摘要
聚丙烯自增强复合材料(All-PP)的增强体和基体为同一种聚合物聚丙烯,其力学性能对温度极为敏感,研究其力学性能的温度效应对该材料的使用和热冲压成型具有重要的指导意义。本文采用差示扫描量热仪(DSC)表征了All-PP材料的热性能,测试了–40~120℃范围内All-PP材料力学性能,并利用扫描电子显微镜(SEM)表征了不同温度条件下材料破坏界面,对其温度效应进行了综合分析。结果表明,All-PP的玻璃化转变温度(T_(g))为–11.5℃,拉伸强度随着温度的上升呈现出先增后减的趋势,在–20℃时达最大值118.5 MPa,低于该温度时发生界面脱黏,导致拉伸强度下降;断裂伸长率随温度的上升而增大;玻璃态时弹性模量始终维持在4.86 GPa左右,几乎不受温度影响,温度提升至–10℃时弹性模量开始随着温度上升而减小;弯曲模量随温度的升高而降低,在–10℃时降幅突增;层间剪切强度在20~120℃温度范围内呈线性下降,但在低温环境(–40~0℃)下受温度影响不大;微观形貌显示随着温度的上升,剪切破坏模式由界面脱黏转变为以基体破坏为主。
The reinforcement and matrix of polypropylene self-reinforced composites(All-PP)are the same polymer polypropylene,and its mechanical properties are extremely sensitive to temperature.Studying the temperature effect of its mechanical properties has important guiding significance for the use of this material and hot stamping.In this paper,the thermal properties of the All-PP were characterized by differential scanning calorimetry(DSC),and the mechanical properties of All-PP were tested in the range of–40–120℃,the material failure interface was characterized by scanning electron microscope(SEM)under different temperature conditions,and the temperature effect was comprehensively analyzed.The results show that the Tg of All-PP is–11.5℃,and the tensile strength shows a trend of first increase and then decrease with the increase of temperature,the maximum tensile strength reaches 118.5 MPa at–20℃,the interface debonding occurs below this temperature,leading to the decrease of tensile strength;The elongation at break increases with the increase of temperature;The elastic modulus in the glass state is always remains at about 4.86 GPa,which is hardly affected by temperature,when the temperature rises to–10℃,the elastic modulus begins to decrease with the increase of temperature;The flexural modulus decreases with the increase of temperature,and decrease sharply at–10℃;The interlaminar shear strength decreases linearly in the temperature range of 20–120℃,but is not greatly affected by temperature in the low temperature environment(–40–0℃);The microstructure shows that the shear failure mode changes from interface debonding to matrix failure with the increase of temperature.
作者
王安威
潘利剑
刘佳
张舒
吴佳木
岳广全
戎笑远
WANG Anwei;PAN Lijian;LIU Jia;ZHANG Shu;WU Jiamu;YUE Guangquan;RONG Xiaoyuan(College of Textiles,Donghua University,Shanghai 201620,China;Collaborative Innovation Center for Civil Aviation Composites,Donghua University,Shanghai 201620,China;COMAC Shanghai Aircraft Manufacturing Co.,Ltd.,Shanghai 201324,China;Suzhou Tianyi Composite Materials Co.,Ltd.,Suzhou 215513,China)
出处
《航空制造技术》
CSCD
北大核心
2023年第22期99-105,共7页
Aeronautical Manufacturing Technology
基金
上海市科学技术委员会2020年度“科技创新行动计划”(20511106902)。
关键词
聚丙烯
自增强复合材料
力学性能
温度效应
Polypropylene
Self-reinforced composites
Mechanical properties
Temperature effect
