Preparation, Characterization and Properties of Films Obtained from Cross-linked Guar Gum

Rodrigo S Banegas,Adriana De M G Borges,Valdir Soldi,Clarice F Zornio,Ledilege C Porto

doi:10.4322/polimeros.2013.082

Rodrigo S Banegas, Adriana De M G Borges + Show 3 more

Open Access

https://doi.org/10.4322/polimeros.2013.082

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Abstract

In this study the viability of using guar gum to form films was investigated along with the effectiveness of the cross-linking process employing 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide hydrochloride (EDC) as the cross-linking agent. In addition, the cross-linked films were evaluated considering the water absorption, thermal stability and mechanical properties. The cross-linking process of guar gum films was confirmed by the low solubility in water and through infrared analysis. The results shown that the properties evaluated were affected by the cross-linking process due to changes in the polysaccharide structure. For example, the swelling behavior and water vapor absorption decreased with an increase in the amount of EDC. The EDC content (10-30%) also affected the polymer structure and hydrogen bond formation, reducing the thermal stability of the system.

Highlights

É to relate their microstructure to these properties[1,2,3]
The uncross-linked films of Guar gum (GG) were totally soluble in water, while after the cross-linking process the films were almost insoluble and maintained their integrity after immersion in water
The average solubility of the crosslinked films was ca. 26%, indicating that the cross-linking process was efficient, which is in agreement with the results for the water vapor absorption and swelling behavior discussed below

Summary

Introduction

É to relate their microstructure to these properties[1,2,3] Natural structure, since it is released forming a urea derivative which can. C polymers, such as polysaccharides, have become increasingly be removed by washing with water. Characteristics such as the important because of their low cost, high availability, low toxicity low toxicity and the simple removal of the sub-products (urea) are. Liang et al.[23] studied hydrogels of gelatin cross-linked with EDC and genipin of mannose to galactose units (M/G) varies from 1.5:1 to lattices.

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