电响应聚合物薄膜的表面图案化

研究了炭黑(CB)和石墨(GP)填充高密度聚乙烯(HDPE)复合体系的动态流变行为.发现高填料含量时出现似固体行为,并认为它归因于无机粒子网络逾渗结构的形成.在相同聚合物基体条件下,粒子种类和粒子几何参数(粒子形状、大小、粒径分布)对低频区域流变行为、流变参数的逾渗行为和逾渗阈值(φc)有决定性影响,且种类的影响相比于粒子几何参数更为显著.此外,高表面活性及高比表面积(大径厚比、小尺寸)粒子填充体系具有较低的φc.

Dynamic Rheological Behavior of Particles-filled HDPE Composite Systems

The dynamic rheological behavior of the high-density polyethylene(HDPE) filled with carbon black(CB), or graphite(GP), i.e. HDPE/CB and HDPE/GP composites, was studied. The pseudo-solidlike behavior appearing in high-loaded composites could be attributed to the formation of the filler percolated network structure. In the composites with the same matrix, the filler kind and the geometric parameters of filler(particle shape, particle size and particle size distribution) play an important role in the dynamic rheological properties at low frequencies, the percolation behavior of the rheological parameters and the percolation threshold(φc). Compared with the geometric parameters of the filler particles, the filler kind exerts a more striking influence on them. The composites filled with particles having a large surface activity and large specific surface area possess a lower value of φc.