氨解
聚氨酯
极限抗拉强度
材料科学
天然橡胶
复合材料
胺气处理
抗撕裂性
聚合物
聚酯纤维
抗剪强度(土壤)
填料(材料)
有机化学
化学
土壤科学
土壤水分
催化作用
环境科学
作者
Qianqian Wang,Kuanfa Hao,Xiurui Guo,Fumin Liu,Xu Yan,Shouyun Guo,Lichen Bai,Gong‐Xu Liu,Lianen Qu,Miaomiao Liu,Lanhui Guo,Haichao Liu
标识
DOI:10.1016/j.jclepro.2022.135421
摘要
Rubber and polyurethane are polymers that are widely used but difficult to decompose in the natural environment. In this work, polyurethane aminolysis products (PAPs) are used to assist in the devulcanization of waste rubbers for the first time. The amine groups contained in PAPs can couple with the radicals generated by the scissions of crosslink bonds under the action of mechanical shear force, enhance the degree of devulcanization, and thus improve the mechanical properties of the reclaimed rubbers (RRs). The addition of PAPs can also shorten the optimum cure time of the RRs and improve the crosslink density and hardness of the RR re-vulcanizates. Using 1.8 phr of lower-layer PAPs prepared at 120 °C, the RR re-vulcanizate exhibit a tensile strength of 16.48 MPa, an elongation at break of 330.2%, and a tear strength of 48.5 MPa. This method realizes the dual high-value recycling of waste polyurethanes and rubbers, exhibiting bright application prospects.
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