Synthesis And Characterization Of Organosilicon Modified Polyether Urethane

Polyurethane elastomer material is of special interest for better physical andmechanical properties, but its applying scope is limited for some disadvantages. Newpolymer modification approach can improve the performance of the material. Moreover,organic silicon polymer material with outstanding properties can offset the inadequacy ofpolyurethane materials. Therefore, the combination of organic silicon polymer andpolyurethane elastomer material through chemical processing will generate polymermaterials with better performance.In this study, polyether urethane block polymer was synthesized with3-Isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate (IPDI),poly(tetramethyleneglycol)(PTMG) and1,4-butanediol (BDO) as chain extender, and theoptimum synthetic technology conditions were determined via investigating prepolymerssynthesis reaction process. The results, with FTIR、TGA, DSC and GPC performancetesting, suggested that the polyurethane heat resistance decreased gradually with hardsegment content increasing and the thermal decomposition process was in two phases, thetemperature of glass transition was gradually reduced as well. The color and yellow indexanalysis showed that the color retention of polyurethane elastomer had been graduallyimproved with hard segment content increasing which also affected its mechanicalproperties and the breaking elongation reached the highest when hard segment content was50%. In conclusion, the polyurethane elastomer with better performance can be obtainedwhen the hard segment content was50%.Orgasiloxane modified polyether were synthesized by polydimethylsioxane (PDMS)block copolymer. Reaction temperature and time were determined. Meanwhile, FTIR,GPC, TGA and DSC were carried to characterize the products. The results indicated theorganic silicon chain segments had been embedded into the polyurethane macromoleculeschain segments. Furthermore, mechanical properties and yellowing resistance testing wereemployed to investigate the affect of different silicone content on the performance ofpolyurethane, and the results showed the polyurethane elastomer molecules graduallyincreased and thermostability was improved with the polyurethane elastomer molecules increasing, contemporarily, the glass-transition temperature reduced and yellowdegeneration was improved. The mechanical testing shows that it reached the optimalperformance when the organic silicon content was15%.