| Polyurethane elastomer is made up of isocyanate and polyol reaction after the hard and soft segment block copolymerization of polymer production, provide good flexibility of soft segment and hard segment provides physical junction, because the structure of the hard and soft segment block polyurethane elastomer itself, excellent design can be endowed with polyurethane materials. The viscoelasticity of polymer materials because of its itself, is the key of the damping material research field. The polyurethane material with excellent structure can be designed and diversity and performance, is the most commonly used in the polymer damping materials research to the material. But a single component polyurethane damping materials is very difficult to meet the diversified demand now, so you need to a single of polyurethane damping materials were modified, to improve the damping performance, broaden the use damping temperature.This article mainly through the molecular structure of polyurethane elastomer damping material design, block and graft modification methods such as modification of polyurethane elastomer is studied, and study the effects of molecular structure and modification methods on the properties of ceramic materials, further discusses the influence on damping performance. The main research contents and the main conclusive results were as follows:1. In the first place, with hydroxyl-terminated polydimethylsiloxane(HTPDMS) and hydroxyl-terminated polybutadiene (HTPB) as a blend of soft segment and diphenyl methane diisocyanate (MDI) block copolymerization reaction, a shrinkage dipropylene glycol (DPG) and glycerol (GLY) as chain extender, by pre polymers prepared polyurethane elastomer damping materials. The results show that with block copolymerization of HTPDMS chain segment content increases, the tensile strength of the material is reduced, the chain segment enhanced flexibility, elongation at break increased, material damping factor is reduced, the effective damping temperature moving in the direction of low temperature, surface hydrophobicity increase at the same time; When material crosslinking degree rise, higher tensile strength, elongation at break decreased, surface hydrophobicity changed little, damping temperature no change, damping factor significantly reduced, and thermal stability improved.2. The use of hydroxyl-terminated polydimethylsiloxane (HTPDMS)and hydroxyl-terminated poly acrylonitrile (HTBN) as a blend of soft segment and diphenyl methane di isocyanate (MDI) block copolymerization reaction, a shrinkage dipropylene glycol (DPG) and glycerol (GLY) as chain extender, by pre polymers prepared polyurethane elastomer damping materials. The results show that with block copolymerization of HTPDMS chain segment content increases, the tensile strength of the material is reduced, the chain segment enhanced flexibility, elongation at break increased, material damping factor increases, the effective damping temperature moving in the direction of low temperature, surface hydrophobicity increase at the same time; When material crosslinking degree rise, higher tensile strength, elongation at break decreased, surface hydrophobicity changed little, damping temperature no change, damping factor significantly reduced, and thermal stability improved.3. The use of hydroxyl-terminated polydimethylsiloxane (HTPDMS)and hydrogenated hydroxyl-terminated polybutadiene (H-HTPB) as a blend of soft segment and diphenyl methane diisocyanate (MDI) block copolymerization reaction, a shrinkage dipropylene glycol (DPG) and glycerol (GLY) as chain extender, by pre polymers prepared polyurethane elastomer damping materials. The results show that with block copolymerization of HTPDMS chain segment content increases, the tensile strength of the material is reduced, the chain segment enhanced flexibility, elongation at break increased, material damping factor is reduced, the effective damping temperature moving in the direction of low temperature, surface hydrophobicity increase at the same time; When material crosslinking degree rise, higher tensile strength,elongation at break decreased, surface hydrophobicity changed little,damping temperature no change, damping factor significantly reduced,and thermal stability improved4. Use the seven three methyl siloxane grafted hydroxyl-terminated polybutadiene, then with diphenyl methane diisocyanate (MDI) and backwards dipropylene glycol chain extender (DPG) by pre polymers is polyurethane elastomer damping. When grafted silicone content increased,the damping properties increase significantly, crosslinking degree and in damping effect of the polymers NCO value on the smaller; Material mechanics performance by the crosslinking degree and NCO value increase significantly, grafting quantity increases in material mechanics performance; Hydrophobic properties increase significantly at the same time, the thermodynamic stability improved.5. The seven three methyl siloxane grafted hydroxyl-terminated polybutadiene (HMTS -g- HTPB) and polyethylene tetrahydrofuran ether glycol (PTMEG2000) as a mixed segment, and then with diphenyl methane diisocyanate (MDI) and backwards dipropylene glycol chain extender (DPG) by pre polymers is polyurethane elastomer damping. By adjusting the ratio of soft segment between two phase, with the increase of HMTS-g-HTPB content, to the higher mechanical properties, hydrophobic performance improvement, thermal stability,damping performance. |
