Characterization of carboxymethyl cellulose-based nanocomposite films reinforced with oxidized nanocellulose isolated using ammonium persulfate method

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>Cellulose nanocrystals (CNCs) were isolated from cotton linter (CL) and microcrystalline cellulose (MCC) using an ammonium persulfate (APS) method for a simultaneous isolation and oxidation of CNCs. The CNCs were in rod-like shape with a diameter of 10.3nm and 11.4nm, a length of 120–150nm and 103–337nm, a crystallinity index of 93.5% and 79.1% for the CNC<SUP>CL</SUP> and CNC<SUP>MCC</SUP>, respectively. The suspensions of oxidized CNCs were transparent and stable with the zeta potential values of −50.6mV and −46.9mV. The CNCs were uniformly distributed within the carboxymethyl cellulose (CMC) polymer matrix. The tensile strength (TS) increased by 102% and 73%, and elastic modulus (E) increased by 228% and 166% with the incorporation of at 10wt% of CNC<SUP>CL</SUP> and CNC<SUP>MCC</SUP>, respectively. Conclusively, the CNC<SUP>CL</SUP> showed a more uniform particle size distribution, higher crystallinity, transparency, thermal stability, and superior mechanical strength compared with the CNC<SUP>MCC</SUP>.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Oxidized cellulose nanocrystals (CNCs) were prepared using ammonium persulfate method. </LI> <LI> Cotton linter (CL) and microcrystalline cellulose (MCC) were used as cellulose sources. </LI> <LI> The CNCs were used as reinforcing filler for preparation of CMC-based nanocomposite films. </LI> <LI> CNC<SUP>CL</SUP> exhibited higher crystallinity, mechanical strength, and transparency than CNC<SUP>MCC</SUP>. </LI> </UL> </P>