INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2025
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IF 3.9
Chaobo Jiang,Haonan Yan,Ce Wang,Shilong Zhang,Yanling Zhu,Hua Deng,Yongsheng Zhao,Guangcheng Zhang
The incorporation of dynamic covalent bonds (DCBs) has transformed thermoplastic elastomers into vitrimers. However, it still remains a challenge to solve the trade-off between mechanical properties and processability of vitrimer-like elastomers. In this work, poly(styrene–butadiene-styrene) (SBS) vitrimer with dual dynamic networks were prepared through thiol–ene click chemistry and reactive processing. By grafting 3-mercaptopropionic acid (MPA) onto SBS and subsequent cross-linking with zinc oxide and BDB, dynamic networks with zinc ion(Zn2+) coordination and dynamic boronic ester bonds were established. The structure and mechanical performance could be tailored by adjusting the ratio of the two networks. When increasing Zn2+ coordination bonds along with fixed BDB content, the gel content of SBS vitrimers varies from 30.62% to 69.54%. The dual-network sample demonstrated a synergistic effect with the highest elongation at break (526.41%) and a tensile strength of 13.40 MPa, outperforming single-network samples. All the SBS vitrimers show Arrhenius-type stress relaxation behavior, and the activation energy for dynamic bond exchange energy (Ea) of SBS with dual dynamic network was 76.69 kJ/mol. After three reprocessing cycles, the elastomer retained over 80% of its original mechanical properties. Therefore, this work offers a promising strategy for fabricating elastomers with excellent mechanical performance and recyclability, which is expected to have a significant impact on the design and preparation of high-performance elastomers.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2024
·
IF 3.8
Shilong Zhang,Chaobo Jiang,Ce Wang,Jialiang Li,Yuqi Ma,Yanling Zhu,Hua Deng,Yongsheng Zhao,Guangcheng Zhang
As a traditional block copolymer-type elastomer, the poly(styrene–butadiene–styrene) SBS elastomer has limited properties like weak heat/solvent/creep resistance and adhesive performance. In this work, the “melt-blending and ultraviolet (UV) post-treatment” method was used to activate a thiol–ene reaction between thiol-terminated boronic ester cross-linkers (BDB) and vinyl groups of SBS chains. In this way, it can effectively incorporate a dynamic boron–oxygen (B–O) network into SBS elastomers. When increasing the BDB content from 1 to 10 wt %, the gel content of SBS vitrimers varies from 18.76 to 83.91%. At the same time, the glass transition temperature (Tg) of the PB phase in SBS vitrimers increases from −87.87 to −73.25 °C and a rubbery plateau appears instead of an instant rupture when the temperature rises above the Tg of the PS phase. The stress relaxation behavior of all SBS vitrimers shows an Arrhenius-type temperature dependence, and the estimated bond-exchange activation energy (Ea) of SBS-BDB10 was 52.28 kJ/mol. Compared to the pure SBS elastomer, SBS vitrimeric elastomers show an increased Young’s modulus, creep resistance, and self-healing properties and maintain their rubber elasticity. Furthermore, the adhesive property to the metal was notably improved, achieving a lap-shear strength of up to 1.83 MPa. Therefore, it is demonstrated to obtain good reprocessability and improved physical properties via fabricating SBS vitrimers with dynamic B–O networks.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
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IF 3.573
Liangfeng Xiao,Weifeng Liu,Jinhao Huang,Hongming Lou,Xueqing Qiu
The technical enzymatic hydrolysis lignin (EHL) and alkali lignin (AKL) were pretreated via alkaline depolymerization and organic solvent extraction process, respectively. The molecular weight of lignin was lowered and the molecular weight distribution was narrowed, while the content of phenolic hydroxyl group increased after the pretreatment of alkaline depolymerization or solvent extraction. The lignin extracted with ethyl acetate got the lowest molecular weight and highest phenolic hydroxyl group content, showing even better free radical scavenging ability than the commercial Irganox1010. Lignin/SBS elastomer composites were prepared with even dispersion of lignin in the SBS matrix with an average particle size close to 40 nm. It was demonstrated that the alkali lignin extracted with ethyl acetate showed the best improvement on the antioxidant performance of SBS and was comparable to that of Irganox1010 in the SBS elastomer, showing great application potential.
研究领域:
材料科学
·
化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
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2022
·
IF 5.546
Liqian Zhu,Li Xu,Suyun Jie,Bo-Geng Li
As the universal thermoplastic elastomers, poly(styrene- b -butadiene- b -styrene) (SBS) possesses good rubber elasticity and plasticity. However, the weak intermolecular forces upon which physical crosslinking relies also lead to unideal heat resistance, solvent resistance, and mechanical properties. Therefore, a massive challenge for developing SBS lies in the balance between performance and recyclability. Vitrimers are an emerging class of polymers with a crosslinked network containing dynamic covalent bonds. Herein, we demonstrated the preparation of SBS vitrimers based on disulfide exchange with high performance via epoxidation and esterification reactions. The introduction of chemical crosslinking significantly improved their mechanical properties and environmental resistance, especially solvent and heat resistance. Compared with pristine SBS, the tensile strength of SBS vitrimers could be increased from 1.9 MPa to 14.4 MPa without sacrificing the elongation at break. In the meantime, the dynamic nature enabled by disulfide exchange retained the recycling ability and endowed SBS vitrimers with some smart responses, including shape memory and self-healing properties. Furthermore, SBS vitrimers exhibited stronger adhesion in contrast with pristine SBS. This work provides a simple strategy for designing SBS networks with enhanced performance and good recyclability.
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）