Tailoring Interfacial Interactions via Polymer-Grafted Nanoparticles Improves Performance of Parts Created by 3D Printing

Street, Dayton P.; Mah, Adeline Huizhen; Ledford, William K.; Patterson, Steven; Bergman, James A.; Lokitz, Bradley S.; Pickel, Deanna L.; Messman, Jamie M.; Stein, Gila E.; Kilbey, S. Michael

doi:10.1021/acsapm.9b01195

Tailoring Interfacial Interactions via Polymer-Grafted Nanoparticles Improves Performance of Parts Created by 3D Printing

Journal Article · Mon Feb 10 00:00:00 EST 2020 · ACS Applied Polymer Materials

DOI:https://doi.org/10.1021/acsapm.9b01195· OSTI ID:1659566

Street, Dayton P. ^[1]; Mah, Adeline Huizhen ^[2]; Ledford, William K. ^[3]; Patterson, Steven ^[4]; Bergman, James A. ^[4]; ^[5]; Pickel, Deanna L. ^[6]; Messman, Jamie M. ^[4]; ^[7]; ^[8]

Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry
Univ. of Houston, TX (United States). Dept. of Materials Science and Engineering
Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996, United States
Honeywell Federal Manufacturing and Technologies, LLC, Kansas City, MO (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)
Oak Ridge High School, Oak Ridge, TN (United States)
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemical and Biomolecular Engineering
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Chemistry and Dept. of Chemical and Biomolecular Engineering

Decorating nanoparticle surfaces with end-tethered chains provides a way to mediate interfacial interactions in polymer nanocomposites. Here, polymer-grafted nanoparticles are investigated for their impact on the performance of polymer structures created by fused filament fabrication (FFF). The nanoscale organization of poly(methyl methacrylate)-grafted nanoparticles (PMMA-g-NPs) in PMMA matrices is examined via small-angle X-ray scattering (SAXS). SAXS data indicate that all nanocomposites exhibit particle–particle interactions, indicating that nanoparticles are locally clustered. Additionally, increasing the loading level of PMMA-g-NPs produces modest changes in T_g but significant increases in the complex viscosity and storage modulus, suggesting that the number density of entanglements between graft chains and the matrix polymer increases with increasing PMMA-g-NP content. Increasing the number density of entanglements and the formation of localized clusters manifest at the macroscale: Dynamic mechanical analysis and tensile testing show that FFF-printed PMMA-g-NPs/PMMA nanocomposites display a 65% increase in the Young’s modulus, 116% increase in the ultimate tensile strength, and a 120% increase in the storage modulus compared to parts printed with pure (unfilled) PMMA. This research effort highlights how interfacial engineering can be used to enhance interactions on the nanoscale and improve the macroscopic properties of parts printed by FFF.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; NA0002839

OSTI ID:: 1659566

Alternate ID(s):: OSTI ID: 1635025

Journal Information:: ACS Applied Polymer Materials, Journal Name: ACS Applied Polymer Materials Journal Issue: 3 Vol. 2; ISSN 2637-6105

Publisher:: ACS PublicationsCopyright Statement

Country of Publication:: United States

Language:: English

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small-angle X-ray scattering
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Tailoring Interfacial Interactions via Polymer-Grafted Nanoparticles Improves Performance of Parts Created by 3D Printing

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