摘要
详细探究了聚乳酸(PLA)/聚乙二醇(PEG)共混体系在微型注塑加工条件下,不同的加工参数和柔性分子PEG对聚乳酸结晶行为和力学性能的影响。通过理论模拟数据表明微型注塑加工条件下具有较短的填充时间(0.6 s),较高的冷却速率和较大的温度梯度。热台偏光显微镜(POM)和差示扫描量热(DSC)分析的数据表明,PEG引入PLA体系能够促进PLA分子链的运动,成核点的形成,结晶速率的增加以及结晶度的提高。相对于迷你注塑成型,微型注塑加工的应用和模具温度的降低(110~80℃)能够显著增加制品内部分子链的取向程度;并且与PEG的相互协同作用,能够显著提高微型PLA/PEG制品的拉伸强度(53.3 MPa)和断裂伸长率(36.4%),起到增强增韧的作用。
The effects of polyethylene glycol( PEG) and processing parameters on the crystallization performance,morphological changes and mechanical property of polylactic acid( PLA)/PEG blends were studied.Theoretical simulation shows that the microinjection molding process has extreme filling time,higher cooling rate and larger temperature gradient.The results of hot stage polarized optical microscopy( POM) and differential scanning calorimetry( DSC) show that introducing the PEG into PLA blends can increase the intensity of nucleation and crystallization ability.Compared with mini-injection molding,applying the higher shear stress and decreasing the mold temperatures( 110 ℃ to 80 ℃) can increase the degree of orientation.The synergistic effect of higher shear stress and introducing the PEG can improve the tensile strength( 53.3 MPa) and elongation at break( 36.4%).
作者
赵中国
贾仕奎
张鑫
曹乐
张奇锋
杨其
ZHAO Zhong-guo;JIA Shi-kui;ZHANG Xin;CAO Le;ZHANG Qi-feng;YANG Qi(School of Materials Science and Engineering,Shaanxi University of Technology,Hanzhong 723001,China;State Key Laboratory of Polymer Materials Engineering of China,College of Polymer Science and Engineering,Sichuan University,Chengdu 610065,China)
出处
《塑料工业》
CAS
CSCD
北大核心
2019年第12期132-137,共6页
China Plastics Industry
关键词
微型注塑
聚乳酸
聚乙二醇
结晶行为
Microinjection Molding
Polylactic Acid
Polyethylene Glycol
Crystallization Behaviors
