Research On Synthesis Of Damping Materials And Its Properties

Many kinds of mechanism have different degree on vibration and noise.Damping technology is one of the most efficient methods to control them.Damping materials are new type material which could translatemechanical energy into heat and release. Macromolecule material iswidely use for damping material because its particular structure whichcan lose heat easily. Whereas, common macromolecule material'stemperature range with high tanδis very thin. Moreover, being a usefuldamping material, it must have a high tanδwith large temperature range.General speaking, there are three section to bring the macromolecule'sdamping property: (1)The inside attrition of macromolecule;(2)Theinteraction with filling and macromolecule material;(3)The interactionwith filling itself. PU's Tg is low, if PU could blend some materials whichhave high Tg then the product would have a high temperature range andbetter damping property for use. PU damping material for its structurecan be divide into several form:damping bond; damping foam;damping elastomer; etc. Noise not only hurt hearing system of human being butalso threaten building's structure and instrument's precision. Noisecontrol arose lots of scientists' recognition. In is paper, I choosepoly-urethane,poly- styrene(PU) and (PS) andpoly-(methyl-methacrylate; butyl-methacrylate)[P(MMA-BMA)] tosynthesize interpenetrating network polymer(IPN) damping materials.The work including following:(1) discussed the different dosage of catalyst and crosslinking agent anddistinct method of Synthesis contribute to the PU/PS IPN dampingmaterial's properties not only in dynamic mechanical analysis(DMA)but also in mechanical properties. The IPN material with 15mgcatalyst and 1.5 % crosslinking agent(mass ratio) by two steps bulkSynthesis can get a good damping property.(2) A series of polyurethane/poly(methyl-methacrylate-butylmethacrylate)(PU/P(MMA-BMA)) interpenetrating polymernetworks(IPN) polymers with good damping properties weresynthesized via bulk polymerization method, also the dampingproperties of the IPN polymers were characterized by dynamicmechanical analysis. The with catalyst, temperature during thepost-processing, the cross-linking agent and the mass ratio of PU toPMMA-BMA were investigated to see how they influenced thepolymer's damping properties. The IPN polymers were synthesized with dibutyltin dilaurate as catalyst, mole ratio of cross-linkingagent(divinylbenzene) to P(MMA-BMA) equaling to 1.5: 100 and itcan be indicated from the results that these IPN polymers with similarmass of PU and P(MMA-BMA) or a little more P(MMA-BMA) haveexcellent damping properties after post-processing at hightemperature.