多壁奈米碳管/導電型碳黑應用於複合型導電高分子之電性研究

Abstract

填充型導電高分子本身並不導電，藉由加入導電的添加物填充於高分子中，使其具導電性。本論文利用高剪切力方式分別將碳黑(Carbon black,CB)與奈米碳管(Carbon nanotube,CNT)掺入聚二甲基矽氧烷(Polydimethyl siloxane,PDMS)中，並藉由添加不同比例的CNT、CB以及高分子分散劑，探討其分散程度和導電性的關係。 高分子分散劑，具有一錨接基(Anchoring group)與一樹脂相容鏈(Binder compatible chain)，可應用於奈米粒子的界面改質。改質過的奈米粒子能均勻的分散於高分子中，進而提升高分子導電性。 實驗證明CNT的最佳添加量為3wt%其導電性可以提升到10-1 S/cm；CB的最佳添加量為30wt%其導電性可提升到10-4 S/cm。高分子分散劑能提升導電高分子的導電性，並且使導電體穩定分散於高分子中，分散劑比例為導電體的30wt%時，更能使導電性再往上提昇，並且在經過8週後，仍能保持其分散特性。

The polymer of extrinsically conducting polymer (ECP) can not conduct electricity, so it needs to add electricity conducting fillers to make it conduct electricity. In this study, Carbon black-Polydimethyl siloxane (CB-PDMS) and Carbon nanotube-Polydimethyl siloxane (CNT-PDMS) can be fabricated to become nano composites by high shear force mixing synthesis. Furthermore, the relation between the degree of dispersion and electric conductivity by adding different proportion of CNT, CB and dispersant will also be discussed. Polymeric dispersants that comprise an anchoring group and a binder-compatible chain, can be used in the surface modification of nano-sized particles. After surface modification, the nano particle can disperse in polymer uniformly and promote the electric conductivity. Scientific evidence proves that the best proportion of CNT is 3wt%, and the electrical conductivity may promote to 10-1 S/cm; the best proportion of CB is 30wt%, and the electrical conductivity may promote to 10-4 S/cm. The dispersant reached 30wt% of conductor can not only promote the electrical conductivity of ECP, but also make the conductor disperse stably in polymer. When the proportion of dispersant reaches 30wt% of conductor, the electrical conductivity of conducting polymer with dispersant still maintains its dispersible characteristic after 8 weeks.