Bulletin of the American Physical Society
2023 APS March Meeting
Volume 68, Number 3
Las Vegas, Nevada (March 5-10)
Virtual (March 20-22); Time Zone: Pacific Time
Session N00: Poster Session II (11am-2pm PST)
11:00 AM,
Wednesday, March 8, 2023
Room: Exhibit Hall (Forum Ballroom)
Sponsoring
Unit:
APS
Abstract: N00.00015 : Elucidating the Roles of Grafting Density and Bonding Types on the Tethered Polymer Dynamics in Nanoparticle Organic Hybrid Material System
Presenter:
Javad Jeddi
(Ohio State University)
Author:
Javad Jeddi
(Ohio State University)
investigated by broadband dielectric spectroscopy (BDS), X-ray scattering (SAXS), and thermal analysis techniques (TGA and DSC). Grafting density and chemical bonding
(ionic and covalent) are controlled during the synthesis process to understand the effect of these parameters on the structure and molecular dynamics of NOHMs. Thermal
analysis showed that covalently bonded samples have higher thermal stability and glass transition temperature (Tg) than ionic counterparts. The Tg is enhanced by increasing
grafting density in both ionic and covalent NOHMs. With decreasing grafting density, the SAXS characteristic peak shift to higher q values revealing center-to-center interparticle distance reduction. Dielectric spectroscopy results revealed the slowing down of -relaxation time is controlled by grafting density and bonding so that higher relaxation time is obtained in the highly grafted sample with the covalent bond. Broadening the relaxation time distribution implied heterogeneous structural dynamics governed by grafting density and bonding type. These results demonstrate the role of grafting density and bonding types on the rational design of NOHMs for desired properties
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