期刊
EXPRESS POLYMER LETTERS
卷 8, 期 12, 页码 941-952出版社
BUDAPEST UNIV TECHNOL & ECON
DOI: 10.3144/expresspolymlett.2014.95
关键词
mechanical properties; poly(vinyl alcohol); cyclodextrin; crosslinking; cast films
In this paper, we propose a green route to prepare insoluble poly(vinyl alcohol) (PVOH) cast films with potential application as antimicrobial packaging. First PVOH films were cast from different aqueous solutions and analyzed by Differential Scanning Calorimetry (DSC) and Dynamic Mechanical Analysis (DMA) to determine their physical properties under two storage conditions. In order to obtain insoluble films, PVOH was then crosslinked by citric acid (CTR) as confirmed by Nuclear Magnetic Resonance (NMR) analyses. The crosslinking reaction parameters (curing time, crosslinker content) were studied by comparing the characteristics of PVOH/CTR films, such as free COOH content and glass transition temperature (T-g) value, as well as the impact of the crosslinking reaction on mechanical properties. It was found that for 40 and 10 wt% CTR contents, 120 and 40 min of crosslinking times were necessary to bind all CTR respectively. Brittle films were obtained for 40 wt% CTR whereas 10 wt% CTR content led to ductile films. Finally, films containing hydroxypropyl-beta-cyclodextrin (HP beta CD), chosen as a potential vector of antimicrobial agent, were prepared. The obtained results show that the incorporation of HP beta CD in the PVOH matrix does not mainly influence the physical and mechanical properties of the films.
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