摘要
将膨胀石墨(EG)/硬脂酸(SA)通过高温膨胀制得部分氧化的石墨烯(p-GO),并将p-GO与聚乙二醇(PEG)在超声振荡耦合真空灌注作用下制备出p-GO/PEG复配成核剂,利用双螺杆挤出机熔融共混制备一系列聚乳酸(PLA)/p-GO/PEG复合材料,并对其进行傅立叶变换红外光谱、广角X射线衍射、扫描电子显微镜、差示扫描量热、热失重分析、力学性能等测试。结果表明,高温膨胀法能够在很大程度上将EG充分剥离并部分氧化;p-GO对复合材料的结晶行为有着明显的促进作用,但含量过多易引起团聚现象;与纯PLA相比,当p-GO质量分数为0.6%时,PLA/p-GO复合材料的拉伸强度提高了4.9%,悬臂梁缺口冲击强度提高了48.4%,初始热分解温度提高了7.88℃;而相应的PLA/p-GO/PEG复合材料的拉伸强度提高了7.5%,悬臂梁缺口冲击强度提高了51.6%,初始热分解温度提高了9.4℃。
Partial graphene oxide (p-GO) was prepared by high temperature expansion of expanded graphite (EG)/stearic acid (SA),and p-GO/polyethylene glycol (PEG) mixture as a nucleating agent was prepared by ultrasonic vibrating coupled with vacuum impregnating. A series of polylactic acid (PLA)/p-GO/PEG composites were prepared by melt blending using a twinscrew extruder,and tested by using FTIR,WAXD,SEM,DSC,TG and universal testing machine. The results show that EG can be largely exfoliated and oxidized via the high temperature expansion method. p-GO has a significant effect on the crystallization behavior of the composite,but high content is easy to cause agglomeration. When the mass fraction of p-GO is 0.6%,compared with pure PLA,the tensile strength of PLA/p-GO composite is increased by 4.9%,the Izod notched impact strength is increased by 48.4%, and the initial thermal decomposition temperature is increased by 7.88℃. While the tensile strength of PLA/p-GO/PEG composite is increased by 7.5%,the Izod notched impact strength is increased by 51.6%,and the initial thermal decomposition temperature is increased by 9.4℃.
作者
曹乐
贾仕奎
张奇锋
王忠
陈立贵
付蕾
Cao Le;Jia Shikui;Zhang Qifeng;Wang Zhong;Chen Ligui;Fu Lei(School of Materials Science and Engineering, Shaanxi University of Technology, Hanzhong 723000, China)
出处
《工程塑料应用》
CAS
CSCD
北大核心
2019年第1期132-137,共6页
Engineering Plastics Application
基金
国家自然科学基金项目(51703121)
陕西省自然科学基础研究计划项目(2017JQ5071)
关键词
聚乳酸
聚乙二醇
膨胀石墨
结晶
力学性能
热性能
polylactic acid
polyethylene glycol
expanded graphite
crystallization
mechanical property
thermal property
