退火对LLDPE/MWCNTs超薄制品的增强增韧作用  

Toughening and Reinforcing Effect of Annealing on Ultra-thin LLDPE/MWCNTs Parts

作　　者：石素宇 杨秀琴 赵康[2] 冯孟非 燕世林 Shi Suyu;Yang Xiuqin;Zhao Kang;Feng Mengfei;Yan Shilin(School of Materials and Chemical Engineering,Henan Institute of Engineering,Zhengzhou,Henan,450007;School of Material Science and Engineering,Zhengzhou University,Zhengzhou,Henan,450001)

机构地区：[1]河南工程学院材料与化学工程学院,河南郑州450007 [2]郑州大学材料科学与工程学院,河南郑州450001

出　　处：《现代塑料加工应用》2018年第3期13-16,共4页Modern Plastics Processing and Applications

基　　金：国家自然科学基金(51173171);河南工程学院博士基金项目(D2015018)

摘　　要：通过微注射成型技术制备了线性低密度聚乙烯/多壁碳纳米管(LLDPE/MWCNTs)超薄制品,分别在55,70,85,100℃下退火3h。通过拉伸测试、差示扫描量热分析和X-射线衍射表征考察了退火对LLDPE/MWCNTs制品结构及力学性能的影响。结果表明:退火显著提高了LLDPE/MWCNTs超薄制品的拉伸强度和断裂韧性。退火诱导新晶体的形成,促进初级晶体的完善,提高制品的结晶度。基于微结构的变化,讨论了退火后LLDPE/MWCNTs超薄制品的增强增韧机理。Ultra-thin LLDPE/MWCNTs parts were prepared by micro-injection molding and then annealed at four different temperatures(55,70,85,100℃)for 3 h,respectively.Effect of annealing on the structure and mechanical properties of LLDPE/MWCNTs parts has been investigated by tensile test,differential scanning calorimetry(DSC)and X-ray differaction(XRD).It is indicated that the tensile strength and toughness have been enhanced significantly after annealing.Annealing induces development of new crystals and promotes perfection of primary lamellae,leading to increased crystallinity.Based on analysis of microstructure variations,the mechanism of considerably improved strength and toughness induced by annealing is discussed.

关 键 词：退火 微注射成型 线性低密度聚乙烯 多壁碳纳米管 超薄制品 增强 增韧 

分 类 号：TB383.2[一般工业技术—材料科学与工程] TQ325.12[化学工程—合成树脂塑料工业]