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. 2020 Oct 22;12(11):2447.
doi: 10.3390/polym12112447.

Hydrophilic Films Based on Carboxymethylated Derivatives of Starch and Cellulose

Katarzyna Wilpiszewska  1 , Adrian Krzysztof Antosik  1 , Beata Schmidt  1 , Jolanta Janik  1 , Joanna Rokicka  1
Affiliations

Hydrophilic Films Based on Carboxymethylated Derivatives of Starch and Cellulose

Katarzyna Wilpiszewska et al. Polymers (Basel). .

Abstract

The carboxymethylated derivatives of starch (CMS) and cellulose (CMC) were used for film preparation. The infrared spectroscopy revealed that crosslinking via ester bridges with citric acid occurred between the two polysaccharide derivatives. The effect of polysaccharide derivatives ratio on physicochemical properties of prepared films was evaluated. Generally, the values of tested parameters (moisture absorption, surface roughness, and mechanical and thermal properties) were between the values noted for neat CMS or CMC-based films. However, the physicochemical properties of the system with equal CMS/CMC weight ratio diverged from this trend, i.e., the highest tensile strength, the highest Young's modulus (ca. 3.4 MPa and ca. 4.9 MPa, respectively), with simultaneously the lowest moisture absorption (18.5% after 72 h) have been noted. Such systems could potentially find application in agriculture or pharmacy.

Keywords: carboxymethyl cellulose; carboxymethyl starch; hydrophilic films; polysaccharide films.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Fourier transform infrared (FTIR) spectra of neat carboxymethyl cellulose (CMC) (curve A), CMS/CMC based films for wt% ratio: 60/40 (B), 50/50 (C); and 40/60 (D), neat carboxymethyl starch (CMS) (E), and citric acid (F).
Figure 2
Figure 2
Scheme of CMS/CMC crosslinking reaction with citric acid (CA), for the sake of clarity the reaction for molar ratio equal 1.0 was presented.
Figure 3
Figure 3
Scheme of interaction between: (A) CMC-CMC and (B) CMS-CMS molecules.
Figure 4
Figure 4
Picture of CMS/CMC 50/50 film.
Figure 5
Figure 5
Laser scanning microscopy: (a) topographical images and (b) 3D images of CMS/CMC-based films.
Figure 5
Figure 5
Laser scanning microscopy: (a) topographical images and (b) 3D images of CMS/CMC-based films.
Figure 5
Figure 5
Laser scanning microscopy: (a) topographical images and (b) 3D images of CMS/CMC-based films.
Figure 6
Figure 6
Roughness parameters Rz and Ra determined for CMS/CMC-based films.
Figure 7
Figure 7
Moisture absorption of CMS/CMC films.
Figure 8
Figure 8
The dynamic mechanical thermal analyses (DMTA) curves of CMS/CMC films.
Figure 9
Figure 9
Typical true stress versus true strain curves of CMS/CMC films.
Figure 10
Figure 10
Tensile strength (A), Young’s modulus (B) and elongation at break (C) of CMS/CMC films.
See this image and copyright information in PMC

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