Lei, Qin yang

Lyu, Bin

Ma, Jian zhong

Shi, Lei

Thakur, Vijay Kumar

Zhai, Meng jiao

Zhang, Lei

Zhang, Shu tong

Zhang, Yue hong

Zhao, Shun hua

English

Vitrimers with reversible cross-links are emerging promising sustainable materials with reprocessability and recyclability. Here, castor oil-based epoxy resin (EMCO) with epoxy group and carbon-carbon double bonds was prepared through a two-step process and then cured with itaconic acid (IA) through epoxy-acid ring-opening reaction and free radical polymerization to fabricate fully bio-based epoxy vitrimers containing reversible transesterification bond. The thermal-mechanical properties, reprocessability, repairability, and recyclability could be balanced by varying the molar ratio of EMCO to IA. When the carboxyl group/epoxy group molar ratio reached 1.0, the EMCO-IA1.0 vitrimer exhibited the highest tensile strength of 14.39 MPa and Tg of 52.95 °C. Moreover, the vitrimer can be effectively remodeled (2 h at 180 °C) to prepare films and self-healing thanks to a rapid and mild stress relaxation process (2.56 min at 110 °C) and low activation energy (60.94 kJ·mol−1). More significantly, EMCO-IA vitrimer could be degraded in ethanol solution and recycled to prepare films and also exhibited excellent UV blocking ability. Overall, the EMCO-IA vitrimer can achieve a highly efficient closed-loop recycling without significantly sacrificing the mechanical properties, which can extend the service life and facilitate the sustainable development of the castor oil-based polymeric material.</p

SRUC - Scotland's Rural College

Sustainable castor oil-based vitrimers:Towards new materials with reprocessability, self-healing, degradable and UV-blocking characteristics

https://pure.sruc.ac.uk/files/62147876/1_s2.0_S0926669022016934_main.pdf

Sustainable castor oil-based vitrimers:Towards new materials with reprocessability, self-healing, degradable and UV-blocking characteristics

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SRUC - Scotland's Rural College