外消旋聚乳酸/纳米碳酸钙复合材料的熔体流动性能  

Melt flow properties of PDLLA/nano-CaCO_3 composites

作　　者：梁基照[1] 周林[1] 何柳[1] 

机构地区：[1]华南理工大学机械与汽车工程学院,广东广州510640

出　　处：《合成树脂及塑料》2011年第3期66-68,77,共4页China Synthetic Resin and Plastics

摘　　要：采用双螺杆挤出机挤出造粒得到外消旋聚乳酸(PDLLA)/纳米碳酸钙(nano-CaCO_3)复合材料。复合材料的熔体体积流动速率(MVR)随着温度、载荷的增加而升高,但随着w(nano-CaCO_3)的增加而降低;在相同载荷或温度下,PDLLA/nano-CaCO_3复合体系[w(nano-CaCO_3)为4%]的MVR较PDLLA树脂低;在相同w(nano-CaCO_3)下,载荷越大,复合材料的MVR越大。复合材料的熔体密度(ρ)随着温度的增加而降低,但随着载荷和w(nano-CaCO_3)的增加而升高:在相同的载荷或温度下,复合材料的ρ较PDLLA树脂高;在相同w(nano-CaCO_3)下,载荷越大,复合材料的ρ也越大。Poly（DL-lactic acid）/nano-calcium carbonate（PDLLA/nano-CaCO3） composites were prepared via extrusion by a twin-screw extruder and pelletization. The melt volume flow rate（MVR） of the composites increased with the rise in the temperature and load, but dropped with raising the mass fraction of nano- CaCO3. The composite containing 4% of nano-CaCO3 by mass had lower MVR than PDLLA at the identical loador temperature. In case the composites possessed the same content of nano-CaCO3, the heavier the load, the larger their MVR. The melt density（p） went down as the temperature rose and up as the load and filler content augmented. The composites had higher p than PDLLA at the identical loador temperature. In case the composites possessed the same content of nano-CaCO3, the heavier the load, the higher their p.

关 键 词：外消旋聚乳酸 纳米碳酸钙 复合材料 熔体体积流动速率 熔体密度 

分 类 号：TB332[一般工业技术—材料科学与工程]