tailieunhanh - Cellulose nanocrystals: synthesis, characteristics and effect on hydroxypropyl methylcellulose based composite films and coatings

This study aimed to synthesize, determine characteristics of cellulose nanocrystals such as morphology, size particle, zeta potential, Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). The study also evaluated effect of concentration of added cellulose nanocrystals to hydroxypropyl methylcellulose-base films and coatings containing carnauba Nano emulsion and chitosan nanoparticles. | Journal of Sience and Technology 54 (4A) (2016) 105-114 CELLULOSE NANOCRYSTALS: SYNTHESIS, CHARACTERISTICS AND EFFECT ON HYDROXYPROPYL METHYLCELLULOSE-BASED COMPOSITE FILMS AND COATINGS Nguyen Thi Minh Nguyet*, Nguyen Duy Lam, Pham Anh Tuan Vietnam Institute of Agricultural Engineering and Postharvest Technology, 60 Trung Kinh, Trung Hoa, Cau Giay, Ha Noi * Email: Received: 15 August 2016; Accepted for publication: 5 October 2016 ABSTRACT This study aimed to synthesize, determine characteristics of cellulose nanocrystals such as morphology, size particle, zeta potential, Fourier transform infrared spectroscopy (FT-IR) and transmission electron microscopy (TEM). The study also evaluated effect of concentration of added cellulose nanocrystals to hydroxypropyl methylcellulose-base films and coatings containing carnauba Nano emulsion and chitosan nanoparticles. Results showed the shape and size of the nanoparticle generally depend on hydrolysis condition of microcrystalline cellulose. Cellulose nanocrystals obtained from processing hydrolyzed microcrystalline cellulose in range from 47 wt. % to 55 wt. % had length range of from 160 to 196 nm and diameter from 9 to 11 nm. Cellulose nanocrystals were added into nanocomposite HPMC that incorporated with both of carnauba Nano emulsion and chitosan nanoparticles with concentration of cellulose nanocrystals at levels: , , and %. Scanning electron microscopy (SEM) images revealed that nanocomposite films become more compact and dense due to the cellulose nanocrystals occupy empty spaces of porous of matrix nanocomposite HPMC increasing the collapse of the pores in the films. The concentration of cellulose nanocrystals at % was added to Nanocomposite HPMC including both of carnauba nano emulsion and chitosan nanoparticles improved the physical strength of film with the best quality compared with other films as: film solubility was raised up %, film drying time is faster .