Three-Dimensional Printed Shape Memory Objects Based on an Olefin Ionomer of Zinc-Neutralized Poly(ethylene-co-methacrylic acid)

Zhiyang Zhao, Fang Peng, Kevin A. Cavicchi, Mukerrem Cakmak, R. A. Weiss, Bryan D. Vogt

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

Three-dimensional printing enables the net shape manufacturing of objects with minimal material waste and low tooling costs, but the functionality is generally limited by available materials, especially for extrusion-based printing, such as fused deposition modeling (FDM). Here, we demonstrate shape memory behavior of 3D printed objects with FDM using a commercially available olefin ionomer, Surlyn 9520, which is zinc-neutralized poly(ethylene-co-methacrylic acid). The initial fixity for 3D printed and compression-molded samples was similar, but the initial recovery was much lower for the 3D printed sample (R = 58%) than that for the compression-molded sample (R = 83%). The poor recovery in the first cycle is attributed to polyethylene crystals formed during programming that act to resist the permanent network recovery. This effect is magnified in the 3D printed part due to the higher strain (lower modulus in the 3D printed part) at a fixed programming stress. The fixity and recovery in subsequent shape memory cycles are greater for the 3D printed part than for the compression-molded part. Moreover, the programmed strain can be systematically modulated by inclusion of porosity in the printed part without adversely impacting the fixity or recovery. These characteristics enable the direct formation of complex shapes of thermoplastic shape memory polymers that can be recovered in three dimensions with the appropriate trigger, such as heat, through the use of FDM as a 3D printing technology.

Original languageEnglish (US)
Pages (from-to)27239-27249
Number of pages11
JournalACS Applied Materials and Interfaces
Volume9
Issue number32
DOIs
StatePublished - Aug 16 2017

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Ionomers
Alkenes
Shape memory effect
Olefins
Zinc
Ethylene
Recovery
Acids
Printing
3D printers
Polyethylene
Thermoplastics
Extrusion
Polyethylenes
Polymers
Porosity
methacrylic acid
ethylene
Crystals
Costs

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

Cite this

Zhao, Zhiyang ; Peng, Fang ; Cavicchi, Kevin A. ; Cakmak, Mukerrem ; Weiss, R. A. ; Vogt, Bryan D. / Three-Dimensional Printed Shape Memory Objects Based on an Olefin Ionomer of Zinc-Neutralized Poly(ethylene-co-methacrylic acid). In: ACS Applied Materials and Interfaces. 2017 ; Vol. 9, No. 32. pp. 27239-27249.
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Three-Dimensional Printed Shape Memory Objects Based on an Olefin Ionomer of Zinc-Neutralized Poly(ethylene-co-methacrylic acid). / Zhao, Zhiyang; Peng, Fang; Cavicchi, Kevin A.; Cakmak, Mukerrem; Weiss, R. A.; Vogt, Bryan D.

In: ACS Applied Materials and Interfaces, Vol. 9, No. 32, 16.08.2017, p. 27239-27249.

Research output: Contribution to journalArticle

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