Biobased Dynamic Polymer Networks with Rapid Stress Relaxation

编号 020031202

推送时间 20211011

研究领域 林产化工 

年份 2021 

类型 期刊 

语种 英语

标题 Biobased Dynamic Polymer Networks with Rapid Stress Relaxation

来源期刊 ACS Sustainable Chemistry & Engineering

期 第312期

发表时间 20210810

关键词 dynamic polymer networks;  epoxidized soybean oil;  hydroxyl-functionalized silica;  stress relaxation;  mechanical properties; 

摘要 Dynamic polymer networks (DPNs) from epoxidized soybean oil (ESO) that incorporate dual dynamic exchange reactions (dual-DERs) and hydroxyl-functionalized silica (HO-SiO2) reinforcement are shown to exhibit rapid stress relaxation and excellent mechanical properties. A disulfide-containing carboxylic acid was used to synthesize the ESO DPNs by simultaneous disulfide metathesis and transesterification reactions that are found to markedly increase the rate of stress relaxation of the networks. HO-SiO2?was used to enhance the mechanical properties while further increasing the rate of stress relaxation. Optimal performance of the ESO/SiO2?DPNs was found at a 3 wt % HO-SiO2?content. In comparison with the neat ESO DPNs, the characteristic stress relaxation time (τ*) of the ESO/SiO2-3 DPNs decreased from 1494 to 898 s at 170 °C. The tensile strength and elongation at break, on the other hand, increased by 150 and 113%, respectively. ESO/SiO2-3 DPNs also show excellent self-healing, welding, and recycling properties that are desirable for reuse.

服务人员 尚玮姣

服务院士 宋湛谦

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