Multi-stage Curing Mechanisms, Structure and Properties of 26/246 Fluoroelastomers
LI Donghan1,2, DUAN Jiayu2, ZHANG Chao2, XU Zhiyu2, FANG Qinghong1,2
1 College of Materials Science and Engineering, Shenyang University of Chemical Technology, Shenyang 110142, China 2 Liaoning Provincial Key Laboratory of Rubber & Elastomer, Shenyang University of Chemical Technology, Shenyang 110142, China
Abstract: The fluoroelastomers 2601(2601FKM) and 2461(2461FKM) were selected as raw materials and N, N′-disubcinnamyl-1,6-hexylenediamine was chosen as vulcanizator agents to prepare fluoroelastomer blends with excellent processing, moderate strength and better performance at low temperature. Firstly, the evolution of chain structures of 2601FKM, 2461FKM and their blends were analyzed by Fluorine Solid-state NMR (19F MAS-NMR) and Atteuated total reflectance/Fourier transform infrared (ATR-FTIR), then the mechanisms of multi-stage curing were proposed. Secondly, the curing characteristics and crosslink density of 2601FKM/2461FKM blends were tested and analyzed, the thermal and tensile properties of the press and post cure products were compared by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and tensile tests. The results revealed that crosslinking densities of 2601FKM and 2461FKM post cure products were higher than that of press cure, further the crosslinking density of 2461FKM post cure product was higher than that of 2601FKM about 1.67 times; when the blending ratio of 2601FKM/2461FKM was 40/60, the Tg of press cure product was -16.5 ℃ lower than press cure product which was -12.1 ℃ that exhibit better low temperature performance; with the increase of the amount of 2461FKM in blends, curing products Td increased significantly and tensile strength increased linearly.
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2021, Vol. 35 
