Properties and interactions of poly(vinyl alcohol)-sago pith waste biocomposites

Abstract

In this study, blending of poly (vinyl alcohol) (PVA) and sago pith waste (SPW) was prepared by a one-step melt extrusion. The physico-mechanical, Fourier transform-infrared (FT-IR), moisture sorption, rheological, and thermal characterization were conducted. Incorporation of PVA in SPW improved the tensile modulus, whereas the tensile strength reduced. The FT-IR analysis has shown that SPW could be introduced into the PVA network via the formation of hydrogen bonds between the PVA and SPW clusters. The interaction between PVA and SPW macromolecules has shown that there is a noticeable improvement in the water sorption ability. The rheological properties revealed that the PVA/SPW composites exhibited shear-thinning behavior and the blend viscosities increased with the rise in SPW content because of its rigid structure. Thermal analysis revealed that >50 wt% of PVA could induce greater molecular interaction between the PVA and SPW.

Observation of Potential Contaminants in Processed Biomass Using Fourier Transform Infrared Spectroscopy

“…The addition of toluene on poplar caused three bands including 3069 cm −1 for C-H stretching, 1497 cm −1 for C-C stretching, and 728 cm −1 for C-H out of plane bending [41]. Glycerol on poplar had the bands for O-H stretching at 3341 cm −1 , C-H stretching at 2948 and 2897 cm −1 , C-H deformation of secondary alcohol at 1333 and 1239 cm −1 , C-O stretching of primary alcohol at 1034 cm −1 , and O-H bending at 923 cm −1 [42,43]. Chloroform contaminants also showed at 1220 and 755 cm −1 for C-H bending and CCl 3 stretching [34].…”

“…FTIR band assignments of common biomass processing solvents on poplar[32][33][34][35][36][37][38][39][40][41][42][43][44][45]. Cont.…”

Preparation and Characterization of Polyvinyl Alcohol/Starch Blend Film Composite

“…From the results obtained, it can be observed that the pure PVA films demonstrated lower percentage of water absorption than the PVA/starch films. This is due to the fact that PVA and starch is highly hydrophilic polymer in nature caused by the presence of many hydroxyl groups in it and thus capable of forming hydrogen bonds in water [10]. Water absorption occurs almost entirely in the amorphous region of a polymeric system [11].…”