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HOZA, A. KRATOCHVÍLA, J. HERMANOVÁ, S.
Original Title
THE WAY OF STEREOREGULARITY DETERMINATION OF POLYPROPYLENE
Type
journal article - other
Language
English
Original Abstract
The purpose of this contribution is to evaluate and compare isotactic index determination of polypropylene homopolymer by extraction and solubility methods. A series of nine PP powder samples possessing molecular weights in the range from 29 -103 to 154-03 g/mol was investigated. Both the methods afforded fractionation of polypropylene into two portions, the soluble fraction and the insoluble one. Extractions were carried out in a modified Kumagawa extractor. Solvent extracts were obtained from polypropylene powders using several organic solvents (n-pentane, n-hexane, n-heptane, and n-octane) at their boiling points. Soluble fractions were prepared by dissolving polypropylene powder in high boiling solvents (xylene, decahydronaphthalene, and 1,2,3,4-tetrahydronaphthalene) and cooling polymer solutions to 23 degree C. All the fractions were characterized using 13C-NMR, DSC, and SEC methods. Comparison of extraction and solubility methods showed a significant differences in the amount, structure, molecular weight, and crystalinity of soluble and insoluble fractions
Keywords
Isotactic index, polypropylene, extraction
Authors
HOZA, A.; KRATOCHVÍLA, J.; HERMANOVÁ, S.
RIV year
2008
Released
9. 9. 2008
ISBN
1213-7103
Periodical
Chemické listy
Year of study
102
Number
15
State
Czech Republic
Pages from
s1202
Pages to
s1206
Pages count
5