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【答案】应助回帖
天上天(金币+200, 翻译EPI+1): 2011-05-19 19:20:19
This paper synthetizes higher conductive rate polyaniline, polypyrrole and PcCu first,then on the basis of the experienced research,according to different film technology,using self-made conductive polymers synthetizes conductive macromolecule sound-absorbing material.Meanwhile different factors of
material was researched.
In suspension polymerization, dispersion polymerization and emulsion polymerization methods,according to the molecular structure design of conductive polymers,the prerequisite is that the solubility and conductivity of polymer,synthetizes conjugate and conductive polymer with a series of different structure and grain size,such as polyaniline, polypyrrole, carboxyl PcCu and so on.Then uses epoxy resin and polyamide resin as the matrix constraint materials of sound-absorbing material .On preparation of conductive polymer particles on the assembling and acoustic properties research.And analyzes the influence of graphite to blend sound-absorbing material in polyaniline.At the same time, through optimizing the process ,under stability conditions,prepares of conductive polymers and graphite composite sound-absorbing material.This paper analyzes the influence of sound-absorbing material and performance through the mixing time, conductivity, surface microstructure, material thickness, test method.Experiments showed that electrical conductivity of conductive polymer , material thickness, material structure and material sound-absorbing properties will produce significant influence.This shows the conductivity, thickness, microcosmic structure are closely related to material factors such as the acoustic properties.Through controlling the number of conductive polymer particles and graphite，it is completely feasible to prepare high electric conductivity film to the study of sound-absorbing properties.Certain conditions, realizing the polymer particles characteristic impedance and gap of air acoustic impedance matching can effectively improve the material sound-absorbing performance.On the basis of the above work, preparated of conductive polymer film sound-absorbing material combining with graphite.The result shows that the conductive polymer with flexible structure is composed of film sound-absorbing material with wide and the strong absorption ability.In 125Hz ~ 4000Hz average absorption coefficient exceeds 0.5, maximum acoustic absorption coefficients reaches 0.95,especially solved defects which sound-absorbing material is poor in low frequency range.This sound-absorbing film quality is light and thin, thickness is only 0.1 ~ 0.6 millimeter, every square metre weighs only 200 ~ 500 grams. |
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