Journal
CARBOHYDRATE POLYMERS
Volume 182, Issue -, Pages 123-131Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2017.11.021
Keywords
Thermoplastic starch; Nanocomposite; Montmorillonite; Time-domain NMR
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Funding
- CNPq (Brazil)
- Capes (Brazil) [PGCI 031-2012]
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The effects of granule disruption, the addition of glycerol and montmorillonite on the granule structure of corn starch were investigated by proton NMR relaxation, through the T-2*, T-1 and T-1. relaxation times. Films containing 0%, 1%, 5% and 7% (w/w) of clay were prepared by solution casting and the relaxometry data were compared with those gleaned from WAXD, TGA and SEM techniques. Starch gelatinization without glycerol or clay results in an amorphous and rigid film having a dipole coupling higher than that observed for the granule. The plasticization reduces the chains rigid fraction by more than 20% and increases the adsorption of moisture in the region of greater molecular mobility. The addition of 1% of clay reduces the adsorption of moisture and, in concentrations of 5% and 7%, the agglomerates reduce the plasticization effect. These features studied were observed by the Tube-Reptation and Renormalized Rouse models applied at low frequencies.
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