Poly(lactic acid)/starch composites: Effect of microstructure and morphology of starch granules on performance

Khalid, Saud; Meng, Linghan; Liu, Huan; Ali, Amjad; Chen, Ling

doi:10.1002/app.45504

Cited by 28 publications

(30 citation statements)

References 68 publications

(97 reference statements)

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“…[16] Such complexes between starch side chains, released after enzymatic debranching, and stearic acid, can result in high amounts of starch-stearic acid complexes exhibiting B-and V-type crystalline diffraction patterns. [17] Type III RS (RS3) was prepared from corn starch by combination of treatment with the organic acids citric, malic, and succinic acids and using autoclaving cooling cycle. [18] The RS levels were found to be increased by increasing the acid concentration as demonstrated for corn meal mixed with citric acid (0, 2.5, 5.0, and 7.5%) and extruded.…”

Section: Introductionmentioning

confidence: 99%

Modification of Moth Bean Starch Using Mixture of Organic Acids under Dry Heating

et al. 2019

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Moth bean (Vigna aconitifolia) starch is modified in its dry state (110 °C for 8 h, 14% moisture) using various ratios of organic acids (citric acid and stearic acid) in solvent free (solid–solid) reaction mode. Apparent amylose content is observed to increase in organic acid treated starches. Modified starches show lower swelling power than native starch. Scanning electron micrographs display rough granules surface for treated starches. Crystalline polymorphic pattern of moth bean starch is unaffected by organic acid treatment and dry heating. However, relative crystallinity increases after dry modification. Pasting properties indicate reduction following hydrolysis and loss of granular strength. Resistant starch (RS) content increases as an effect of the modification. This novel modification provides different functionality as compared to aqueous protocols and also provides a clean alternative to replace acid hydrolysis process with concentrated mineral acids.

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Section: Introductionmentioning

confidence: 99%

Modification of Moth Bean Starch Using Mixture of Organic Acids under Dry Heating

et al. 2019

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“…Fiber diameter Poly(ε-caprolactone)/chitosan blend [65] Size and ahape Starch granules [66,67] Filler dispersion starch/ Gum Arabic/nanocellulose [68] Scanning electron microscopy (SEM)…”

Section: Technique Application Biopolymer Referencesmentioning

confidence: 99%

“…Particle size Chitosan [69] Particle shape Starch granules [66] Fiber diameter and surface modification…”

Section: Technique Application Biopolymer Referencesmentioning

confidence: 99%

“…It has been successfully used in determining the uniformity of poly(ε-caprolactone)/chitosan blend fibers to be used in tissue engineering [65], wherein the dry fiber diameter as a function of total polymer concentration was analyzed and the average fiber diameter was determined by utilizing the microscopy images with a computer image analyzer [65]. Similarly, optical microscopy has been used to analyze the microstructure and morphology of starch granules assisting in determining the performance of the composites as a function of the size and shape of the granules [66]. Results acquired via an optical microscope with 50× magnification revealed that the granules had a variety of morphology from oval, spherical, polygon, to irregular shapes depending on their botanical origin [66].…”

Section: Optical Microscopymentioning

confidence: 99%

“…Similarly, optical microscopy has been used to analyze the microstructure and morphology of starch granules assisting in determining the performance of the composites as a function of the size and shape of the granules [66]. Results acquired via an optical microscope with 50× magnification revealed that the granules had a variety of morphology from oval, spherical, polygon, to irregular shapes depending on their botanical origin [66]. Govindaraju et al made similar observations, where they observed varied morphology of starch granules obtained from different sources ( Figure 3); besides evaluating the granule sizes and observing starch degradation after hydrolysis [67], the granules were found to be polyhedral in the case of rice starch, while corn starch showed spherical and polyhedral structures.…”

Section: Optical Microscopymentioning

confidence: 99%

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Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives

et al. 2020

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Natural biopolymers, a class of materials extracted from renewable sources, is garnering interest due to growing concerns over environmental safety; biopolymers have the advantage of biocompatibility and biodegradability, an imperative requirement. The synthesis of nanoparticles and nanofibers from biopolymers provides a green platform relative to the conventional methods that use hazardous chemicals. However, it is challenging to characterize these nanoparticles and fibers due to the variation in size, shape, and morphology. In order to evaluate these properties, microscopic techniques such as optical microscopy, atomic force microscopy (AFM), and transmission electron microscopy (TEM) are essential. With the advent of new biopolymer systems, it is necessary to obtain insights into the fundamental structures of these systems to determine their structural, physical, and morphological properties, which play a vital role in defining their performance and applications. Microscopic techniques perform a decisive role in revealing intricate details, which assists in the appraisal of microstructure, surface morphology, chemical composition, and interfacial properties. This review highlights the significance of various microscopic techniques incorporating the literature details that help characterize biopolymers and their derivatives.

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Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

Kaya

Kamacı

2019

J of Applied Polymer Sci

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A new series of poly(azomethine‐imide)s having siloxane moities in backbone was prepared using different dianhydrides.Thermal, optical, and morphological properties of these polymers were clarified. Also, bulky CO and CF3 group effects and meta or para‐substituted aldeyhde effects on the mentioned properties were evaluated. The structural characterization of poly(azomethine‐imide)s was carried out using a FT‐IR spectroscopy. The optical properties of the polymers were performed via an UV–Vis spectrophotometer. Optical band gap of the poly(imide)s containing azomethine was calculated between 2.20 and 2.33 eV. Thermal behavior of poly(azomethine‐imide)s was also studied using TG‐DTA, DSC, and DMA techniques. The onset degradation temperature and percentage char values of the polyimides were found in the range from 429 to 545 °C and 22 to 35%, respectively. Thermal stability results demonstrated that benzophenone bearing poly(azomethine‐imide)s have higher onset temperature, percentage char, and the glass transition temperature than poly(azomethine‐imide)s derived from hexafluoroisopropylidene. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48364.

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Poly(lactic acid)/starch composites: Effect of microstructure and morphology of starch granules on performance

Cited by 28 publications

References 68 publications

Modification of Moth Bean Starch Using Mixture of Organic Acids under Dry Heating

Modification of Moth Bean Starch Using Mixture of Organic Acids under Dry Heating

Microscopic Techniques for the Analysis of Micro and Nanostructures of Biopolymers and Their Derivatives

Poly(azomethine‐imide)s containing siloxane moities: Optical, thermal, mechanical, and morphological properties

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