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Preparation and Study on the Electrical Conductive Polyurethane Foam

Author: WuShuQing
Tutor: DengJianRu
School: Hunan University
Course: Applied Chemistry
Keywords: Conductive material Polyurethane foam Polyether polyol Black
CLC: TQ328
Type: Master's thesis
Year: 2002
Downloads: 268
Quote: 1
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Abstract

In this thesis, polyether polyols as the substrate, ultra-fine high-structure carbon black as a conductive filler to three ethylene diamine and dibutyl tin compound catalyst, chelated titanate as coupling agent (interfacial modifier), the use of water-blown formulations were synthesized through free foam volume resistivity at 10 ~ 8 ~ 10 ~ 9Ω. cm conductivity type between the polyurethane foam. This material has both conductive polyurethane foam also has excellent characteristics, is an important research value and has broad application prospects of new functional materials. Carbon black, in addition throughout the reaction also acts as a conductive powder filler, emulsifiers, nucleating agents (bubble nucleating agents, crystal nucleating sentence), like foam stabilization effect powder. For these situations, the paper focuses on the formulation of the conductive sponge, carbon black and polyether polyols interface compatibility, carbon black dispersed in a mixed system, carbon black sponge mechanical and electrical properties as well as on foam behavior and the impact of micro-phase separation, on this basis, to establish a carbon black emulsion and foam stabilization model. This paper uses the table (circles) surface chemistry on the coupling effect of interfacial modification was studied using infrared spectroscopy (IR) and dynamic mechanical analysis (DMA) on the sponge micro-phase separation were studied, with mechanical experiments studied the mechanical properties of conductive sponge, a method of measuring the resistivity of the electrical properties of conductive sponge. The results showed that: the addition of carbon black substantially increased viscosity of the system, has seriously affected the foaming process and sponges workability. And the smaller the particle size of carbon black, the higher the structural, this effect is more significant. High structure carbon black sponge gives good conductivity at the same time, will lead to decline in mechanical properties. As a bubble nucleating agent, carbon black can damage the substrate and the gel foam sponge balance between reaction; as a crystal nucleating agent, it can affect the matrix of micro-phase separation and foam degree of separation, resulting in the sponge opening rate than low; addition, the uneven distribution of carbon black particles result in higher volume resistivity of the sponge. Studies show that: in a matrix with 2% (mass percentage of the polyether triol) super conductive carbon black, with 2% to 3% (mass percentage of carbon black) of chelated titanate coupling agent to improve solid liquid two-phase interfacial compatibility, suitably dibutyl tin dilaurate increase the amount of use of high activity foam stabilizers, carbon black can be alleviated to the adverse effects of the foaming process, to obtain physical and electrical conductivity than the desired conductive sponge.

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