摘要
为研究分散相不同形态结构对共混物的力学及摩擦学行为的影响,以PBT/HDPE共混体系为研究对象,通过挤出过程的拉伸牵引作用制备分散相为纤维结构的共混物;通过控制注射成型温度,调控PBT分散相的不同形态结构,研究其对摩擦学性能的影响及其抗磨损机制;通过在分散相中加入润滑粒子多壁碳纳米管(MWCNTs),探讨MWCNTs的分散形态对共混物摩擦磨损性能的影响。结果表明:注塑温度为200℃时,PBT分散相主要呈纤维状,MWCNTs主要分布在PBT中;注塑温度为240℃时,PBT呈球状分散在HDPE中,部分MWCNTs迁移至相界面,部分埋入HDPE基体。拉伸试验结果表明:分散相为纤维状的PBT/HDPE共混物比分散相为球状时的拉伸强度高,MWCNTs的加入显著提升了共混物的断裂拉伸率。摩擦磨损试验结果表明:MWCNTs/PBT/HDPE共混物的摩擦磨损性能与PBT形态结构紧密相关,且受摩擦磨损条件影响;低载荷低转速下MWCNTs的存在恶化了球状分散相共混物的摩擦磨损性能,只有高载荷或高转速下MWCNTs脱离PBT后,MWCNTs才能发挥其润滑减磨作用。
In order to study the effect of dispersed phase morphology on the mechanical and tribological properties of blends, PBT/HDPE blends were used as the research object, and the blends with fiber structure as dispersed phase were prepared by tensile traction during extrusion.By controlling the injection molding temperature and adjusting the different morphology of PBT dispersed phase, the effect of PBT morphology on tribological properties and wear resistance mechanism were studied.By adding lubricating particles multi-walled carbon nanotubes(MWCNTs)into the dispersed phase, the effect of the dispersion morphology of MWCNTs on the friction and wear properties of the blends was discussed.The results show that when the injection temperature is 200 ℃,the dispersed phase of PBT is mainly fibrous, and the added MWCNTs are mainly dispersed in the PBT phase.When the injection temperature is 240 ℃,the PBT is spherical dispersed in HDPE matrix, and some MWCNTs are migrated to the phase interface and some are embedded in HDPE matrix.The tensile result show that the tensile strength of PBT/HDPE blends with fibrous dispersed phase is higher than that with spherical dispersed phase, and the elongation at break of the blends is significantly increased after the addition of MWCNTs.The tribological properties of MWCNTs/PBT/HDPE blends are closely dependent on the dispersed phase morphology and the wear condition.At low contact load and low sliding speed, the friction and wear performance of blends with spherical phase morphology is deteriorated by the addition of MWCNTs.MWCNTs can’t play the role of lubrication and wear reduction until they are released from PBT at high contact load or high sliding speed.
作者
肖化星
余小峰
陆媛
龙春光
XIAO Huaxing;YU Xiaofeng;LU Yuan;LONG Chunguang(College of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha Hunan 410114,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第4期102-109,共8页
Lubrication Engineering
基金
国家自然科学基金项目(51503021)。
关键词
碳纳米管
摩擦磨损
分散相
聚合物
高密度聚乙烯
carbon nanotubes
friction and wear
dispersed phase
polymer
high density polyethylene
