SiO2／ZnO复合微粒对聚乳酸力学性能和结晶度的影响.pdf

第40卷第期
塑料工业
2012年1月
CHINA PLASTICS INDUSTRY
SiO2/ZnO复合徽粒对聚乳酸力学性能和结晶度的影响
潘峤,姚正军,周畅,周金堂
(南京航空航天大学材料科学与技术学院,江苏南京21110
摘要:选用纳米SiO2和微米Zn0作为粒子添加剂,用球臍法制备成复合粒子与聚乳酸粉末共混,通过挤出造粒
注戦成型制得试样。通过红外光谱分析、力学性能测试、断口SEM分析以及DSC测试探索了复合粒子与基体的相容
性、分散程度以及试样的力学性能和结晶度变化趋勢,并对结果进行了理论分析,确定了最佳配方是粒子质量分数为
0.5%的SiO2/Zn0球磨复合粒了/PLA组分,此时复合材料的结晶度达到41.45%,玻璃化温度为65.22℃,冲击强度
为4.92kJI/m2,与纯PIA比较分別提高了23.4%、8.8%和5.4%;拉伸强度、弯曲强度与纯PLA相比有轻徽降低
分别为68.82MPa和59.67MPa。
关键词:聚乳酸;纳米氧化硅;微米氧化锌;球磨;力学性能;结晶度
中图分类号:TQ321.2文献标识码:A
文章编号:1005-5770(2012)01-0027-05
Effect of Sio /Zno on the Mechanical Properties and Crystallinity of PLA
PAN Qiao, YAO Zheng-jun, ZHOU Chang, ZHOU Jin-tang
School of Materials Science and Technology, Nanjing university of Aeronautics and Astronautics
Nanjing21110, China〉
Abstract The Si0,/Zno powder which was made by ball milling methods was selected to mix with PLA
powder, and the samples of composites were made through extruding and injection molding. The effect of ball
milling treatment was detected by the FTIR and the variation tendency of mechanical properties was studied
by the mechanical properties test and the SEM analysis the DSC test results showed the variation tendency of
glass transition temperature and the degree of crystallinity of the composite. The best formulation, which had
been found through the integrated analysis, was adding O 5% Si0/Zno powder into PLA. At this point
the glass transition temperature, the degree of crystallinity and the impact strength of the composite became to
65.22 C, 4145%and 4.92 k/m which were respectively increased by 8.8, 23.4%and 5.4%. And
the tensile strength and the flexural strength of which were respectively become to 68.82 Mpa, 59.67 Mpa
hich were decreased appreciably than that of PLA
Keywords: PA Nano-si02 Micro-zno; Ball Milling Method; Mechanical Properties; Crystallinity
聚乳酸(PLA)是一种典型的具有生物降解功能
选用纳米粒子作为添加剂与塑料共混需要重点解
的塑料,较差的结晶性能和冲击初性大大限制了PLA决纳米粒子的团聚问题。将一种纳米粒子包覆在一种
及其复合材料的应用范围,并成为了限制其产品进一微米粒子表面制成纳米/微米复合粒子,可以提高粒
步打开市场的桎梏"21。添加纳米粒子制备成复合子在塑料基体中的分散性,能有效绶和单独添加纳米
材料能够有效克服纯PLA性能上的劣势,是一种行粒子出现的团聚现象,从而使纳米粒子的优异特性得
之有效的改良方法。当纳米粒子与塑料基体的相容性到充分发挥1。目前已有部分研究者采用不同的方
良好并且能在塑料基体中均匀分散时,纳米粒子能起法制备了纳米/微米复合粒子,如溶胶一凝胶法
到提高复合材料的力学性能的作用;另外纳米粒子在
机械研磨法?、气相法、千式冲击法等,其中机
塑料基体中能起到成核剂的作用,使复合材料的结晶械研磨法操作简便且易于实现,制成的纳米/做米复
性能得到改善。
合粒子能较好地克服团聚现象。本课题研究选用纳米
来南京航空航天大学基本科研业务费专项科研项目资助
作者简介:潘峤,男,1988年生,硕研究生,主要研究领域为高分子复合材料,材料加工成型等方向。
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