Improving Properties of Arrowroot Starch (Maranta arundinacea)/PVA Blend Films by Using Citric Acid as Cross-linking Agent

[摘要] This research studied the effect of PVA as organic polymer and citric acid as crosslinker agent in the arrowroot starch/PVA blend films. The properties of films were investigated by water uptake, water vapor permeability, mechanical properties, thermal stability, spectra of FTIR and XRD patterns. PVA used in this research influenced the film properties at the highest concentration. The cross-linkingsinter or intra molecules of arrowroot and PVA were developed as ester bonds which are formed from the reaction of hydroxyl groups consisting of starch and PVA with citric acid. The ester bond was confirmed by FTIR spectra. The increase of the amount of citric acid affected significantly on physical, chemical and mechanical properties, water uptake, WVP and crystallinity. Water barrier level was reduced by decreasing of water uptake and WVP succeeded significantly with increased crosslinking. Cross-linking impact the thermal stability of the films. The elasticity of the films also increases the production of citric acid as a plasticizer in the making of the films as a food packaging material.

[发布机构] Development Centre of Appropriate Technology, Indonesian Institute of Sciences, Jl. KS. Tubun No. 5, Subang West Java; 41213, Indonesia^1;Department of Chemistry, Faculty of Mathematics and Sciences, Universitas Gadjah Mada, Sekip Utara Bulaksumur Yogyakarta; 55281, Indonesia^2

[效力级别] 化学 [学科分类] 生物科学（综合）

[关键词] Arrowroot starch;Cross linking agents;Crystallinities;Film properties;Food-packaging materials;FT-IR spectrum;Hydroxyl groups;Water barriers