以聚乙烯醋酸乙烯酯(EVA)为树脂基体,氢氧化镁(MH)为无卤阻燃剂,并分别加入表面改性剂硬脂酸(SA)和十一烯酸(UA),通过紫外光辐照进行交联,通过凝胶含量测试、红外光谱、扫描电镜等测试研究了交联及2种不同的表面改性剂对EVA/MH性能的影响.研究结果表明,在含有UA的EVA/MH体系中交联后材料的拉伸强度达到10 MPa以上,断裂伸长率达到150％以上,同时氧指数达到43以上.通过微观研究表明这主要是由于含乙烯基的UA在交联过程中参与了交联反应形成了交联点,同时提高了氢氧化镁与树脂基体EVA的界面作用.
The influence of photocrosslinking and surface modification agent on the properties of halogen-free flame retardant polyolefin blends,which used polyethylene vinyl acetate (EVA) as matrix resin,magnesium hydroxide (MH) as halogen-free flame retardant,and stearic acid (SA) or undecylenic acid (UA) as surface modification agent,was investigated.The obtained results from gel content,FT-IR,LOI,and mechanical property tests show that the tensile strength is higher than 10 MPa,the elongation at break is higher than 150 ％,and the LOI value reaches 43.The TEM,SEM tests demonstrate that undecylenic acid (UA) can be photo-grafted to the polymer crosslink network and build covalent connection between MH and the EVA matrix during the photocrosslinking process,which result in better mechanical property and flame retardant property.
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