کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5186689 | 1381111 | 2006 | 6 صفحه PDF | دانلود رایگان |
High melt viscosity polypropylene was manufactured by grafting bifunctional monomers, HDDA (1,6-hexanediol diacrylate) and TPGDA (tripropyleneglycol diacrylate), onto homo-polypropylene under an electron beam irradiation. Melt complex viscosity (ηâ) of modified polypropylene was sensitive to irradiation dose and monomer content. The melt viscosity of the polypropylene modified with TPGDA increased to 132,290 Pa s (at 190 °C and 0.1 rad/s of frequency) from 5039 Pa s for virgin homo-polypropylene. TPGDA monomer could give higher melt viscosity at low dosages than HDDA monomer, probably due to the structural feature of TPGDA with three numbers of methyl groups.Modified polypropylene with high melt complex viscosity had a broad molecular weight distribution with remarkable shift to higher molecular weight leading to high values of both M¯w/M¯n and M¯z/M¯w. Melt viscosity of modified polypropylene could be properly correlated by the equation ηâ=kt(M¯w/M¯n)α(M¯z/M¯w)β, where the term (M¯z/M¯w) gave a dominant effect for the estimation of ηâ.
Journal: Polymer - Volume 47, Issue 19, 7 September 2006, Pages 6592-6597