Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7889495 | Composites Part A: Applied Science and Manufacturing | 2018 | 43 Pages |
Abstract
Covalent organic frameworks (COFs) synthesized from condensation reaction between 1,3,5-triformylphloroglucinol (TFP) and p-phenylenediamine (PDA) have been exfoliated and modified simultaneously through ultrasound of COFs and sodium ligninsulfonate in deionized water for 10â¯h and then incorporated into chitosan. It is inferred from nano-size sheets in Transmission electron microscopy (TEM) image and S and Na element in energy dispersive spectrometer (EDS) that modified COFs (mCOFs) nanosheets have been prepared successfully. The Young's modulus, fracture strength, and yield strength of chitosan/mCOFs nanosheets-1.6â¯wt% nanocomposite film increases by 94.3%, 27.9%, and 21.2%, respectively. The peak heat release rate (PHRR) and total heat release (THR) of chitosan loaded with 1.6â¯wt% mCOFs nanosheets also decrease by 41.3% and 33.4%, respectively. The well-dispersed mCOFs nanosheets not only function physical barrier and mechanical enhancement effect, but also contribute to graphitization degree of char residues, resulting in enhanced thermal, flame retardancy and mechanical performances.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Xiaowei Mu, Jing Zhan, Xiaming Feng, Wei Cai, Lei Song, Yuan Hu,