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A Facile Microwave Assisted TEMPO/NaOCl/Oxone (KHSO 5 ) Mediated Micron Cellulose Oxidation Procedure: Preparation of Two Nano TEMPO‐Cellulose Forms
Author(s) -
Dachavaram Soma Shekar,
Moore John P.,
Bommagani Shobanbabu,
Penthala Narsimha R.,
Calahan Julie L.,
Delaney Sean P.,
Munson Eric J.,
BattaMpouma Joseph,
Kim JinWoo,
Hestekin Jamie A.,
Crooks Peter A.
Publication year - 2020
Publication title -
starch ‐ stärke
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.62
H-Index - 82
eISSN - 1521-379X
pISSN - 0038-9056
DOI - 10.1002/star.201900213
Subject(s) - cellulose , aqueous solution , transmission electron microscopy , chemical engineering , cellulose fiber , nanometre , materials science , scanning electron microscope , oxidized cellulose , zeta potential , nano , elemental analysis , fiber , chemistry , polymer chemistry , nuclear chemistry , nanoparticle , organic chemistry , nanotechnology , composite material , engineering
An efficient and rapid method is established for micron cellulose ( 1 , 20 microns) oxidation utilizing Oxone (KHSO 5 ) in combination with 2,2,6,6‐tetramethylpiperidinyl‐1‐oxyl (TEMPO) and NaOCl in aqueous NaHCO 3 solution (pH 7.5 to 8.5) under microwave irradiation. This method affords two different forms of nano TEMPO‐cellulose, that is, a water‐insoluble form (Form‐I, 14 nm) and a water‐soluble form (Form‐II, 8 nm). Cellulose oxidation utilizing this Oxone methodology has advantages over other methodologies, which include low cost and formation of two nano TEMPO‐cellulose forms over a rapid reaction time utilizing microwave irradiation conditions. TEMPO‐cellulose forms are characterized by FT‐IR, NMR, solid state 13 C‐NMR, and by elemental analysis. The TEMPO‐cellulose forms morphology is studied by scanning electron microscopy analysis. The average fiber width and length of TEMPO‐cellulose materials are determined in nanometer range by transmission electron microscopy analysis and the surface charge is identified by zeta potential.