Synthesis and characterization of methylcellulose from cellulose extracted from mango seeds for use as a mortar additive

Abstract

Methylcellulose was produced from the fibers of Mangifera indica L. Ubá mango seeds. MCD and MCI methylcellulose samples were made by heterogeneous methylation, using dimethyl sulfate and iodomethane as alkylating agents, respectively. The materials produced were characterized for their thermal properties (DSC and TGA), crystallinity (XRD) and Degree of Substitution (DS) in the chemical route. The cellulose derivatives were employed as mortar additive in order to improve mortar workability and adhesion to the substrate. These properties were evaluated by means of the consistency index (CI) and bond tensile strength (TS) tests. The methylcellulose (MCD and MCI) samples had CI increased by 27.75 and 71.54% and TS increased by 23.33 and 29.78%, respectively, in comparison to the reference sample. Therefore, the polymers can be used to produce adhesive mortars.

Evaluation of Structural Properties of Cellulose Ether-Corn Starch Based Biodegradable Films

“…Similar results for carboxymethylcellulose powders have been reported in the literature [31,32]. Furthermore, the maximum around 20º appeared in all polymers and was assigned to the polymeric chain packing due to the van der Waals forces and called as van der Waals halo [33]. Corn starch powder showed the A-type crystalline structure [34].…”

“…Relative degree of crystallinity data of methylcellulose, carboxymethylcellulose and starch powder have been calculated as 40.8 ± 0.3%, 25.4 ± 2.1%, and 26.9 ± 2.2%, respectively. Crystallinity value for methylcellulose has been reported in the literature between 30.4% and 52.6% depending on the degree of substitution and synthesizing method [33,39]. Similarly, for carboxymethylcellulose it has been reported between 18.4% and 63.0% depending on both degree of substitution and synthesizing method [31,40,41].…”

Methylcellulose, a Cellulose Derivative with Original Physical Properties and Extended Applications

“…MC finds a major application as a performance additive in construction materials [100]. It is added to mortar dry mixes to improve the mortar properties such as workability, open and adjustment time, water retention, viscosity, and adhesion to surfaces [101].…”

Poly(lactic acid) biocomposites with mango waste and organo‐montmorillonite for packaging

“…The PLA sample loaded with mango tegument presented a higher T g , T c , and T m than the PLA sample, and its degree of crystallinity was similar. The T g change could be related to water loss by the cellulose and hemicellulose fibers, which occurs at temperatures higher than 70 °C . Samples of PLA–cellulose nanocrystals showed that the presence of an adequate amount of cellulose can act as a nucleating agent for PLA crystallization, enhancing the degree of crystallization of the samples.…”