Effect of sodium benzoate and chlorhexidine gluconate on a bio-thermoplastic elastomer made from thermoplastic starch-chitosan blended with epoxidized natural rubber. (15th August 2020)

• Record Type: Journal Article
• Authors: Kodsangma, Araya; Homsaard, Nattagarn; Nadon, Sudarut; Rachtanapun, Pornchai; Leksawasdi, Noppol; Phimolsiripol, Yuthana; Insomphun, Chayatip; Seesuriyachan, Phisit; Chaiyaso, Thanongsak; Jantrawut, Pensak; Inmutto, Nakarin; Ougizawa, Toshiaki; Jantanasakulwong, Kittisak
• Is Part Of: Carbohydrate polymers. Volume 242(2020)
• Publication Date: 2020-08-15
• Subjects: Thermoplastic starch -- Chitosan -- Epoxidized natural rubber -- Antimicrobial -- Biopolymer; Polysaccharides -- Periodicals; Polysaccharides -- Periodicals; Polysaccharides -- Périodiques; Electronic journals; 547.78
• DOI: 10.1016/j.carbpol.2020.116421
• Languages: English
• ISSNs: 0144-8617

Abstract

Highlights: Bio-thermoplastic elastomer (TPE) was developed by blending thermoplastic starch-chitosan (TPSC) with epoxidized natural rubber (ENR). Epoxy groups of ENR reacted with the amino groups of chitosan. Sodium benzoate and chlorhexidine gluconate reacted with ENR and improved mechanical, morphology, reaction, hardness and antimicrobial properties. Sodium benzoate blend showed antibacterial property while chlorhexidine gluconate blend presented both antibacterial and fungal properties Abstract: Thermoplastic elastomer (TPE) was developed by blending thermoplastic starch (TPS) with rubber. Thermoplastic starch-chitosan (TPSC) was prepared by the solution mixing of cassava starch, chitosan (CTS) and glycerol in acidified water (lactic acid 1 wt%) at 80 °C follow by melt mixing at 130 °C. Sodium benzoate (BEN) and chlorhexidine gluconate (Cl) were added during the solution mixing as additives for antimicrobial properties. TPSC was melt-mixed with epoxidized natural rubber (ENR) (70/30 wt/wt). The tensile strength and elongation at break of the TPSC/ENR increased with the additive content. Elastic recovery was improved by the addition of Cl. A new peak in the FTIR data confirmed the reaction between the reactive functional groups of the CTS and the additives with the epoxy groups of ENR. These reactions and miscibility of the TPSC/ENR/additives blends improved the mechanical properties, elasticity, morphology, and antimicrobial properties of the blends.