Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

Zhou, Jun-Hao; Tang, Li-Ming

doi:10.1007/s10118-024-3121-9

Chin J Polym Sci

2024

DOI: 10.1007/s10118-024-3121-9

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Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

Jun-Hao Zhou,

Li-Ming Tang

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Cited by 2 publications

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Reprocessable and Chemically Recyclable Polyester Elastomers via a Tandem Ring‐Opening Polymerization and Photo‐Crosslinking Strategy From Bio‐Renewable β‐Methyl‐δ‐Valerolactone

Zhang,

Liu,

Shen

2024

Journal of Polymer Science

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Due to the lack of effective physical reprocessing or chemical recovery capabilities, thermosetting polymers face long‐term post‐disposing problems. The introduction of dynamic covalent bonds can effectively combine reprocessing ability with typical robust properties of thermosetting polymer. However, after multiple reprocessing treatments, thermosets often suffer significant decrease in mechanical properties, so the chemical recycling and reuse is crucial and necessary for the sustainable development of thermosetting polymers. Herein, a series of polyesters PβMδVL‐TA with mono‐ or bis‐terminal cyclic disulfide bond was first synthesized via esterification between terminal hydroxyl of PβMδVL and carboxyl of thioctic acid (TA). Then, the thermosetting elastomer with both physical reprocessability and chemical recyclability was prepared by simple UV‐triggered ring‐opening polymerization of cyclic disulfide. By regulating cross‐linking sites and the molecular weight of the mono‐ or bis‐PβMδVL‐TA, such polyester elastomers exhibit good tensile strength and elasticity with elastic recovery can reach 98% after 10 cycles. Furthermore, the dynamic reaction of disulfide bonds induced by hot pressing and UV light enables multiple reprocessing of cross‐linked elastomers. Remarkably, the efficient chemical recycling of the elastomers was achieved to recover pristine βMδVL monomer with 90% yield in the presence of ZnCl2 as the catalyst at 130°C.

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Reprocessable and Chemically Recyclable Polyester Elastomers via a Tandem Ring‐Opening Polymerization and Photo‐Crosslinking Strategy From Bio‐Renewable β‐Methyl‐δ‐Valerolactone

Zhang,

Liu,

Shen

2024

Journal of Polymer Science

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Dynamic Covalent Bond-Based Polymer Chains Operating Reversibly with Temperature Changes

Roh,

Nam,

Nguyen

et al. 2024

Molecules

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Dynamic bonds can facilitate reversible formation and dissociation of connections in response to external stimuli, endowing materials with shape memory and self-healing capabilities. Temperature is an external stimulus that can be easily controlled through heat. Dynamic covalent bonds in response to temperature can reversibly connect, exchange, and convert chains in the polymer. In this review, we introduce dynamic covalent bonds that operate without catalysts in various temperature ranges. The basic bonding mechanism and the kinetics are examined to understand dynamic covalent chemistry reversibly performed by equilibrium control. Furthermore, a recent synthesis method that implements dynamic covalent coupling based on various polymers is introduced. Dynamic covalent bonds that operate depending on temperature can be applied and expand the use of polymers, providing predictions for the development of future smart materials.

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Investigation on UV-curing Reprocessable Thermosets Bearing Hindered Urea Bonds and Their Composites with Modified Zinc Oxide Nanoparticles

Cited by 2 publications

References 43 publications

Reprocessable and Chemically Recyclable Polyester Elastomers via a Tandem Ring‐Opening Polymerization and Photo‐Crosslinking Strategy From Bio‐Renewable β‐Methyl‐δ‐Valerolactone

Reprocessable and Chemically Recyclable Polyester Elastomers via a Tandem Ring‐Opening Polymerization and Photo‐Crosslinking Strategy From Bio‐Renewable β‐Methyl‐δ‐Valerolactone

Dynamic Covalent Bond-Based Polymer Chains Operating Reversibly with Temperature Changes

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