Characterisation of poly(vinyl alcohol) coating mixed with anthocyanin dye extracted from roselle flower with different nitrate salt

Abstract

Purpose -The purpose of this paper is to develop a new water-based coating system composed of poly(vinyl alcohol) and anthocyanin colourant extracted from Hibiscus sabdariffa L. and to characterise the system. Design/methodology/approach -Anthocyanin from Hibiscus sabdariffa L. (roselle) calyxes was extracted by using distilled water and filtered to remove insoluble particle. Salts introduced into the extract were 5wt percent calcium nitrate, 5wt percent magnesium nitrate, and 5wt percent zinc nitrate. The solution was mixed with poly(vinyl alcohol) in ratio of 3:1. The mixtures were coated on glass substrate and allowed to cure for approximately one day. Colour of the extract systems was determined by CIELab colourimetry. FTIR spectroscopy was conducted on the samples to identify their functional groups and changes upon addition of salt. Thermal stability was assessed by thermogravimetric analysis (TGA). Differential scanning calorimetry (DSC) was employed to measure the glass transition temperature Tg of the samples. XRD was employed to determine the amorphous properties of the coating samples. Findings -From FTIR spectroscopy, shifting in the OH stretching and CH2 bending bands was attributed to hydrogen bonds formation between PVA and nitrate salt. Shifting in the main decomposition step in samples with addition of nitrate salts in TGA was due to interaction of PVA and nitrate. Increase in glass transition temperature of samples with salts was attributed to the formation of hydrogen bonding. From XRD study, increase in the amorphous properties was due to the incorporation of nitrate salts into PVA coating. Research limitations/implications -Limitation of implementating poly(vinyl alcohol) as coating is caused by its weak water resistance and hydrophilic properties. This study could bring about research towards incorporation of different natural colourant with different binder materials to form coatings which are environmental-friendly and low cost. Practical implications -Mixture of PVA and anthocyanin colourant from roselle for use as coating has been developed. The coating can find usage in various applications such as coloured coating for furniture and wooden materials for decorative purposes, biodegradable design materials for interior purposes. It can be practically applied on a variety of substrates such as glass and wood. Originality/value -Development of water-based coating from PVA binder with anthocyanin colourant is introduced in this study.

Mechanical, UV protection, and antibacterial properties of poly(vinyl alcohol)/marine mucilage biocomposite films

“…This increment was due to the ionic crosslinking, which restricted the free motion of the PVA chains. Similar results were reported by Lee et al 52 for PVA and nitrate salt mixture. The melting points of 5M‐PVA and 10M‐PVA films were determined to be 188 and 181°C, respectively.…”

Preparation and Characterization of Geopolymers Based on Metakaolin with the Addition of Organic Phase PVA

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Spathodea campanulata bud fluid reinforced mechanical, hydrophilicity and degradation studies of poly (vinyl alcohol) matrix

“…The weak absorption peak observed at 1327 cm −1 is due to the C-OH bending vibration. The peak at 1732 cm −1 is due to the presence of carbonyl (C=O) stretching of the non-hydrolysed residual vinyl acetate group of PVA [32]. The FTIR spectra of PSC composite films revealed different features.…”