论文部分内容阅读
通过熔融共混法制备了一系列聚乳酸(PLA)/矿物填料复合材料.采用示差扫描量热(DSC)研究了含有碳酸钙(CaCO3)、蒙脱土(MMT)和凹凸棒土(AT)的聚乳酸复合材料在不同热历程中的结晶和熔融行为.研究发现,MMT和AT对PLA的慢速降温结晶无明显影响,而碳酸钙在慢速降温过程中能够有效促进PLA结晶;在2.5 K/min的降温速率下,结晶热焓随碳酸钙含量增加而增加;填料种类和含量会对复合材料升温过程的冷结晶和熔融产生较大影响,低含量矿物填料主要对PLA的冷结晶起成核作用,其中MMT成核效果最好.较高含量下不同填料会对PLA晶体形态产生影响,从而得到多样的DSC曲线变化.
A series of polylactic acid (PLA) / mineral filler composites were prepared by melt blending method.Calcium carbonate (CaCO3), montmorillonite (MMT) and attapulgite (AT) were investigated by differential scanning calorimetry Of polylactic acid composites in different thermal history of the crystallization and melting behavior of the study found that MMT and AT PLA slow cooling crystallization has no significant effect on the slow cooling process of calcium carbonate can effectively promote the crystallization of PLA; Under the cooling rate of K / min, the enthalpy of crystallization increases with the increase of CaCO3 content. The type and content of filler have a great influence on the cold crystallization and melting of the composite. The low content of mineral filler mainly affects the cold crystallization of PLA Nucleation effect, of which MMT nucleation effect is the best.Under high content of different fillers will have an impact on the morphology of PLA crystals, resulting in a variety of DSC curve changes.