ABSTRACT:An electroconductive composite ofpolyaniline and poly(p-phenylene terephthalamide) (PPTA) was prepared to provide a light-weight, self-supporting, conductive polymeric film. The electropolymerization of aniline was conducted in acidic water on the electrode covered with the PPTA film. The composite is a flexible self-supporting film having a tensile modulus of 2 GPa and tensile strength of 160 MPa. The results of cyclic voltammetry and battery test on the composite electrode revealed that the electrochemical activities of the composite are almost the same as those of the polyaniline single film.
KEY WORDSPoly(p-phenylene terephthalamide) Polyaniline Conductive Composite / Secondary Battery / Polyaniline is a promising conductive polymers because of its facility of synthesis and chemical stability. Its applications such as secondary battery 1 -3 and display4 have been investigated extensively. A film of polyaniline is electrochemically polymerized in acidic water,5 but the film is mechanically weak like other electroconductive polymers. In order to improve these mechanical properties, the composite formation has been attempted using elecyroconductive polymers and inert host polymers. Among them, the most successful method to form the composite was found in the electropolymerization of conductive polymer on the electrode covered with the insulating polymer. For example, polypyrrole/ poly(vinyl chloride) (PVC), 6 • 7 polypyrrole/ poly(vinyl alcohol), 8 polythiophene/PVC 9 etc. have been prepared by this method. As for the polyaniline, there are only a few reports on the composite such as polyaniline/ poly(methyl methacrylate). 10 This composite is a thin film of 200 nm thickness and not selfsupporting.Recently we reported the mechanically strong conductive composite of polypyrrole and poly(p-phenylene terephthalamide) (PP-T A) formed by the above method. 11 PPT A is well-known as the molecule used for Kevlar fiber of du Pont company having ultrahigh strength and ultrahigh modulus. The PPT A film was found by us to be prepared by the electrodposition of PPT A polyanion dissolved in dimethylsulfoxide (DMS0). 12 As-electrodeposited PPT A film is in a state of gel. The PPT A film obtained by the appropriate treatment is in a solvated state with DMSO and has coarse texture, which enables us to form the composite with conductive polymers.11 In this paper, we report the composite of polyaniline and PPTA prepared by the electropolymerization of aniline on the electrode covered with the electrodeposited PPT A film and also describe the performance 733
Strong requirements for automation in the production processes using machine tools have been increasing due to lack of high-skilled machining engineers. Automation used to be utilised in mass production, but it is also necessary in medium- to low-volume production recently. Next requirements will be monitoring or sensing functions to make the following possible: prompt service when the machine stops; detection of abnormality before the machine breaks down; and compensation of thermal displacement to ensure machining accuracy. These now need to be performed automatically in place of operators so that abnormality can be detected during machining operation. In this paper core technologies to support automation system will be discussed which are operation monitoring, predictive maintenance, sensing interface and thermal displacement compensation as
a sensing application.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.