Constructing High‐Performance Composite Epoxy Resins: Interfacial π‐π Stacking Interactions‐Driven Physical Rolling Behavior of Silica Microspheres DOI Open Access

Qiaolin Tang,

Yanqi Li,

Jingya Liu

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

The intrinsic compromise between strength and toughness in composite epoxy resins significantly constrains their practical applications. In this study, a novel strategy is introduced, leveraging interfacial π-π stacking interactions to induce the "rolling behavior" of microsphere fillers, thereby facilitating efficient energy dissipation. This approach corroborated through theoretical simulations experimental validation. resulting resin demonstrates an impressive 49.8% enhancement remarkable 358.9% improvement compared conventional resins, accompanied by substantially reduced hysteresis. Moreover, system achieves reversible closed-loop recyclability rapid repair capabilities. preliminary demonstration "force-temperature equivalence" further establishes pathway for design high-performance materials.

Language: Английский

Circular Polymer Designed by Regulating Entropy: Spiro-Valerolactone-Based Polyesters with High Gas Barriers and Adhesion Strength DOI

Cui-Ting Han,

Kai Ma, Zhen Zhang

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Enthalpy is often the focal point when designing monomers for polymer circularity, but much less explored on how entropy can be exploited to create polymers with synergistic circularity and properties. Here, we design a series of spiro-lactones (SLs) closed-chain cycloalk(en)yl substituents at α,α-position δ-valerolactone (δVL), which, combined parent δVL gem-α,α-dialkyl-substituted open-chain alkyl groups, provide desired platform exploring circular by focusing change polymerization. These SLs exhibit finely balanced (de)polymerizability that regulated chiefly differentiation, allowing both facile synthesis polyester PSLs (Mn up 1000 kg mol–1) in living fashion selective depolymerization completely recover under mild conditions (using recyclable catalyst 100 °C). One such PSL semicrystalline (Tm = 134 °C), strong (ultimate strength 43 MPa), hard (modulus 1.85 GPa), modestly flexible. notable mechanical properties are bolstered its superior barriers oxygen moisture permeation compared common packaging materials. In addition, this postfunctionalized OH-containing shows higher adhesion than comparative commercial adhesives.

Language: Английский

Citations

2
Ultratough Thermoplastic Elastomers Based on Chemically Recyclable Cycloalkyl-Substituted Polyhydroxyalkanoates DOI
Hao‐Yi Huang, Lei Yang, Siqi Wang

et al.

Journal of the American Chemical Society, Journal Year: 2025, Volume and Issue: 147(9), P. 7788 - 7798

Published: Feb. 20, 2025

It remains a long-standing challenge for chemical recycling of polyhydroxyalkanoates (PHAs) to propiolactone-based monomers due the high ring strain and many inevitable side reactions. In this contribution, novel α-spiro-cyclohexyl-propiolactone (SHPL) has been designed with reactivity toward ring-opening polymerization even at catalyst loading <1 ppm. The resulting poly(3-hydroxy-2-spiro-cyclohexylpropionate) (P3HSHP) exhibited thermal stability Td 364 °C Tm 272 °C. Meanwhile, it could be depolymerized back SHPL in 86% yield without decarboxylation or elimination products. Notably, exploited construct high-performance thermoplastic elastomers (TPEs) via one-pot copolymerization ε-caprolactone (CL). Particularly, gradient P(CL2000-grad-SHPL500) showcased an ultimate tensile strength 58.8 ± 4.0 MPa, stretchability 1959 53%, record toughness 600 MJ/m3, elastic recovery (>90%). This superior performance advance development new sustainable TPEs.

Language: Английский

Citations

1
Tough and Closed‐Loop Recyclable Thermoplastic Elastomers From Sequential Ring‐Opening Copolymerization of Bio‐Renewable β‐Methyl‐δ‐Valerolactone and δ‐Valerolactone DOI Open Access
Xinxin Yu, Liying Wang, Min Zhang

et al.

Advanced Functional Materials, Journal Year: 2025, Volume and Issue: unknown

Published: Feb. 9, 2025

Abstract Despite the great successes achieved for closed‐loop recyclable polymers in last decade, thermoplastic elastomers (TPEs) with recyclability and good mechanical performances are largely underexplored. In this contribution, preparation of PδVL‐ b ‐PβMVL‐ ‐PδVL triblock copolymers via one‐pot sequential ring‐opening copolymerization bio‐renewable β‐methyl‐δ‐valerolactone (βMVL) δ‐valerolactone (δVL) is achieved. The obtained behave as TPEs that exhibit superior tensile strength toughness well comparable elasticity to most previously reported polyester‐based commercial styrenic copolymer‐based TPEs. Remarkably, these can be depolymerized recover pristine monomers a high yield by simply heating materials under reduced pressure presence stannous octoate catalyst. recovered separated or directly used prepare original TPEs, thus establishing life cycle.

Language: Английский

Citations

0
Circular polyester design by gem-heterodisubstitution: valerolactone-based polymers with high ductility and excellent strength DOI
Y. Pan, Xinlei Li,

Wulin Shang

et al.

Polymer Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 1, 2025

A series of α,α-heterodisubstituted δ-valerolactones (VL R1,R2 ) provide a desired platform for exploring circular polymer design by focusing on the asymmetric substitution monomers.

Language: Английский

Citations

0
Bio-based thermoplastic poly(ether-ester) elastomers from 2,5-thiophenedicarboxylic acid with high stiffness and elasticity DOI
Tao Yang, Jiyang Zuo, Fei Liu

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161856 - 161856

Published: March 1, 2025

Language: Английский

Citations

0
Sustainable and Eco-Compatible Copolyesters with Applicable Properties: Controlled One-Pot Synthesis and Chemically Closed-Loop Recycling DOI
Zhenghe Yang, Xiaoping Ouyang, Si‐Chong Chen

et al.

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: April 11, 2025

Language: Английский

Citations

0
β-Pinene-Based Polyester from Renewable Feedstock with Elastomeric Behavior DOI Creative Commons
Stefanie Pongratz, Moritz Kränzlein, Bernhard Rieger

et al.

Macromolecules, Journal Year: 2025, Volume and Issue: unknown

Published: April 17, 2025

Language: Английский

Citations

0
Direct Monomer Recovery from Ring-Closing Depolymerization of Thermosets DOI Creative Commons
Chihui Zheng, Gadi Slor, Youwei Ma

et al.

ACS Macro Letters, Journal Year: 2024, Volume and Issue: unknown, P. 1704 - 1710

Published: Dec. 7, 2024

Recovering monomers from the depolymerization of thermosets presents a significant challenge, which becomes even more daunting if one sets goal doing it directly, i.e., without complex chemical separation steps. To this end, we have synthesized new type polycarbonate thermoset by first copolymerizing alkyl cyclic carbonates (ACCs) with small amounts allyloxy (AoCCs), followed cross-linking resulting excess tetrathiol compounds under UV irradiation. These cross-linked polycarbonates demonstrate enhanced thermal and mechanical properties compared to their linear analogues, while maintaining polymers' capacity for ring-closing depolymerization. The process enables direct recovery ACC its dimer, bypassing steps that are commonly employed in recycling conventional chemically recyclable thermosets. yields range 74.7% 91.7% depending on ratios AoCC Furthermore, recovered can be repolymerized AoCCs leading same quality initially one.

Language: Английский

Citations

1
Constructing High‐Performance Composite Epoxy Resins: Interfacial π‐π Stacking Interactions‐Driven Physical Rolling Behavior of Silica Microspheres DOI Open Access

Qiaolin Tang,

Yanqi Li,

Jingya Liu

et al.

Advanced Materials, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 18, 2024

The intrinsic compromise between strength and toughness in composite epoxy resins significantly constrains their practical applications. In this study, a novel strategy is introduced, leveraging interfacial π-π stacking interactions to induce the "rolling behavior" of microsphere fillers, thereby facilitating efficient energy dissipation. This approach corroborated through theoretical simulations experimental validation. resulting resin demonstrates an impressive 49.8% enhancement remarkable 358.9% improvement compared conventional resins, accompanied by substantially reduced hysteresis. Moreover, system achieves reversible closed-loop recyclability rapid repair capabilities. preliminary demonstration "force-temperature equivalence" further establishes pathway for design high-performance materials.

Language: Английский

Citations

1