are reported herein. The compounds show mesophase characteristics at 100–200 °C and can be converted into hard epoxides by a common curing reaction. The obtained hard epoxides have high isotropic thermal conductivity (≈0.64 W m−1 K−1), which is derived from their highly ordered microstructures. The cured products can be easily reprocessed through imine metathesis and transesterification, and decomposed products can be obtained through imine hydrolysis under acidic or basic conditions and subsequently be re‐cured. Surprisingly, recycled materials can be repeatedly reprocessed or chemically decomposed. The reprocessed materials retain the properties of their pristine counterparts, and the recycled products preserve the advantages of the hard thermosets without alteration to any of their unique properties. A dehydration reaction occurs between the residual hydroxyl groups during the re‐hardening, which dramatically increases the glass transition temperature by ≈60 °C. These reprocessable and recyclable vitrimers demonstrate the effectiveness and environmental friendliness of the molecular design strategy reported herein.

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Section: Recycling Of Cured Lcevmentioning

confidence: 99%

Reprocessable and Chemically Recyclable Hard Vitrimers Based on Liquid‐Crystalline Epoxides

Trinh

Yeo

2023

Advanced Materials

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“…72 Crystalline sulfurcontaining poly(α-olefin) (M-22) can be accessed by using the carbene-ligated scandium complex C-22/borate system, during which a highly syndiotactic (rrrr = 0.95) polymer with high melting temperature (91 °C) is obtained. 73 The half-metallocene titanium catalyst C-23 bearing the triethyloxyamine ligand promotes the polymerization of silyloxy-and amine-functionalized styrene M-23 and M-24 to give syndiotactic polymers. 74 Homopolymerization of 4-methylthiostyrene M-25 can be achieved with a very high syndioselectivity (rrrr > 0.99) under the catalysis of halfmetallocene rare earth metal catalysts C-24.…”

Section: Stereoselective Homopolymerization Of Polar Monomersmentioning

confidence: 99%

Stereoselective Copolymerization of Olefin with Polar Monomers to Access Stereoregular Functionalized Polyolefins

Jian

2022

Organic Materials

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Introducing polar functionalities to polyolefin such as polyethylene and polypropylene is highly desired for improving physical properties of the otherwise non-polar material. The synthesis of stereoregular functionalized polyolefins, however, has been a relatively underdeveloped area compared to that of functionalized polyethylene because of the lack of suitable catalysts that tolerate polar groups while possessing stereoselectivity. This review summarizes recent advances concerning the access to stereoregular functionalized polyolefins, including synthetic strategies such as post-functionalization, chain transfer and direct copolymerization methods. The focus of the review lies in the copolymerization approach, in which various polar comonomers and versatile stereoselective polymerization catalysts based on both early and late transition metals are involved. Polymer properties and potential applications for these materials are simply discussed.

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“…17,18 Therefore, the development of polymer matrices with high intrinsic T/C is necessary to improve the heat dissipation proficiency of such materials. [19][20][21] In organic polymers, heat transfer occurs through phonon vibration because of the absence of free electrons. The Debye equation expresses T/C values as follows: T/C = C p vl/3.…”

Section: Introductionmentioning

confidence: 99%

“…17,18 Therefore, the development of polymer matrices with high intrinsic T/C is necessary to improve the heat dissipation proficiency of such materials. 19–21…”

Section: Introductionmentioning

confidence: 99%

Enhancement of thermal conducting properties in epoxy thermoset systems using an aligned liquid-crystalline mesophase

Trinh,

Yeo

2024

Mater. Adv.

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State-of-the-art, opportunities, and challenges in bottom-up synthesis of polymers with high thermal conductivity

Abstract: In contrast to metals, polymers are predominantly thermal and electrical insulators. With their unparalleled advantages such as light weight, turning polymer insulators into heat conductors with metal-like thermal conductivity is...

Cited by 10 publications

References 276 publications

Reprocessable and Chemically Recyclable Hard Vitrimers Based on Liquid‐Crystalline Epoxides

Reprocessable and Chemically Recyclable Hard Vitrimers Based on Liquid‐Crystalline Epoxides

Stereoselective Copolymerization of Olefin with Polar Monomers to Access Stereoregular Functionalized Polyolefins

Enhancement of thermal conducting properties in epoxy thermoset systems using an aligned liquid-crystalline mesophase

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