Molecular Motion in Viscous DGEBA with Nanoparticles as Seen by Quasi‐Elastic Neutron Scattering. Issue 1 (8th November 2018)

• Record Type: Journal Article
• Authors: Weidner, Maren Christin; Evenson, Zach; Zamponi, Michaela; Possart, Wulff
• Other Names: Froimowicz Pablo guestEditor.; Zhang Kan guestEditor.; Ran Qichao guestEditor.
• Is Part Of: Macromolecular chemistry and physics. Volume 220:Issue 1(2019)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-11-08
• Subjects: epoxy -- interphases -- nanoparticles -- quasi‐elastic neutron scattering -- self‐diffusion; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201800275
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: Pure and filled epoxies are widely used in industry. Nanocomposites especially are affected by interphase regions where properties deviate from bulk. The study of molecular mobility in epoxy monomers is a first step to understanding the molecular dynamics in nanocomposites and their effect on crosslinking in epoxy networks. Here, quasi‐elastic neutron scattering is used to disentangle the molecular motions of monomeric diglycidylether of Bisphenol A (DGEBA) and a suspension of zeolite nanoparticles in DGEBA on a timescale from 2 ps to 5.5 ns. Regarding molecular transport of DGEBA inside the suspension, the particles have no impact on the faster rotational motions. A combination of neutron time‐of‐flight and backscattering spectroscopy reveals a pronounced hindrance of DGEBA molecular dynamics on/in the zeolite particles along with a new type of molecular motion occurring on intermediate timescales. That localized motion is attributed to jump diffusion motions, emanating from interphase effects at the zeolite particles. Abstract : Quasi‐elastic neutron scattering is used to compare the molecular dynamics of neat and filled (with 10 wt% nanozeolites) epoxy resin diglycidylether of Bisphenol A (DGEBA). A significant hindrance of DGEBA molecular dynamics in the zeolite pores/on the particle surface along with a new type of molecular motion is revealed.