26型/246型氟橡胶多段硫化机理及结构与性能

doi:10.11896/cldb.20030136

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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 T_g 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 T_d increased significantly and tensile strength increased linearly.

Key words： fluoroelastomer multi-stage curing curing mechanism

Published: 01 July 2021

CLC number:

TQ333.93

Fund:National Natural Science Foundation Youth Fund of China (52003165), Doctoral Scientific Research Foundation of Liaoning Province (2019-BS-190), Educational Department Foundation of Liaoning Province (LQ2019005) and Innovative Group of Liaoning Education Department of China (LT2016013).

About author:: Donghan Li received his Ph.D. degree in vehicle ope-ration engineering from Dalian Maritime University (DMU) in 2018. He is currently a lecturer in College of Materials Science and Engineering, Shenyang University of Chemical Technology and participates in the Liao-ning Provincial Key Laboratory of Rubber & Elastomer. His research interests are polymer preparation and application technology, including design, preparation, functionalization, curing, structures and properties of high fluorine-containing oligomers, etc. He has published more than 20 papers in domestic and foreign academic journals and 4 patents have been granted.
Qinghong Fang is currently a professor in College of Materials Science and Engineering, Shenyang University of Chemical Technology and Liaoning Provincial Key Laboratory of Rubber & Elastomer. He is mainly engaged in the teaching and research of polymers and composite materials. He has published 200 papers in various publications at various levels, and many of them have been accepted by EI, and SCI and 17 patents have been granted. Since 2002, he has undertaken and participated in 10 State Key Research and Development Projects, the National Natural Science Foundation of China, provincial and municipal research projects and enterprise Projects.He is currently the vice chairman of rubber institute, Chemical Industry and Engineering Society of China.

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	LI Donghan
	DUAN Jiayu
	ZHANG Chao
	XU Zhiyu
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Cite this article:

LI Donghan,DUAN Jiayu,ZHANG Chao, et al. Multi-stage Curing Mechanisms, Structure and Properties of 26/246 Fluoroelastomers[J]. Materials Reports, 2021, 35(12): 12202-12208.

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http://www.mater-rep.com/EN/10.11896/cldb.20030136 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12202

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