Issue 6, 2021

Inducing nano-confined crystallization in PLLA and PET by elastic melt stretching

Abstract

Based on the widely studied poly(L-lactic acid) (PLLA) and polyethylene terephthalate (PET) that are brittle in their fully crystalline form, this Letter shows that they can be made to be super ductile, heat resistant and optically clear by creating nano-sized crystals while preserving the entanglement network. Atomic force microscopic images confirm the perceived nano-confined crystallization. Time-resolved X-ray scattering/diffraction measurements reveal the emergence of cold crystallization during either stress relaxation from large stepwise melt-stretching or annealing of pre-melt-stretched PLLA and PET above Tg. Mechanical tests show that these polymers in such a new state are rigid even well above Tg, e.g., at 100 °C.

Graphical abstract: Inducing nano-confined crystallization in PLLA and PET by elastic melt stretching

Supplementary files

Article information

Article type
Communication
Submitted
11 Dec 2020
Accepted
19 Jan 2021
First published
04 Feb 2021

Soft Matter, 2021,17, 1457-1462

Inducing nano-confined crystallization in PLLA and PET by elastic melt stretching

M. Razavi, W. Zhang, H. A. Khonakdar, A. Janke, L. Li and S. Wang, Soft Matter, 2021, 17, 1457 DOI: 10.1039/D0SM02181D

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