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

Structure–Property Relationships of Elastomeric Vinylogous Urethane Thermosets and Their Application as Closed-Loop Recyclable Strain Sensors DOI Creative Commons
Youwei Ma, Francesco Stellacci

Macromolecules, Journal Year: 2025, Volume and Issue: 58(4), P. 1923 - 1934

Published: Feb. 5, 2025

Developing closed-loop recyclable thermosets and understanding their structure–property relationships are essential steps in advancing a circular materials economy. Here, we present vinylogous urethane (VU) thermoset with recyclability, synthesized through the reaction of polytetrahydrofuran bisacetoacetate (aPTHF) tris(2-aminoethyl)amine (TREN). These VU polymers exhibit high elasticity, only 3–9% residual strain observed after cyclic tensile testing at maximum 100%, depending on molecular weight aPTHF network cross-link density. The two structural parameters also allow modulation mechanical stress-relaxation properties elastomers. To investigate hydrolysis linkages within hydrophobic matrix, employed heterogeneous system using biphasic mixture HCl CDCl3. Our findings show that VUs remain stable pure water but can be dissociated under acidic conditions, dissociation rate accelerated higher temperatures and/or presence concentrations. detailed investigations indicate potential elastomers as sustainable substrates for wearable sensors. We therefore conduct case study synthesizing sensor incorporation multiwalled carbon nanotubes (MCNs) into elastomer matrix. robustly detect various movements. Moreover, treatment both neat polymer composite diethyl ether solvent allows excellent recovery (>90%) TREN (86%), without discernible damage to MCNs reclaimed from latter.

Language: Английский

Citations

2
Next-generation solar energy: Progress, stability, and prospects of polymer-modified Perovskite solar cells; A review DOI
Pei Zhang,

Huanggen Yang,

Qi Zheng

et al.

International Journal of Hydrogen Energy, Journal Year: 2025, Volume and Issue: 106, P. 1088 - 1113

Published: Feb. 8, 2025

Language: Английский

Citations

1
Recent Advances in the Chemical Recycling of Polyamide for a Sustainable Circular Economy DOI
Yirong Feng, Xiangchun Quan, Qingya Wang

et al.

Industrial & Engineering Chemistry Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 27, 2025

Language: Английский

Citations

0
Linear and Network-Forming Acetal Polymerization of Multifunctional Alcohols with Dichloromethane for Degradable and Recyclable Materials DOI
Joshua T. Kamps, Bruce E. Kirkpatrick, Sean P. Keyser

et al.

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

Published: Jan. 29, 2025

Language: Английский

Citations

0
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

0
Clusterization-triggered room-temperature phosphorescent synthetic polymeric materials DOI

Wenya Yan,

Peixuan Dong,

Qiyu Zhang

et al.

Coordination Chemistry Reviews, Journal Year: 2025, Volume and Issue: 535, P. 216629 - 216629

Published: March 28, 2025

Language: Английский

Citations

0
Synergetic “amine scissors” break down cured epoxy resins with nearly 100% degradation efficiency DOI

Furong Xie,

Rong Chen,

Chao Deng

et al.

Chemical Engineering Journal, Journal Year: 2025, Volume and Issue: unknown, P. 161175 - 161175

Published: March 1, 2025

Language: Английский

Citations

0
Viscoelastic Supramolecular Networks Based on Guanidinium‐Oxyanion Interactions DOI

Oliver G. Venablerose,

Evan B. Van Pelt,

Ava L. DeKoekkoek

et al.

Journal of Polymer Science, Journal Year: 2025, Volume and Issue: unknown

Published: April 25, 2025

ABSTRACT We describe the synthesis and characterization of supramolecular networks based on charge‐assisted hydrogen bonding interactions guanidinium oxyanion functionalities. Although they are constructed entirely small‐molecule components, these materials display properties such as a glass transition time‐ temperature‐dependent viscoelastic rheological behavior. These can be tuned by choice each network component: T g varies over 50°C in studied networks, relaxation times scaled with changes to . However, inherently degradable thermally reversible no covalent macromolecular structure is formed.

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