| This project studied three systems, which can be used in different fields--methyl methacrylate-styrene/polyurethane by one-step process, methyl methacrylate- styrene/polyurethane by two-step process, the prepolymer of methyl methacrylate-styrene/ polyurethane. The influence of the reactivity, storage life, and the mechanical properties of the three systems is studied. The results show that -NCO/-OH (R) , the molar rate of hydroxyl of binary alcohol and polyols (a ) ,the initiator, accelerator, dibutyltin dilaurate (P) as the catalyzer, the content of vinyl monomer (y) , the content of divinylbenzene as the linker of styrene (e ) , and fillers content have effects on reaction rate and mechanical properties in more or less degree. From the study, we can draw a conclusion that the three systems have good properties, and can be used in many occasions; the first system have best peffomiance compared with other two systems, and when R1.10, a 0.50,BPO/ (MMA+St) =1.6%, DMA! (MMA+St) =0.9%, e =4%, P =0.04%, y =30%,with 30-35% ~~o2 in the component of polyols, the modified system exhibits suitable reactivity with 80mm gel-time and can be completely cured alter 48 hours at the room temperature. Simultaneously the glue line possesses favorable properties: the tensile strength is 26.OMPa, breaking elongation 300%, permanent deformation 10.0%, the loss of strength alter thermal air aging and acid corrosion are -1.0% and 0.06% respectively, the Shore hardness 88 (D) and extensional shearing strength is 15.OMPa (ABS-ethylene propylene terpolymer) ,can be used in most occasions especially as an embedded material or as a casting material in wiring. |
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