Title
Chemical and nanomechanical analysis of rice husk modified by ATRP-grafted oligomer
Document Type
Article
Publication Date
8-15-2011
Abstract
Rice husk (RH), an abundant agricultural residue, was reacted with 2-bromoisobutyryl bromide, to convert it to a heterogeneous polyfunctional macroinitiator for Atom Transfer Radical Polymerization (ATRP). The number of active sites placed on the RH surface was small, but they were ATRP active. Non-polar methyl methacrylate (MMA) and polar acrylonitrile (AN) were polymerized from the RH, and a sequential monomer addition was used to prepare an amphiphilic PMMA-b-PAN copolymer on RH surface. FTIR qualitatively confirmed the grafting. Gravimetric and XPS analysis of the different RH surface compositions indicated thin layers of oligomeric PMMA, PAN, and PMMA-b-PAN. The modified surfaces were mapped by nanomechanical AFM to measure surface roughness, and adhesion and moduli using the Derjaguin-Muller-Toropov model. RH grafted with MMA possessed a roughness value of 7.92, and a hard and weakly adhering surface (13.1. GPa and 16.7. nN respectively) while RH grafted with AN yielded a roughness value of 29 with hardness and adhesion values of 4.0. GPa and 23.5. nN. The PMMA-b-PAN modification afforded a surface with a roughness value of 51.5. nm, with hardness and adhesion values of 3.0. GPa and 75.3. nN. © 2011 Elsevier Inc.
Publication Title
Journal of Colloid and Interface Science
Recommended Citation
Morsi, S.,
Pakzad, A.,
Amin, A.,
Yassar, R.,
&
Heiden, P.
(2011).
Chemical and nanomechanical analysis of rice husk modified by ATRP-grafted oligomer.
Journal of Colloid and Interface Science,
360(2), 377-385.
http://doi.org/10.1016/j.jcis.2011.04.065
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/6633