基于多熔体多次注射成型的弹性湍流构筑界面互锁结构  

Construction of interfacial interlocking structure through elastic turbulence in multi⁃melt multi⁃injection molding(M3IM)

作　　者：肖元昊 初立秋[2] 陈历波 张师军[2] 赵鑫 张浩[2] 吕芸[2] 刘磊[1] 张凯[1] 杨鸣波[1] XIAO Yuanhao;CHU Liqiu;CHEN Libo;ZHANG Shijun;ZHAO Xin;ZHANG Hao;LYU Yun;LIU Lei;ZHANG Kai;YANG Mingbo(College of Polymer Science and Engineering,State Key Laboratory of Polymer Materials Engineering,Sichuan University,Chengdu 610065,China;SINOPEC(Beijing)Research Institute of Chemical Industry Co,Ltd,Beijing 100013,China)

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,成都610065 [2]中石化(北京)化工研究院有限公司,北京100013

出　　处：《中国塑料》2024年第12期81-89,共9页China Plastics

基　　金：国家自然科学基金面上项目(21674069)。

摘　　要：利用多熔体多次注射成型(M^(3)IM)对不相容体系聚偏氟乙烯(PVDF)和高密度聚乙烯(PE-HD)进行了多层次结构的制备及界面性能的研究。结果发现,两种不相容聚合物材料在M^(3)IM的特殊加工外场作用下形成了一种独特的界面互锁结构,使得界面剥离强度提升3.3倍。通过实验与数值模拟分析表明,这种界面互锁结构的形成是由于二次熔体注入一次熔体时在突破段产生的不稳定流动,以及聚合物熔体在低雷诺数下的弹性湍流所导致;厚度方向上的雷诺数呈双峰分布,且熔体界面处的增加可达1个数量级以上,突破后段相较于突破前段,熔体的湍流动能及动能耗散率显著增加。In this study,multi-melt multi injection molding(M3IM)was employed to construct a hierarchical structure for an incompatible system of poly(vinylidene difluoride)(PVDF)and high-density polyethylene(PE-LD),and their inter-facial properties were investigated.The results indicated that a unique interfacial interlocking structure was formed in these two incompatible polymers under the special external field of M3IM process,resulting in an increase in the peeling strength by 3.3 times.The experimental and numerical simulation analyses demonstrated that the formation of such an interfacial interlocking structure was attributed to an unstable flow generated at the breakthrough region when the second-ary melt was injected into the primary melt as well as the elastic turbulence of the polymer melt at low Reynolds num-bers.The Reynolds numbers in the thickness direction presented a bimodal distribution and tended to increase by more than one order of magnitude at the interface region.Compared to the regions before the breakthrough part,the turbulent kinetic energy and kinetic energy dissipation rate of the melt increased significantly after the breakthrough part.

关 键 词：多熔体多次注射成型 界面互锁结构 弹性湍流 界面增强 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]