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    					Toughening of vinyl ester resins by two-dimensional MXene nanosheets  | 
  					 
  					  										
						Yurun Dai1, Heng Fang2( ), Zong Lu1, Zhuohong Yang2, Yanying Wei1( ) | 
					 
															
						1. School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab of Green Chemical Product Technology, State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China 2. Key Laboratory for Bio-based Materials and Energy of Ministry of Education, College of Materials and Energy, South China Agricultural University, Guangzhou 510642, China | 
					 
										
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													     		                            						                            																	    Abstract  Two-dimensional nanosheets are highly effective tougheners for vinyl ester resins. The toughening effect is related to the high specific surface area and unique two-dimensional planar structure of the nanosheets. In this study, a coupling agent γ-(2,3-epoxypropoxy) propytrimethoxysilane (Kh-560) was used to modify MXene nanosheets (M-MXene) for use in toughening vinyl ester resin. The mechanical properties, including the tensile strength, flexural strength, Young’s modulus and elongation, of neat vinyl ester resin and vinyl ester resin modified with MXene and M-MXene were investigated. The results showed that modification significantly improved the mechanical properties of the vinyl ester resin. The tensile and flexural strengths of the MXene-nanosheet-modified vinyl ester resin were 27.20% and 25.32% higher, respectively, than those of the neat vinyl ester resin. The coupling agent improved the interfacial compatibility between the MXene nanosheets and vinyl ester resin, which resulted in the tensile and flexural strengths of the M-MXene-nanosheet-modified vinyl ester resin being 52.57% and 54.60% higher, respectively, than those of the neat vinyl ester resin for a loading quantity of nanosheets of only 0.04 wt %, which is economically viable. The main mechanisms by which the nanosheets toughen the resin are crack deflection and crack pinning. 
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															| Keywords 
																																																				MXene nanosheets  
																		  																																				2D material  
																		  																																				vinyl ester resin  
																		  																																				modification  
																		  																																				coupling agent  
																																			  
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																																Corresponding Author(s):
																Heng Fang,Yanying Wei   
																													     		
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																																														Online First Date: 03 November 2022   
																																														Issue Date: 13 December 2022
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