Deriving comprehensive structural information on long-chain branched polyethylenes from analysis of thermo-rheological complexity. (8th November 2016)

• Record Type: Journal Article
• Authors: Stadler, Florian J.; Chun, Yong Sung; Han, Jae Hyuck; Lee, Eunwoong; Park, Seung Ho; Yang, Chun Byung; Choi, Changhyun
• Is Part Of: Polymer. Volume 104(2016)
• Page Start: 179
• Page End: 192
• Publication Date: 2016-11-08
• Subjects: Long-chain branched polyethylene -- Thermorheological analysis -- Activation energy spectrum; Polymers -- Periodicals; Polymerization -- Periodicals; Polymères -- Périodiques; Polymérisation -- Périodiques; 547.7
• DOI: 10.1016/j.polymer.2016.07.084
• Languages: English
• ISSNs: 0032-3861

Abstract

Abstract: An advanced analytic method, based mainly on thermorheological analysis of standard frequency sweeps at several temperatures, is introduced which can determine a host of rheological indicators for long-chain branched polyethylenes and other materials with an Arrhenius-type temperature dependence. The method can be used to classify and categorize unknown samples to material types (tubular and autoclave low density polyethylene, long-chain branched metallocene polyethylene). For long-chain branched metallocene polyethylenes, it is, furthermore, possible to determine molar mass and branching degree using established relations with rheological behavior. It is, therefore, possible to gain a rather comprehensive picture of the molecular structure of long-chain branched polyethylenes using only a relatively simple set of rheological experiments. An automated analysis routine facilitates the evaluation. Graphical abstract: Highlights: Thermorheological branching analysis from linear-viscoelastic data. Fully automatic analysis routine. Finds characteristic points and further analyzes them. Classification and comparison according to topography.