Journal article
Characterizing long-chain branching in commercial HDPE samples via linear viscoelasticity and extensional rheology
Rheologica acta, v 59(11), pp 797-807
01 Nov 2020
Abstract
It is well established that polymer chain architecture and the distribution of molecular weight play a key role in the flow behavior (processing) and performance of a given polymer material. Long-chain branching (LCB) in particular is known to strongly affect the processability and the material performance of polymers. Often branching is a result of the polymerization process and therefore must be quantified in every sample. We study four commercial high-density polyethylene (HDPE) samples with unknown degrees of polydispersity and LCB. We first use size-exclusion chromatography and linear shear rheology to identify differences in molecular weight, polydispersity, and LCB. Each material is then tested in constant rate and constant stress uniaxial extension using a filament stretching rheometer to quantify extensional viscosity and strain hardening. Correlations between nonlinear extensional rheology, LCB and polydispersity are discussed. We show that the combination of the van Gurp-Palmen plot and extensional rheology allows for a full characterization of the LCB fraction and their effect on extensional rheology.
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Details
- Title
- Characterizing long-chain branching in commercial HDPE samples via linear viscoelasticity and extensional rheology
- Creators
- Samantha L. Morelly - Drexel UniversityNicolas J. Alvarez - Drexel University
- Publication Details
- Rheologica acta, v 59(11), pp 797-807
- Publisher
- Springer Nature
- Number of pages
- 11
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Chemical and Biological Engineering
- Web of Science ID
- WOS:000574735300001
- Scopus ID
- 2-s2.0-85091804856
- Other Identifier
- 991019167844404721
InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Web of Science research areas
- Mechanics