Entanglement relaxation of poly(1-butene) and its copolymer with ethylene detected in conventional shear rheometer and quartz resonator

Liu, C., Liu, P., Chen, Q., Du, B. and Wang, Z. (2019) Entanglement relaxation of poly(1-butene) and its copolymer with ethylene detected in conventional shear rheometer and quartz resonator. Journal of Rheology, 63 (1). pp. 167-177. ISSN 0148-6055 doi: 10.1122/1.5051041

Abstract/Summary

This study examined linear viscoelasticity (LVE) of stereo-regular poly(1-butene) (PB) and its random copolymer with polyethylene, with number fraction of ethylene comonomer ≤10%, using a conventional shear rheometer combined with a quartz resonator. This combination resulted in the detection of LVE in a broad frequency range from Rouse region to terminal relaxation. LVE, thus, determined was fit to the double reptation model through utilizing inputting molecular weights determined by gel permeation chromatography equipped with refractive index and two-angle laser light scattering monitors, and the segmental time and entanglement molecular weight as the two fitting parameters. A quantitative prediction was finally achieved when the two fitting parameters changed systematically by the increase of ethylene content, a decrease of segmental time quantified a plasticizing effect, and a decrease of entanglement molecular weight reflected enhanced the chain flexibility. The entanglement molecular weight of the PB samples was found to be lower than those reported for stereo-irregular PB, suggesting the important effect of stereo-regularity on the chain flexibility.

Item Type	Article
URI	https://reading-clone.eprints-hosting.org/id/eprint/81512
Identification Number/DOI	10.1122/1.5051041
Refereed	Yes
Divisions	Science > School of Mathematical, Physical and Computational Sciences > Department of Mathematics and Statistics
Publisher	Society of Rheology
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