Journal
CARBOHYDRATE POLYMERS
Volume 134, Issue -, Pages 205-212Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2015.08.007
Keywords
Thermoplastic corn-starch; Poly(epsilon-caprolactone); Thermal processing; Structural and final properties
Categories
Funding
- Consejo Nacional de Investigaciones Cientificas y Tecnicas (CONICET, Argentina) [PIP0428]
- Universidad Nacional del Sur (UNS, Argentina) [PGI 24/M135]
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Final properties of two thermoplastic corn starch matrices were improved by adding poly(epsilon-caprolactone), PCL, at 2.5, 5, and 10% w/w. One of the thermoplastic starch matrices was processed using water and glycerol as plasticizers (S-G) and the other one was plasticized with a mixture of glycerol and sodium alginate (SG,). Blends were suitably processed by melt mixing and further injected. Films obtained by thermo-compression were flexible and easy to handle. Microstructure studies (SEM and FTIR) revealed a nice distribution of PCL within both matrices and also a good starch-PCL compatibility, attributed to the lower polyester concentration. The crystalline character of PCL was the responsible of the increment in the degree of crystallinity of starch matrices, determined by XRD. Moreover, it was demonstrated by TGA that PCL incorporation did not affect the thermal stability of these starch-based materials. In addition, a shift of T-g values of both glycerol and starch-rich phases to lower values was determined by DSC and DMA tests, attributed to the PCL plasticizing action. Besides, PCL blocking effect to visible and UV radiations was evident by the incremented opacity and the UV-barrier capacity of the starch films. Finally, water vapor permeability and water solubility values were reduced by PCL incorporation. (C) 2015 Elsevier Ltd. All rights reserved.
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