Flexible starch-polyurethane films: Effect of mixed macrodiol polyurethane ionomers on physicochemical characteristics and hydrophobicity

Tai, N.L.; Adhikari, Raju; Shanks, Robert A.; Halley, P. J.; Adhikari, Benu

doi:10.1016/j.carbpol.2018.06.019

Cited by 31 publications

(14 citation statements)

References 61 publications

(82 reference statements)

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“…Tai et al. observed two transition peaks in starch films plasticized with glycerol and associated them with the relaxations corresponding to the phase rich in glycerol and the phase rich in starch, which indicate partial miscibility of the two components …”

Section: Resultsmentioning

confidence: 94%

“…The important peak observed in Figure , in the range of −58 and −63 °C, is associated to the glycerol‐rich phase main relaxation whereas a wide and low‐intensity peak was observed between 10 and 26 °C attributed to the starch‐rich phase glass transition. Both relaxation peaks shifted to lower temperatures when the extracts were incorporated and the relaxation of the starch‐rich phase also widened.…”

Section: Resultsmentioning

confidence: 94%

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Influence of Green Tea and Basil Extracts on Cassava Starch Based Films as Assessed by Thermal Degradation, Crystalline Structure, and Mechanical Properties

2020

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Natural extracts are investigated as plasticizers of starch–glycerol biobased films for food coating applications. For this purpose, films with cassava starch, glycerol, and distilled water with and without green tea or basil extracts are obtained by solvent casting. The plasticizing effect of the extracts is confirmed from the films crystalline structure, thermal degradation behavior, glass transition temperature, and tensile properties. Increased mobility of starch chains is the result of a strong interaction between extract components and starch molecules. The Kohlrausch–Williams–Watts (KWW) theoretical modeling, used for the first time to determine the effect of antioxidant components in starch films, also confirms the plasticizing effect of either green tea or basil extracts. In addition, the original luminosity of the starch film is not compromised by the incorporation of the extracts. Moreover, a delay in the starch retrogradation is achieved, making the film more durable and hence, very promising to be used as food coating.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 94%

Influence of Green Tea and Basil Extracts on Cassava Starch Based Films as Assessed by Thermal Degradation, Crystalline Structure, and Mechanical Properties

2020

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“…From the DMA results, PS peak showed a decrease in intensity and increase in its width when the Na ionomer content increased. This depression in peak height can be attributed to the decrease in the mobility of the polymer chains in the vicinity of the glass transition and increased adhesion among the polymer chains . It is important to note here that only a single endothermic peak (resulting from the T g ) was observed for PSL composites.…”

Section: Resultsmentioning

confidence: 87%

“…Generally, for immiscible blends, the tan δ versus temperature curves show different peaks corresponding to the T g of the composites. A miscible composite shows only a single peak between the transition of the component and their individual transition temperature . The T g of the prepared composites increased from 61.8 to 66.5 °C with the addition of lignin.…”

Section: Resultsmentioning

confidence: 98%

Flexible and compatible polymer composite blends based on polyurethane/sodium ionomer/lignin and their properties

Rukmanikrishnan

Kim

Lee

2020

J of Applied Polymer Sci

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Polyurethane, sodium ionomer (Surlyn 8150), and lignin (PSL)-based composite films were prepared by the solution casting method with different weight percentages of lignin. The relationships among the morphology, thermal resistance, mechanical, and dynamic mechanical properties for all composites were characterized. The structural interactions, microstructure, and optical properties of the composite were studied by Fourier transform infrared, scanning electron microscopy (SEM), X-ray diffraction, and ultraviolet (UV) spectroscopy. The mechanical and UV absorbance properties of the composite films improved significantly with the addition of lignin particles. The tensile strength increased from 42.5 to 57.2 MPa. Dynamic mechanical analysis results show that the storage modulus of the composites increased and exhibited a single T g . PSL composite films show excellent water barrier properties, with improved surface hydrophobicity. SEM images revealed that a relatively uniform phase morphology and good interfacial compatibilization wereachieved. These results suggest that all of the composite films with PU, Na ionomers, and lignin materials exhibited good compatibility and miscibility.

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“…Lower angles indicate enhanced wettability. The surface is considered hydrophobic when contact angles are over 90° [16]. In Figure 3B, we can observe a decrease in the contact angle with an increase in the PEG content.…”

Section: Hydrophilicity and Hydrolytic Degradationmentioning

confidence: 93%

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes Properties

Morales-González¹,

Barrera²,

Valero³

2018

Preprint

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Polyurethanes are materials with a strong structure-property relationship. The goal of this research was to study the effect of a polyol blend composition of polyurethanes on its properties using a mixture design and setting mathematic models for each property. Water absorption, hydrolytic degradation, contact angle, tensile stretch, hardness and modulus were studied. Additionally, Thermal stability was studied by thermogravimetric analysis. Area under the curve was used to evaluate the effect of polyol blend composition on thermal stability and kinetics of water absorption and hydrolytic degradation. Least squares were used to calculate the regression coefficients. Models for the properties were significant, and lack of fit was not (P<0.05). Fit statistics suggest both good fitting and prediction. Water absorption, hydrolytic degradation and contact angle were mediated by the hydrophilic nature of the polyols. Tensile strength, modulus and hardness could be regulated by the molecular weight and hydroxyl index of the polyols. Regression of DTG curves from thermal analysis showed improvement of thermal stability with the increase of PCL and PE. An ANOVA test of the model terms demonstrated that three component effects on bulk properties like water absorption, hydrolytic degradation, hardness, tensile strength and modulus, and the PEG*PCL interaction with the contact angle, which is a surface property. Mixture design application allowed for an understanding of the structure-property relationship through mathematic models.     

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Flexible starch-polyurethane films: Effect of mixed macrodiol polyurethane ionomers on physicochemical characteristics and hydrophobicity

Cited by 31 publications

References 61 publications

Influence of Green Tea and Basil Extracts on Cassava Starch Based Films as Assessed by Thermal Degradation, Crystalline Structure, and Mechanical Properties

Influence of Green Tea and Basil Extracts on Cassava Starch Based Films as Assessed by Thermal Degradation, Crystalline Structure, and Mechanical Properties

Flexible and compatible polymer composite blends based on polyurethane/sodium ionomer/lignin and their properties

Surface Response Methodology-Based Mixture Design to Study the Influence of Polyol Blend Composition on Polyurethanes Properties

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