Article ID Journal Published Year Pages File Type
5186689 Polymer 2006 6 Pages PDF
Abstract

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 (η∗) 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 η∗=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 η∗.

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Physical Sciences and Engineering Chemistry Organic Chemistry
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