Microstructure and Molecular Interaction in Glycerol Plasticized Chitosan/Poly(vinyl alcohol) Blending Films

Abstract

Exploring some basic interactions in blending systems is of great significance for designing a blend with controlled structure and properties. This work attempts to analyze microstructure and molecular interaction in glycerol plasticized chitosan/poly(vinyl alcohol) blends by atomic force microscopy, differential scanning calorimetry and ATR‐FTIR spectroscopy. Our results show that the blending films are aggregated by spherical chitosan/poly(vinyl alcohol) blending nanoparticles. The size and aggregation behavior of these particles are closely related to glycerol content. The presence of glycerol gives rise to a continuous closing in Tg of poly(vinyl alcohol) and chitosan components, suggesting an improved miscibility of the blend. Strong hydrogen bonding interaction in the blend is observed and further distinguished by peak resolution. Moreover, more interesting evidence on the effect of glycerol in the blends is provided by monitoring the structure evolution of the blend at different blending steps using atomic force microscopy. The formation of strong hydrogen bonding network among glycerol molecules and polymer matrix was considered as the main driving force to result in the changes in the microstructure and miscibility of the blend.magnified image

Physicochemical, Microstructural, and Antibacterial Properties of β‐Chitosan and Kudzu Starch Composite Films

“…The blue‐shifting hydrogen bond may be caused by electron density redistribution, rehybridization and structural reorganization, resulted in the contraction of the X–H bond (Joseph and Jemmis 2007). Liang and others (2009) found similar blue‐shifting phenomena in chitosan/poly(vinyl alcohol) blending films. For carbonyl bands of lactic acid, the blue shift became more obvious along with more starch added.…”

Characteristics of Mixed Polyvinyl Alcohol and Chitosan Obtained from Shrimp Shells and Squid Pens for Electromagnetic Wave Absorber

“…For the as-received materials, the intensities are much lower compared to those of the composite films. The increase of the band intensities in the composite films is expected to be due to the introduction of additional group into the composite blends, which is in agreement with the results found by others [23], [24].…”

“…As a comparison, the characteristic of pure PVA, pure -and β-chitosan are also given. As seen in the figure, the spectrum shows the appearance of hydrogen bonded OH and NH 2 stretching bands ranging from 3070 to 3450 cm-1 and bands at around 2871 to 2920 represent C-H groups stretching [23]. The amino groups show a band around 1584 cm-1, bands at 1375 and 1420 are attributed to the presence of methylene and methyl groups of chitosan respectively, whereas the asymmetrical vibration of CO shows a band at 1150 cm-1 [21].…”

Hierarchical Structure and Physicochemical Properties of Plasticized Chitosan

“…The M w of the chitosan used in our study (210 kg/mol) is much larger than the one used by Liang et al (44 kg/mol). 28 This implies the possibility of longer chitosan nanofibrils in our samples. Moreover, chitosan nanofibrils can be crystalline nuclei for each others to form nanofibril clusters.…”