تهيه و بررسي خواص فيزيكي- مكانيكي آلياژ NR/BR/ENR/EPDM-g-GMA به عنوان آميزه ي ديواره جانبي تاير وسايل نقليه سنگين

چكيده انگليسي :

Preparation and investigating physico mechanical properties of NR BR ENR EPDM g GMA alloy as side wall of tire for heavy vehicles Mansooreh Ravanbakhsh m ravanbakhsh@ce iut ac ir Date of Submission 13 1 2014 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Saied Nouri Khorasani saied@cc iut ac irAbstractIn this research glycidyl methacrylate GMA which is a di functional monomer was used to graftEPDM The grafted EPDM EPDM g GMA was used to eliminate the use of antiozonant andovercome the problem of distribution and co curing in NR BR EPDM blend Also in the blend ofNR BR ENR EPDM g GMA epoxidized natural rubber ENR was used due to its inherent polarity inits epoxide rings which in turn can react with epoxy pendant group in EPDM g GMA from one end and from other end which is non polar to NR Fourier transfer infrared FTIR and titration resultsconfirms grafting of EPDM with 6 GMA Blends of NR BR ENR EPDM g GMA with differentamount of GMA i e 5 10 30phr were prepared Some mechanical properties of NR Br ENE EPDM g GMA blend NR BR ENR EPDM blend and NR BR with which is an antiozonant in side wall oftire were determined and compared Results obtained from NR BR ENR EPDM g GMA shows auniform distribution of ingredients filler curing agents in blends containing GMA Tensileproperties tearing strength and ozone resistance of blend containing GMA were significantlyimproved compared to blend with EPDM without graft and NR BR containing 6PPD Comparing theresults the blend containing 5phr EDM g GMA shows optimum properties in comparison with otherblends containing 10 and 30phr GMA In compound GMA 5 GMA 10 after 100 hours underdescribed test condition no crack observed It is due to fact that presence of epoxy groups that reactwith ozone and produce ketone compounds Ketone groups provide a good ozone resistance in samplesrelated to Ref 0 flows at edges were observed Staining at surface of sample Ref 1 were observed Although in these sample flows from edge developed to flows in the middle of sample but sample didnot tear after 100 hours the reason of lower ozone resistance Compared to Ref 0 GMA 5 GMA 10 islack of compatibilizer in compound Compound GMA 30 after 18 hours exposure to ozone crackedand after 90 hours teared The reason is lower compatibility in compound and therefore phaseseparation occurred Tear strength of 460 KN cm tensile strength of 24 18 MPa and elongation atbreak of 442 were reported which is 46 5 13 7 and 4 8 improved properties compared toNR BR containing 6PPD Results clearly indicate increase of tear strength up to 10phr of EPDM g GMA This is due to fact that EPDM has low tear strength and also may be due to poor distributionand lower cross link density The novelty of this research is the first time ENR were used in the blendof NR BR EPDM with significant effect on co curing of NR BR which is fast curing with EPDMwhich is slow curing Physico mechanical properties of NR BR ENR EPDM g GMA in comparisonwith NR BR ENR EPDM NR BR superior For the first time ENR was used in compound ENR hasproperties that is related as engineering polymers The obtained results are 36 5 better than it wasreported by other researcher on tear resistance and tensile strength The best results obtained withoptimum level EPDM g GMA Key words Ozone resistance NR BR ENR EPDM g GMA Tensile properties Tear strength

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تهيه و بررسي خواص فيزيكي- مكانيكي آلياژ NR/BR/ENR/EPDM-g-GMA به عنوان آميزه ي ديواره جانبي تاير وسايل نقليه سنگين

خواص كششي , مقاومت پارگي , مقاومت ازوني