Structure‐property relationships in polymer blend nanocomposites
Structure‐property relationships in polymer blend nanocomposites
复制标题
聚合物共混纳米复合材料的结构-性能关系
DOI：
10.1002/pen.20103
复制
发表时间：
2004
影响因子：
3.2
通讯作者：
L. Goettler
中科院分区：
文献类型：
--
作者：
K. Lee;L. Goettler
采用直接熔融插层法，在热塑性硫化橡胶（TPV）和PP/EPDM共混物中制备了由有机改性剂处理的层状硅酸盐纳米片晶组成的纳米复合材料。纳米粘土和聚合物基体材料之间的极性力极大地影响纳米粘土的层间距和分散。力学性能强烈依赖于纳米复合材料的结构和形态，这可以通过增强体的相分配来修改。通过X射线衍射（XRD）和透射电子显微镜（TEM）的形态表征为理解这类材料中观察到的结构-性能关系提供了基础。随着有机粘土含量的增加，TPV/粘土纳米复合材料的拉伸模量在8wt%有机粘土含量时增加了170%，而拉伸强度随着有机粘土含量的增加而逐渐降低。在物理共混物体系中，拉伸模量对于所有PP/EPDM共混物组合物都增加，并且在具有连续PP基体的共混物中的选择性增强相的情况下通常显示出更高的值。这些共混物的拉伸强度在较高的纳米粘土含量下降低，无论如何进行共混。然而，当存在足够的选择性增强的EPDM相时，拉伸强度可以增加。
Nanocomposites comprising nanoscale platelets derived from layered silicates treated with an organic modifier in thermoplastic vulcanizates (TPV) and PP/EPDM blends were prepared by direct melt intercalation. The interlayer spacing and dispersion of the nanoclay are greatly affected by polar forces between the nanoclay and the polymeric matrix material. The mechanical properties strongly depend on the structure and morphology of the nanocomposites, which can be modified by phase partitioning of the reinforcements. Morphology characterization by X-ray diffraction (XRD) and transmission electron microscopy (TEM) provides the basis for understanding the observed structure-property relationships in this class of materials. With the increase of organoclay loading, the tensile modulus of TPV/clay nanocomposites increases by up to 170% at 8 wt% organoclay loading, while tensile strength gradually decreases with increase of organoclay loading. In the physical blend systems, the tensile modulus increases for all PP/EPDM blend compositions and generally shows higher values in the case of selectively reinforced phases in blends having a continuous PP matrix. The tensile strength of those blends decreases at higher nanoclay content no matter how blending is performed. However, the tensile strength may increase when sufficient selectively reinforced EPDM phase is present.