RHDPE/RHES复合材料的组织结构及增韧机理研究  

Study on the microstructure and toughening mechanism of RHDPE/RHES composite materials

作　　者：刘永超[1,2] 孙长红 王姝涵 任晓逆 白玲 白娟[3] 张磊 Liu Yongchao;Sun Changhong;Wang Shuhan;Ren Xiaoni;Bai Ling;Bai Juan;Zhang Lei(School of New Materials Engineering,Zhengzhou Vocational and Technical College,Zhengzhou 450010;Henan Diamond Material Intelligent Manufacturing Engineering Technology Research Center,Zhengzhou 450010;School of Materials Engineering,Zhengzhou University,Zhengzhou 450010;School of Materials Science and Engineering,Beijing University of Chemical Technology,Beijing 100029)

机构地区：[1]郑州职业技术学院新材料工程学院,郑州450010 [2]河南省金刚石材料智能制造工程技术研究中心,郑州450010 [3]郑州大学材料工程学院,郑州450010 [4]北京化工大学材料科学与工程学院,北京100029

出　　处：《化工新型材料》2024年第S02期248-253,共6页New Chemical Materials

基　　金：国家自然科学基金(22175013)。

摘　　要：以回收高密度聚乙烯(RHDPE)为基体、自制的复合改性剂HES为增韧剂,采用熔融共混的方式制备了RHDPE/RHES复合材料(简称RPES),研究了RPES的结晶形态、力学性能及熔体流动性,并探究了其增韧机理。结果表明:HES中RHDPE为连续相,橡胶为分散相,体系整体呈现“海岛”结构,分散相呈现“胞状”结构;随着橡胶含量的增加,RPES结晶越来越细化,晶粒尺寸逐渐减小;冲击强度逐渐增大,拉伸屈服强度和弯曲弹性模量有所下降,RPES熔体流动速率(MFR)逐渐减小。当橡胶含量为8%时,RPES的冲击强度达到45.24kJ/m^(2),是纯RHDPE的9.75倍,拉伸屈服强度和弯曲弹性模量保持率分别为83.24%和64.78%。RHDPE/橡胶试样缺口冲击断裂主要由银纹-空化损伤机理引起的,而PRES试样缺口冲击断裂主要是由银纹-剪切带屈服形变损伤机理引起的。RHDPE/RHES composite materials(referred to as RPES)were prepared by melt blending using recycled high-density polyethylene(RHDPE)as the matrix and self-made composite modifiers(HES)as toughening agents.The crystalline morphology,mechanical properties and melt flowability of RPES were studied and its toughening mechanism was investigated.The results showed that RHDPE was a continuous phase and rubber was a dispersed phase in RPES,presenting an overall‘island’structure and a‘cellular’structure in the dispersed phase.As the rubber content increased,the crystallization of RPE became finer,the grain size gradually decreased,the impact strength gradually increased,the tensile yield strength and bending elastic modulus decreased,and the flow rate of RPES melt gradually decreased.When the rubber content was 8%,the impact strength of RPES reached 45.24kJ/m^(2),which was 9.75 times that of pure RHDPE,and the tensile yield strength and flexural elastic modulus retention rates were 83.24%and 64.78%,respectively.The impact fracture of RHDPE/rubber specimens was mainly caused by the mechanism of silver streaks cavitation damage,while the impact fracture of PRES specimens was mainly caused by the mechanism of silver streaks shear band yield deformation damage.

关 键 词：复合改性剂 回收高密度聚乙烯 结晶形态 力学性能 增韧机理 

分 类 号：TQ334.2[化学工程—橡胶工业]