Modesti M, Besco S, Lorenzetti A, Zanirato G, Rauli F
Department of Chemical Process Engineering, University of Padova, 35131 Padova, Italy.
J Nanosci Nanotechnol. 2005 Jun;5(6):958-63. doi: 10.1166/jnn.2005.127.
This study focuses on the understanding of the reinforcing effect given by organo-modified layered silicates to a high-density polyethylene and the influence on the crystallization properties of this polymer. The addition of organo-modified clay to high-density polyethylene resulted in an evident increase in the tensile and flexural Young's modulus of the material with respect to unfilled polymer. The morphology, crystallinity, and thermo-oxidative stability of such nanocomposites were investigated using X-ray diffraction, transmission electron microscopy, differential scanning calorimetry, and oxidation induction time test. The materials obtained show tactoid as well as intercalated and exfoliated structures with different dominant states depending on the loading level and process conditions. It was observed that organic ions not only change mixing behavior but also influence material properties, including the degree of crystallinity and the stability to the thermo-oxidative phenomena.
本研究着重于理解有机改性层状硅酸盐对高密度聚乙烯的增强作用以及对该聚合物结晶性能的影响。向高密度聚乙烯中添加有机改性黏土，相对于未填充的聚合物，材料的拉伸和弯曲杨氏模量显著增加。使用X射线衍射、透射电子显微镜、差示扫描量热法和氧化诱导时间测试等手段研究了此类纳米复合材料的形态、结晶度和热氧化稳定性。所得到的材料呈现出片晶状以及插层和剥离结构，其主导状态因负载水平和加工条件而异。研究发现，有机离子不仅改变混合行为，还会影响材料性能，包括结晶度和热氧化现象的稳定性。
