6533b85ffe1ef96bd12c0fb3
RESEARCH PRODUCT
Kristallisation und schmelzverhalten von fraktionen verzweigten polyethylens, 1. Darstellung und charakterisierung der fraktionen
Gert StroblEugeniusz Madereksubject
chemistry.chemical_compoundChemistryDispersityPolymer chemistryPartial meltingMolar mass distributionFractionationCalorimetryPolyethyleneMelting curve analysisMethyl groupdescription
A branched polyethylene with broad molecular weight distribution was separated into a series of fractions by fractional precipitation from dilute solution. The fractions were characterized by viscometric and density measurements, IR-spectroscopy and calorimetry. The methyl group content and the density turned out as largely constant. Molecular weight effects show up in the melting behaviour. The main range of melting and the end of the melting curve shift to lower temperatures with decreasing molecular weight. Compared to the overall extension of the melting range these shifts are small. One has to conclude that polydispersity gives only a minor contribution to the broadening of the melting range, partial melting being mainly caused by the branches.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1983-12-01 | Die Makromolekulare Chemie |