液体丁腈橡胶增韧丁腈橡胶/硫酸铜复合材料的制备及再加工性能  

Liquid Nitrile Rubber Modified NBR/CuSO_(4) Composites with Excellent Mechanical Properties and Cyclic Processing Ability

作　　者：李西飞 赵菊兰 邵卓妍 李秋影[1] Xifei Li;Julan Zhao;Zhuoyan Shao;Qiuying Li(School of Material Science and Engineering,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学材料科学与工程学院,上海200237

出　　处：《高分子材料科学与工程》2024年第3期48-55,共8页Polymer Materials Science & Engineering

基　　金：国家自然科学基金面上项目资助(51973059)。

摘　　要：在笔者课题组之前的工作中,成功地制备和分析了无水硫酸铜(CuSO_(4))填充丁腈橡胶(NBR)复合材料(NBR/CuSO_(4)),结果表明,CuSO_(4)的加入有效地提高了橡胶的强度,但同时也牺牲了断裂伸长率和可回收性,其实际应用受到了限制。文中使用低分子量的液体丁腈橡胶(LNBR)增韧NBR/CuSO_(4),并制备了具有高力学性能和优异可回收性的NBR/CuSO_(4)/LNBR复合材料。X射线衍射、硫化曲线、差示扫描量热分析结果表明,LNBR对CuSO_(4)与NBR的配位反应具有抑制作用;扫描电镜结果表明,LNBR降低了NBR/CuSO_(4)的交联密度。当LNBR的含量为4 phr时,断裂伸长率为583.0%、拉伸强度高达34.2 MPa、断裂能为71.58 MJ/m^(3)。此外,LNBR的加入促进了Cu-腈基(—CN)配位键的断裂和重建,从而提高了NBR/CuSO_(4)/LNBR复合材料的回收能力,其中的一种复合材料经二次加工后的回收率保持在93.6%。Incorporation of CuSO_(4)effectively enhanced the strength of rubber,but simultaneously accompanied by sacrifices of fracture elongation and recyclability,which is a challenge for their further applications.In our previous study,the preparation and analysis of nitrile butadiene rubber(NBR)composites filled with CuSO_(4)have been done.Here,low molecular weight liquid nitrile butadiene rubber(LNBR)was used to toughen NBR/CuSO_(4)and to prepare NBR/CuSO_(4)/LNBR composites with high mechanical properties and excellent recyclability.XRD,vulcanization curves,and DSC results indicate that LNBR has an inhibitory effect on the coordination reaction between CuSO_(4)and NBR.SEM results show that LNBR reduces the crosslinking density of NBR/CuSO_(4).The tensile strength up to 34.2 MPa and breaking energy of 71.58 MJ/m^(3) at a fracture elongation of 583.0%are obtained when the content of LNBR is 4 phr.Moreover,the addition of LNBR promotes the fracture and recombination process of Cu-CN coordination bonds,resulting in the increasing of the recovery capacity of NBR/CuSO_(4)/LNBR composites.Specially,the recovery capacity of one composite after secondary processing is kept at 93.6%.

关 键 词：丁腈橡胶 液体丁腈橡胶 配位交联 拉伸强度 循环加工 

分 类 号：TB332[一般工业技术—材料科学与工程]