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为提高线性低密度聚乙烯(LLDPE)的拉伸强度和模量,扩大其应用领域,将多壁碳纳米管(MWCNTs)与LLDPE共混,通过熔体挤出-拉伸法制备了LLDPE/MWCNTs复合薄膜.利用扫描电子显微镜(SEM)、X-射线衍射仪(XRD)、拉曼光谱分析和拉伸测试对LLDPE/MWCNTs复合薄膜的结晶行为及力学性能进行表征.结果表明:MWCNTs在基体中分散均匀,形成取向的纳米杂化串晶结构;MWCNTs和LLDPE基体间界面结合力较强;MWCNTs的异相成核作用促进了聚合物分子链的结晶,使结晶度增加;MWCNTs的加入显著改善了复合薄膜的拉伸强度和模量,当MWCNTs的含量为1%时,拉伸强度和模量分别提高了101.8%和117.6%,同时,韧性也提高到原来的2.5倍.
In order to increase the tensile strength and modulus of linear low density polyethylene (LLDPE) and expand its applications, multi-walled carbon nanotubes (MWCNTs) were blended with LLDPE to prepare LLDPE / MWCNTs composite films were prepared.The crystallization behavior and mechanical properties of LLDPE / MWCNTs composite films were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and tensile test.The results show that MWCNTs in the matrix , The nanocomposites have been dispersed uniformly and formed. The interfacial bonding between MWCNTs and LLDPE was stronger. The heterogeneous nucleation of MWCNTs promoted the crystallization of polymer chains and increased the crystallinity. The addition of MWCNTs was significant When the content of MWCNTs is 1%, the tensile strength and modulus increase by 101.8% and 117.6%, respectively, while the toughness also increased to 2.5 times that of the composite film.