PLA/HNTs纳米复合材料的制备、性能及其发泡行为  

Preparation and Properties of PLA/HNT s Nanocomposites and Its Foaming

作　　者：梁丽金[1] 钟旭飘 谢德明[1] 

机构地区：[1]暨南大学生物医学工程系,广东广州510632

出　　处：《材料科学与工程学报》2015年第5期743-747,758,共6页Journal of Materials Science and Engineering

摘　　要：采用熔融共混炼法制备交联改性聚乳酸(PLA)/埃洛石(HNTs)纳米复合材料,利用热重分析、差示扫描量热分析、偏光显微镜和流变仪对其热学性能、结晶、流变行为进行了研究,并采用超临界CO2流体技术进行微孔发泡,利用扫描电镜对泡孔形态进行了表征。结果表明:随着HNTs含量的增加,PLA/HNTs复合体系在高温下的热稳定性下降,结晶度由37.4%下降为28.0%,但异相成核效果明显,结晶速率提高,结晶时间由2h缩短为10min。同时,加入HNTs后,PLA/HNTs的熔体粘度显著增加,但随着HNTs含量的增多,PLA/HNTs纳米复合材料粘度增加的趋势逐渐趋缓。当HNTs含量为0.5wt%时,体系粘度达到最大值且发泡效果最佳,泡孔平均直径为21.23μm,泡孔密度达到1.08×109个/cm3。Polylactide（PLA）/halloysite（HNTs）nanocomposites were prepared by melt-blending.Thermal performance,crystallization and rheological behavior were investigated respectively by thermal gravimetric analysis,differential scanning calorimetry,polarized optical microscopy and rheometer.PLA/HNTs nanocomposites microcellular foam was also obtained by supercritical CO2 fluid foaming technology,and the cell morphology was studied with scanning electron microscopy.Experimental results indicate that the thermal degradation temperature and the crystallinity of the PLA/HNTs nanocomposites decrease with the increase of HNTs contents in composites,and the crystallinity declines from 37.37% to 28.01%.However,the heterogeneous nucleation effects of the complex are obvious and the crystallization rates accelerate with the addition of HNTs,and the crystallization time of each PLA/HNTs sample reduces from 2hof PLA3001Dto10 min of PLA/HNTs.With the HNTs blending,the viscosity of PLA/HNTs increases significantly,but the increment gradually decrease with the HNTs content increasing.For the 0.5wt% PLA/HNTs sample,the viscosity reaches the maximum and the best foaming plastic is obtained with an average cell diameter of21.23μm and cell density of 1.08×10^9/cm3.

关 键 词：聚乳酸 埃洛石 纳米复合材料 结晶 流变行为 发泡 

分 类 号：TB332[一般工业技术—材料科学与工程]