Study on Mechanical Properties and Morphological Structure of PP-R Toughened by Ethylene/Styrene Interpolymer(ESI)

Mechanical properties of PP R/ESI24 alloys were studied.The results indicated that 20 % ESI24 was essential to make PP R super toughened,with an Izod impact strength reaching as high as 828.33 J/m.Moreover,the impact properties of the alloys improved with the increase of the ESI24 content,while their tensile properties did not show significant decline.In addition,the elongation at break of the alloys was greatly improved while the elastic modulus reduced very slowly.Through sub microcosmic morphology analysis for PP R/ESI24 alloys,it was found that super toughened PP R/ESI24 alloys displays an exclusive breaking surface,which is different from the toughening break of usual polymer materials.The toughening mechanism conformed to the“multi layer crack extension”mechanism brought forward by our reseach team.