Blends of thermoplastic starch (TPS

Blends of thermoplastic starch (TPS) and poly(lactic acid) (PLA) (70/30 TPS/PLA wt/wt)
were thermopressed to produce biodegradable sheets. These sheets were coated with
cross-linked chitosan by two different methods: spraying and immersion. The coated
sheets presented a more irregular surface than uncoated samples, which was associated
with the chitosan reticulation. The chitosan coating reduced the water solubility and the
water vapor permeability of the sheets due to being less hygroscopic. Coated sheets were
more rigid and had higher tensile strength than uncoated sheets, because the cross-linking
joins the macromolecules covalently, reducing the mobility of the chains. Higher glycerol
concentration in the TPS increased the elongation at break due to the glycerol plasticizing
effect. Coating by spraying was more effective at changing the sheet properties than
coating by immersion, and this technique can be used to reduce the hydrophilic character
of biodegradable
fi
lms, allowing their use as packaging materials.

ผลลัพธ์ (อังกฤษ) 2:

Blends of Thermoplastic starch (TPS) and Poly (lactic acid) (PLA) (70/30 TPS / PLA WT / WT)
were Thermopressed to Produce biodegradable Sheets. Sheets were coated with these
cross-linked Chitosan by Two different methods: Immersion and spraying. The coated
Sheets Presented a more irregular surface than uncoated samples, which was associated
with the Chitosan reticulation. Chitosan Coating the Water solubility and the reduced the
permeability of the Water Vapor Sheets Due to being less hygroscopic. Sheets were coated
more rigid and had higher tensile strength than uncoated Sheets, because the cross-Linking
joins the macromolecules covalently, reducing the Mobility of the chains. Higher glycerol
concentration in the TPS Increased the elongation at Break Due to the glycerol plasticizing
Effect. Coating by spraying was more effective at changing the properties than Sheet
Coating by Immersion, and this used to be Technique Can Reduce the hydrophilic Character
of biodegradable
fi
LMS, allowing their use as packaging Materials.