天然橡胶硫化胶的热氧老化性研究.pdf

2006 35 2 21 , (西北工业大学高分子研究所, 陕西西安, 710072) : ( TGADSC) - ( PGC - M S) , , , , , , , 1, 4--4- : , , , , - : TQ 332 Analyzing Thermo-oxidation Aging ofNR Vulcanizate by U sing ThermalAnalysis and PGC-M XIAO Yan, W E I B -r ng ( P lymer Institute fN rthw estern P lytechn icalU niversity, X ipan 710072, Shanx,i China) Abstract: In the paper, in rder t reveal the agingmechanism and aging stab ility fnatural rubber( NR) vulcan- izate, the thermal analysis and pyr lysis gas chr mat graph-mass spectra( PGC-M S) w ere perf rmed, The expermi en- tal resu lts sh w ed thatmechan ical pr perty and cr sslink density increased at the initial stage f aging, wh ile degrada- ti n effect becamem re superi r w ith aging tmi e increasing, wh ich resu lted in the decreasing f hardness, therm al stability and cr sslink density. S me pyr lysismechan ism f NR was pr p sed that the main chain w ith d uble b nd w as cracked at first, wh ich led t a series f chain reacti n, and the pr ducts arem n mer and s me fragments. Key words: natural rubber, aging, therm gravmi etric analysis, PGC-MS, differential scanning cal rmi etry ( NR), , , , - , , , , 1 , , NR 111 , () , , , 112 , NR 11211 , GB 3512-83, , , , 100e , , 1226 44,