Preparation And Properties Of Hindered Phenol Modified Polymer Damping Materials

Recent years, high performance damping materials were made from functional organic small molecule/hindered phenol hybrids. It was regarded as creating a new concept and method to prepare high performance damping materials. Materials were prepared by adding organic small molecule hindered phenol or hindered amine to polymer matrix. Intermolecular hydrogen bonds could be formed between polar polymer matrix and organic small molecule. These hydrogen bonds will be dissociated when the material is used in alternate stress. The dissociation process will dissipate much energy, so the material exhibit excellent damping performance.In this thesis, damping materials with high loss factor and wide damping temperature range were prepared by adding different kinds of organic small molecule hindered phenol to carboxyl styrene-butadiene rubber, polyurethane/ poly(isobutyl methacrylate) interpenetrating polymer networks and polyurethane/poly(isobutyl methacrylate-butyl acrylate) interpenetrating polymer networks. Major work is as follow:1. Carboxyl styrene-butadiene rubber/hindered phenol composites were prepared by adding different hindered phenols to carboxyl styrene-butadiene rubber matrix. The influence of different hindered phenol on mechanical properties and damping properties of carboxyl styrene-butadiene rubber was investigated. Damping temperature range was increased by blending or lamilating with other rubbers.2. Polyurethane/poly(isobutyl methacrylate) and polyurethane/poly (isobutyl methacrylate-butyl acrylate) interpenetrating polymer networks which filled with hindered phenol AO-70 were synthesized. The IPNs synthesized by one-shot method are better than those synthesized by two-shot method. When the IPNs are synthesized under appropriate conditions:curving temperature is 100℃, mass ratio of polyurethane to polyacrylate is 60/40, mole fraction of crosslinking agent divinylbenzene base on acrylate is 1.5%, and mass of AO-70 is 40 percentages of IPNs, temperature range of IPNs which loss factor is higher than 0.3 is over 130℃.3. Polyurethane elastomers were synthesized by one-step method. The influence on mechanical and damping properties filled with hindered phenol and polystyrene hollow micro sphere was investigated.