Thermal, Mechanical and Microstructures Properties of Cellulose Derivatives Films: A Comparative Study

Abstract

The proposal in this study was to evaluate the physical properties of different biopolymers films. The materials used were: pectin, carboxyl methylcellulose, methylcellulose, hydroxyl propylcellulose, hydroxypropylmethylcellulose, and corn waxy starch; from these polysaccharides aqueous dispersions were prepared to 3% (w/v) for obtained films. In these biopolymer films, the thermal diffusivities (α) was evaluated by the Open Photoacoustic Cell method; also, their mechanical properties as tensile strength, elongation, and Young's modulus were measured, their crystallinity percentage was evaluated by X-ray diffraction and microstructure through atomic force microscopy in contact mode. From the polysaccharide films, it was observed that most of them were flexible and transparent. In the case of the films, mechanical properties were found that the highest value of tensile strength and Young's modulus corresponded to carboxyl methylcellulose with 69.17 and 1,912.20 MPa values, respectively. Also, Open Photoacoustic Cell method and X-ray diffraction measurements showed that there exist a correlation between the thermal diffusivity values and the crystallinity measured in the biopolymer films. It was also observed that α values of cellulose derived was affected by the substitution group in the molecule, reaching the highest α value, the films of carboxyl methylcellulose. Regarding the microstructural of the films, starch showed the highest roughness value (88.6 nm) whereas hydroxypropyl-methylcellulose resulted with the lowest roughness value (7.67 nm).

Recent advances on the development of wound dressings for diabetic foot ulcer treatment—A review

“…Cellulose ester derivatives, such as cellulose acetate, cellulose triacetate and cellulose sulfate, are also fiber-and film-forming materials [145]. Moreover, their molecular weights can be varied, and therefore their aqueous viscosities and gelation properties can be tuned [143,146]. These features allow their use in several pharmaceutical formulations and for various biomedical purposes.…”

Sustainable alginate/aloe vera composite biodegradable films reinforced with carboxymethyl cellulose and hydroxypropyl methylcellulose

“…Moreover, improved physicochemical and mechanical properties of edible films by incorporating both CMC and HPMC have been reported in various studies. [26][27][28][29] Therefore, the present study was designed to investigate the role of CMC and HPMC on the physiochemical properties of the alginate/aloe vera composite films particularly as reinforcing materials for improving the mechanical properties of these films.…”

Effect of Molecular Weight and Degree of Substitution on the Physical-Chemical Properties of Methylcellulose-Starch Nanocrystal Nanocomposite Films

“…This substitution pattern endows MC with excellent thermal gelation and film-forming characteristics compared with cellulose [4]. Up to now, it has been demonstrated that molecular weight (M w ) and degree of substitution (DS) of MC play critical roles in its physicochemical properties, i.e., water solubility, thermal stability, thickening, and gel-and film-forming properties [5]. Commercial MC is usually produced with an average DS value ranging from 1.4 to 1.9 mol Polymers 2021, 13, 3291 2 of 13 of OCH 3 per mol of AGU unit, which can readily dissolve in water at low temperatures to form homogeneous film-forming solutions [6].…”