Determination of structural and mechanical properties, diffractometry, and thermal analysis of chitosan and hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol

Food Science and Technology (Campinas)

Jefferson Rotta²  Edson Minatti¹  Pedro Luiz Manique Barreto² 

[1] ,Federal University of Santa Catarina Food Science and Technology Department Florianópolis SC ,Brazil

关键词: films;    chitosan;    hydroxypropylmethylcellulose;    physico-chemical properties;    filmes;    quitosana;    hidroxipropilmetilcelulose;    propriedades físico-químicas;   

DOI  :  10.1590/S0101-20612011000200026

来源: SciELO

【 摘 要 】

In this work, the structural, mechanical, diffractometric, and thermal parameters of chitosan-hydroxypropylmethylcellulose (HPMC) films plasticized with sorbitol were studied. Solutions of HPMC (2% w/v) in water and chitosan (2% w/v) in 2% acetic acid solution were prepared. The concentration of sorbitol used was 10% (w/w) to both polymers. This solutions were mixed at different proportions (100/0; 70/30; 50/50; 30/70, and 0/100) of chitosan and HPMC, respectively, and 20 mL was cast in Petri dishes for further analysis of dried films. The miscibility of polymers was assessed by X-ray diffraction, scanning electronic microscopy (SEM), differential scanning calorimetry (DSC), and thermal gravimetric analysis (TGA). The results obtained indicate that the films are not fully miscible at a dry state despite the weak hydrogen bonding between the polymer functional groups.

【 授权许可】

CC BY   
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