Multiscale Polymer Dynamics in Hierarchical Carbon Nanotube Grafted Glass Fiber Reinforced Composites.

Clicks: 194
ID: 100038
2019
Article Quality & Performance Metrics
Overall Quality Improving Quality
0.0 /100
Combines engagement data with AI-assessed academic quality
AI Quality Assessment
Not analyzed
Abstract
Carbon nanotube (CNT) grafted glass fiber reinforced epoxy nanocomposites (GFRP) present a range of stiffnesses (MPa to GPa) and length scales (m to nm) at the fiber-matrix interface. The contribution of functionalized CNT networks to the local and bulk polymer dynamics is studied here by using a combination of torsion dynamical mechanical thermal analysis (DMTA), positron annihilation lifetime spectroscopy (PALS), and neutron scattering (NS) measurements. DMTA measurements highlight a reduction in the storage modulus (') in the rubbery region and an asymmetric broadening of the loss modulus (″) peak in the -transition region. NS measurements show a suppressed hydrogen mean-square displacement (MSD) in the presence of glass fibers but a higher hydrogen MSD after grafting functionalized CNTs onto fiber surfaces. PALS measurements show greater free volume characteristics in the presence of the functionalized CNT modified composites, supporting the view that these interface layers increase polymer mobility. While NS and DMTA are sensitive to different modes of chain dynamics, the localization of functionalized nanotubes at the fiber interface is found to affect the distribution of polymer relaxation modes without significantly altering the thermally activated relaxation processes.
Reference Key
krishnamurthy2019multiscaleacs Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Krishnamurthy, Ajay;Tao, Ran;Senses, Erkan;Doshi, Sagar M;Burni, Faraz Ahmed;Natarajan, Bharath;Hunston, Donald;Thostenson, Erik T;Faraone, Antonio;Forster, Amanda L;Forster, Aaron M;
Journal acs applied polymer materials
Year 2019
DOI
10.1021/acsapm.9b00464
URL
Keywords
viscoelastic properties neutron scattering carbon nanotube composites fiber reinforced polymer nanocomposites hierarchical composites polymer dynamics polymer nanocomposites positron annihilation lifetime spectroscopy

Citations

No citations found. To add a citation, contact the admin at info@scimatic.org

Comments

No comments yet. Be the first to comment on this article.