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Issue 28, 2019
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3D printable robust shape memory PET copolyesters with fire safety via π-stacking and synergistic crosslinking

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Abstract

The practical problems of insufficient mechanical strength, poor processability, tedious synthesis and flammability facing shape memory polymers have limited their further usage in industrial fields, especially in construction and aerospace. A novel and very simple method of ternary polymerization is presented here to prepare multi-functional copolyesters from general poly(ethylene terephthalate) (PET) through the new well-designed third monomer that features pendent phenylacetylene–phenylimide units. The π–π stacking between phenylacetylene groups as a reversible net-point not only endows the copolyesters with good shape memory and self-healability, but also reinforces the interchain interaction, leading to high tensile strength (79.6–89.6 MPa). Interestingly enough, the phenylacetylene can synergistically crosslink with the unsaturated C[triple bond, length as m-dash]N group generated from the phenylimide during burning, resulting in excellent flame retardancy. Thermoplastic smart copolyesters can be designed into fire alarms and can also be used for 3D printing. The printed geometries exhibit good shape memory behaviors, which could be deformed into a small size to save space during transportation/storage and allow manufacturing freedom for space applications.

Graphical abstract: 3D printable robust shape memory PET copolyesters with fire safety via π-stacking and synergistic crosslinking

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Article information


Submitted
22 Apr 2019
Accepted
24 Jun 2019
First published
24 Jun 2019

J. Mater. Chem. A, 2019,7, 17037-17045
Article type
Paper

3D printable robust shape memory PET copolyesters with fire safety via π-stacking and synergistic crosslinking

L. Chen, H. Zhao, Y. Ni, T. Fu, W. Wu, X. Wang and Y. Wang, J. Mater. Chem. A, 2019, 7, 17037
DOI: 10.1039/C9TA04187G

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