Desiccant effect of starch in polylactic acid composites

Móczó, János; Kun, Dávid; Fekete, Erika

doi:10.3144/expresspolymlett.2018.88

Cited by 13 publications

(3 citation statements)

References 45 publications

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“…The water absorption of starch is attributed to the hygroscopic nature of the polysaccharide. This result is similar to those in [33][34][35][36][37].…”

Section: Water Absorptionsupporting

confidence: 89%

Plasticizer Enhancement on the Miscibility and Thermomechanical Properties of Polylactic Acid-Chitin-Starch Composites

et al. 2020

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In previous research, a polylactic chitin starch composite was prepared without the use of a solvent to enhance the miscibility. In this study, a polylactic acid (PLA) chitin starch composite was produced with chloroform as a plasticizer in the ratio 1:10. The blending of chitin and starch with PLA ranges from 2% to 8%. Tensile strength, impact, thermogravimetry analysis-Fourier-transform infrared spectroscopy (TGA)-FTIR, and differential scanning calorimetry (DSC) were used to test the thermomechanical properties. Also, the morphological properties, water absorption, and wear rate of the material was observed. The results showed that the tensile strength, yield strength, and impact strength were improved compared to the pure polylactic acid. Also, the elastic modulus of the samples increased, but were lower compared to that of the pure polylactic acid. The result of the fractured surface morphology showed good miscibility of the blending, which accounted for the good mechanical properties recorded in the study. The thermogravimetric analysis (TGA) and derivative thermogravimetric analysis DTA show a single degradation and peak respectively, which is also shown in the glass temperature measures from the DSC analysis. The water absorption test shows that the water absorption rate increases with starch content and the wear rate recorded sample A (92% P/8% C) as the highest. The high miscibility projected was achieved with no void, with the use of chloroform as a plasticizer.

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“…The water absorption of starch is attributed to the hygroscopic nature of the polysaccharide. This result is similar to those in [33][34][35][36][37].…”

Section: Water Absorptionsupporting

confidence: 89%

Plasticizer Enhancement on the Miscibility and Thermomechanical Properties of Polylactic Acid-Chitin-Starch Composites

et al. 2020

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“…The work of [17] on the extrusion of PLA–starch showed that the interdependence of starch and PLA increased with a decrease in starch percentage, especially when the ratio of starch to PLA is less than 1:10 and the water absorption was reduced. The reinforcing effect of starch is established in [20], where work on PLA–starch using glycerol as a plasticizer and a compression molding method were performed. The stiffness and strength of the composite were enhanced with the use of a plasticizer.…”

Section: Introductionmentioning

confidence: 99%

Properties and Characterization of a PLA–Chitin–Starch Biodegradable Polymer Composite

et al. 2019

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This paper presents a comparison on the effects of blending chitin and/or starch with poly(lactic acid) (PLA). Three sets of composites (PLA–chitin, PLA–starch and PLA–chitin–starch) with 92%, 94%, 96% and 98% PLA by weight were prepared. The percentage weight (wt.%) amount of the chitin and starch incorporated ranges from 2% to 8%. The mechanical, dynamic mechanical, thermal and microstructural properties were analyzed. The results from the tensile strength, yield strength, Young’s modulus, and impact showed that the PLA–chitin–starch blend has the best mechanical properties compared to PLA–chitin and PLA–starch blends. The dynamic mechanical analysis result shows a better damping property for PLA–chitin than PLA–chitin–starch and PLA–starch. On the other hand, the thermal property analysis from thermogravimetry analysis (TGA) shows no significant improvement in a specific order, but the glass transition temperature of the composite increased compared to that of neat PLA. However, the degradation process was found to start with PLA–chitin for all composites, which suggests an improvement in PLA degradation. Significantly, the morphological analysis revealed a uniform mix with an obvious blend network in the three composites. Interestingly, the network was more significant in the PLA–chitin–starch blend, which may be responsible for its significantly enhanced mechanical properties compared with PLA–chitin and PLA–starch samples.

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“…In the literature, numerous papers can be found about the utilization of bio-based as well as renewable, natural polymers in blends and composites. Bio-polyethylene [1,2], starch [3][4][5][6], protein [7,8] and lignin [9][10][11][12][13][14] have been used as a matrix or dispersed component of blends, while cellulose [15][16][17][18], chitin [5,19] and lignocellulose [4,9,[20][21][22][23][24] have been applied as a reinforcement in composites. In addition, the advantageous properties of bio-based polymers and natural fibers were combined in their composites in several cases [1,18,24].…”

Section: Introductionmentioning

confidence: 99%

The Role of Interfacial Adhesion in Polymer Composites Engineered from Lignocellulosic Agricultural Waste

et al. 2021

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This paper presents a comprehensive study about the application of a lignocellulosic agricultural waste, sunflower husk in different polymer composites. Two types of milled sunflower husk with different geometrical factors were incorporated into polypropylene, low-density and high-density polyethylene, polystyrene (PS), glycol-modified polyethylene terephthalate (PETG) and polylactic acid (PLA). The filler content of the composites varied between 0 and 60 vol%. The components were homogenized in an internal mixer and plates were compression molded for testing. The Lewis–Nielsen model was fitted to the moduli of each composite series, and it was found that the physical contact of the filler particles is a limiting factor of composite modulus. Interfacial interactions were estimated from two independent approaches. Firstly, the extent of reinforcement was determined from the composition dependence of tensile strength. Secondly, the reversible work of adhesion was calculated from the surface energies of the components. As only weak van der Waals interactions develop in the interphase of polyolefins and sunflower husk particles, adhesion is weak in their composites resulting in poor reinforcement. Interfacial adhesion enhanced by specific interactions in the interphase, such as π electron interactions for PS, hydrogen bonds for PLA, and both for PETG based composites.

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Desiccant effect of starch in polylactic acid composites

Cited by 13 publications

References 45 publications

Plasticizer Enhancement on the Miscibility and Thermomechanical Properties of Polylactic Acid-Chitin-Starch Composites

Plasticizer Enhancement on the Miscibility and Thermomechanical Properties of Polylactic Acid-Chitin-Starch Composites

Properties and Characterization of a PLA–Chitin–Starch Biodegradable Polymer Composite

The Role of Interfacial Adhesion in Polymer Composites Engineered from Lignocellulosic Agricultural Waste

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