( 中南大學(xué) 材料科學(xué)與工程學(xué)院, 長沙 410083)
摘 要: 研究了在砂紙打磨、 硅烷偶聯(lián)劑處理鋁板表面兩種條件下，馬來酸酐接枝聚丙烯(MPP)含量對鋁薄板/聚丙烯界面粘接剪切強度的影響。 聚丙烯中不含MPP時， 粘接剪切強度分別為3.44和4.57 MPa；添加MPP后， MPP的酸酐基團(tuán)及其水解形成的羧基與鋁板表面羥基、 Al3+發(fā)生界面化學(xué)反應(yīng)， 粘接強度得以大幅提高。 MPP含量為20%時， 粘接強度分別達(dá)到最大值10.30和10.64 MPa。 MPP含量繼續(xù)增大時， 在鋁板表面形成較低分子量MPP的聚集區(qū)， 且該區(qū)與MPP貧乏區(qū)之間的分子鏈纏結(jié)作用弱， 導(dǎo)致鋁板/聚丙烯的界面粘接強度隨MPP含量增加而下降。
關(guān)鍵字: 鋁薄板; 聚丙烯; 馬來酸酐接枝聚丙烯; 界面; 粘接強度
shear strength of adhesion bonded aluminum sheet/polypropylene/aluminum sheet
（ School of Materials Science and Engineering,
Central South University, Changsha 410083, China）
Abstract: The effect of amount of maleic anhydride grafted polypropylene(MPP) in copolymer of polypropylene(PP) and MPP on shear strength of adhesion bonded aluminum sheet/polypropylene/aluminum sheet was investigated under surface pretreatments of Al sheet by sand grinding, γ-aminopropyltriethoxy silane solution after sand grinding respectively. For pure PP, the adhesion strength is between 3.44-4.57 MPa. It shows obvious promotion of the adhesion strength with 5%-30% amount of MPP in the copolymer due to the interface interaction between —OH，Al3+ at surface of the Al sheet and —COOH, carboxyl groups on MPP. The maximum values of the adhesion strength, 10.3 MPa and 10.64 MPa for the two surface treatments respectively, are obtained with 20% MPP. With increase of MPP content, the adhesion strength decreases due to the formation of a weak layer of higher content of MPP with low molecules, and low connectivity strength between the layer of higher content of MPP and the layer of high content of PP.
Key words: aluminum sheet; polypropylene; maleic anhydride grafted polypropylene; interface; adhesion strength
