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《工程塑料应用》 2020年第09期
DOI:10.3969/j.issn.1001-3539.2020.09.019
加速老化对PLA/TiO2复合材料性能影响
贾仕奎,张向阳,赵中国,陈立贵,付蕾
陕西理工大学材料科学与工程学院,矿渣综合利用环保技术国家地方联合工程实验室,陕西汉中 723000 
Effects of Accelerated Aging on Properties of PLA/TiO2 Composites
Jia Shikui, Zhang Xiangyang, Zhao Zhongguo, Chen Ligui, Fu Lei
School of Materials Science and Engineering, National & Local Joint Engineering Laboratory for Slag Comprehensive Utilization and Environmental Technology, Shaanxi University of Technology, Hanzhong 723000, China 
摘要:利用双螺杆挤出机熔融共混制备不同纳米二氧化钛(nano-TiO2)含量的PLA/nano-TiO2复合材料,并在加速自然老化测试仪中进行老化试验,对老化前后的复合材料试样进行扫描电子显微镜、广角X射线衍射仪、差示扫描量热仪、偏光显微镜、万能试验机和悬臂梁冲击试验机等测试。结果表明,与未老化材料相比,连续老化7 d后的纯PLA的断面出现少量的大裂纹,而表面呈现出大量的微裂纹,PLA/nano-TiO2复合材料老化前后的断面形貌变化较小,老化7 d后的复合材料表面呈现出凝胶状或少量的大裂纹;老化7 d后的纯PLA的拉伸强度和结晶度分别提高了3.34%和6.4%,断裂伸长率与缺口冲击强度分别下降了11.25%和37.69%;添加质量分数1%的nano-TiO2时,复合材料老化7 d后的拉伸强度和结晶度分别提高了5.17%和17.89%,断裂伸长率与缺口冲击强度分别下降了34.96%和14.95%。 
Abstract:Poly(lactic-acid) (PLA)/nano-titanium dioxide (nano-TiO2) composites with different content of nano-TiO2 were prepared by melt-blending in twin-screw extruder, and their aging behaviors of pure PLA and its composites were performed via an accelerated nature environment aging tester. Scanning electron microscope, wide-angle X-ray diffractometer, differential scanning calorimeter, polarizing microscope, universal testing machine and cantilever impact testing machine were used to execute morphology, crystallization and mechanical properties of the composites before and after aging. The results show that, compared with the material without aging, the fracture surface of pure PLA after continual aging 7 d shows a small quantity of large cracks, while its surface gives a mass of microcracks, and the fracture surfaces of PLA/nano-TiO2 composites before and after aging have only slight change, while their surfaces after continual aging 7 d show gelatinous morphology or a small quantity of large cracks. The tensile strength and crystallinity of pure PLA after continual aging 7 d increase by 3.34% and 6.4%, and its elongation at break and notched impact strength decrease by 11.25% and 37.69%, respectively. The tensile strength and crystallinity PLA/nano-TiO2 composite with mass fraction of 1% nano-TiO2 after aging 7 h improve 5.17% and 17.89%, and its elongation at break and notched impact strength decrease by 34.96% and 14.95%, respectively. 
关键词:聚乳酸;纳米二氧化钛;加速自然老化;结晶性能;力学性能;形貌 
Keywords:poly (lactic-acid); nano-titanium dioxide; accelerated nature aging; crystallization property; mechanical property; morphology 
基金:国家自然科学基金项目(51703121),中国博士后科学基金特别资助项目(2018T111050) 
本文引用格式:
贾仕奎,张向阳,赵中国,等.加速老化对PLA/TiO2复合材料性能影响[J].工程塑料应用,2020,48(9):103-109,120.
Jia Shikui,Zhang Xiangyang,Zhao Zhongguo,et al. Effects of accelerated aging on properties of PLA/TiO2 composites[J]. Engineering Plastics Application,2020,48(9):103-109,120. 

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