Issue 35, 2022

Investigation of the synergistic effect of melt-extension and nanofiller on the crystal–crystal phase transition from form II to I of isotactic polybutene-1

Abstract

New questions and conjectures are raised on the crystal–crystal phase transition of isotactic polybutene-1 (iPB-1) containing nanofiller in the flow field. In this work, we investigate the phase transition from flow-induced oriented form II to I in iPB-1 blends with multi-walled carbon nanotubes (MWCNTs) with a homemade two-drum extensional rheometer combined with in situ wide-angle X-ray diffraction (WAXD) measurements. The MWCNTs show a limited promoting effect on the phase transition kinetics under quiescent conditions, while the phase transition kinetic is highly accelerated with the impose of melt-extension. When the loading extension strain is 0.5 or 2.0, the half time of phase transition (t1/2) is shortened from tens of hours to a few hours, depending on the melt-extension strain and the MWCNTs content in iPB-1. When the extension strain increases to 3.5, t1/2 decreases to about 30 min, which is independent of the MWCNTs content in all iPB-1 blends except in blends with MWCNTs content of 1%, where the phase transition rate in the middle and late stages is restrained. It's speculated that flow-induced molecular orientation or shish-kebab morphology affects the internal stress or stress transfer. The addition of a nanofiller enlarged the effect of melt-extension through strengthening the localized intensity of flow field. In general, the combination of nanofiller and melt-extension can obviously promote the phase transition kinetics.

Graphical abstract: Investigation of the synergistic effect of melt-extension and nanofiller on the crystal–crystal phase transition from form II to I of isotactic polybutene-1

Supplementary files

Article information

Article type
Paper
Submitted
24 Jun 2022
Accepted
30 Jul 2022
First published
04 Aug 2022

Soft Matter, 2022,18, 6572-6581

Investigation of the synergistic effect of melt-extension and nanofiller on the crystal–crystal phase transition from form II to I of isotactic polybutene-1

Y. Zhang, W. Wei, Y. Liu, Y. Ji, F. Su and C. Liu, Soft Matter, 2022, 18, 6572 DOI: 10.1039/D2SM00841F

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