A New Route for Evaluating Short Chain Branching Distribution of High Density Polyethylene by Measuring Crystallizability of Molar Mass Fractions

oleh: Andres KRUMME, Monika BASIURA, Thijs PIJPERS, Geert VANDEN POEL, Lars Christian HEINZ, Robert BRÜLL, Vincent B. F. MATHOT

Format: Article
Diterbitkan: Kaunas University of Technology 2011-09-01

Deskripsi

A bimodal high density polyethylene (HDPE) has been successfully fractionated by analytical size exclusion chromatography into molar mass fractions with <em>M<sub>w</sub></em>'s ranging from 3.6&nbsp;kg/mol to 8<sub>&nbsp;</sub>000&nbsp;kg/mol, and subsequently deposited on germanium disks using the Lab Connections Transform method. After removal of the fractions from the disks, having masses in between 10&nbsp;&micro;g<sub>&nbsp;</sub>-<sub>&nbsp;</sub>150&nbsp;&micro;g, differential scanning calorimetry has been successful in measuring the (re)crystallization and melting behavior of these fractions. Comparing the crystallization and melting peak temperatures of the fractions with those of narrow molar mass linear polyethylenes points to the HDPE being linear below and short chain branched above 100&nbsp;kg/mol respectively. This value coincides roughly with the 'split' between the molar mass distributions resulting from the first and the second polymerization reactor - confirming the addition of 1-butene in the second reactor.<p><a href="http://dx.doi.org/10.5755/j01.ms.17.3.590">http://dx.doi.org/10.5755/j01.ms.17.3.590</a></p>