Natural Biopolymer Alloys with Superior Mechanical Properties

Meng, Linghan; Xie, Fengwei; Zhang, Binjia; Wang, David; Yu, Long

doi:10.1021/acssuschemeng.8b06009

Cited by 40 publications

(27 citation statements)

References 77 publications

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“…For better examining the degradation steps, the plots of derivative weight as a function of temperature were shown in Figure 7(c). For chitosan, there was a large thermal decomposition peak spanning from about 200 C to 400 C, with a peak maximum (T d ) at 296 C, in agreement with previous reports [18,26,32]. SP displayed a broad thermal decomposition peak starting from about 130 C and ending at 470 C, with a doublet of peaks at 221 C and 232 C [26], which is most likely related to the breakage of peptide bonds (de-polymerization) and the pyrolysis of the de-polymerized products [9].…”

Section: Resultssupporting

confidence: 91%

“…Methanol may allow SP to undergo conformational changes (i.e. the formation of b-sheets, possibly leading to enhanced mechanical properties and reduced hydrophilicity); and NaOH solution could neutralize the acid and enhance the biopolymer mechanical properties [26]. The sheets obtained were cut into Type V dumbbell-shaped specimens according to ASTM Standard D638-14.…”

Section: Sample Preparationmentioning

confidence: 99%

“…Tensile tests were performed using an Instron 3367 universal testing machine with a 1 kN load cell. A low constant crosshead speed of 3 mm/min was used due to the brittle nature of the biopolymer films [26]. As the specimens were in the form of thin sheets, specimen extension was measured by grip separation as recommended in ASTM Standard D882.…”

Section: Characterizationmentioning

confidence: 99%

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Structure and properties of thermomechanically processed silk peptide and nanoclay filled chitosan

et al. 2020

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While chitosan has great potential for biomedical and wider application due to its appealing characteristics such as biocompatibility and inherent antimicrobial activity, its properties usually need to be further tailored for specific uses. In this study, the effect of inclusion of silk peptide (SP) and nanoclays (montmorillonite, MMT and sepiolite, SPT) on the properties of thermomechanically processed chitosan were examined. Blending SP with chitosan led to a material with greater elasticity and surface wettability. For the chitosan matrix, addition of either MMT or SPT resulted in increased mechanical properties with MMT being more effective, likely due to its 2D layered structure. For the chitosan/SP matrix, while inclusion of MMT caused increased mechanical properties and thermal stability, SPT was more effective than MMT at reducing surface hydrophilicity and SPT fully counteracted the increased surface hydrophilicity caused by SP. Thus, this work shows the different effects of MMT and SPT on chitosan-based materials and provides insights into achieving balanced properties.inclusion of ARTICLE HISTORY

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Section: Resultssupporting

confidence: 91%

Section: Sample Preparationmentioning

confidence: 99%

Section: Characterizationmentioning

confidence: 99%

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Structure and properties of thermomechanically processed silk peptide and nanoclay filled chitosan

et al. 2020

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“…Biodegradable polymers such as poly-L-lactic acid, poly-glycolic acid, and copolymers with Food and Drug Administration (FDA) approval for human clinical use have also been extensively used in preclinical studies of bone tissue engineering. However, the application of biopolymer materials suffers from poor processability and weak mechanical properties [13]. Magnesium (Mg) alloys are significantly more flexible than bioceramics, mechanically stronger than biopolymers with the advantage of bioabsorption capabilities over other biometals [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Biodegradable Magnesium Bone Implants Coated with a Novel Bioceramic Nanocomposite

et al. 2020

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Magnesium (Mg) alloys are being investigated as a biodegradable metallic biomaterial because of their mechanical property profile, which is similar to the human bone. However, implants based on Mg alloys are corroded quickly in the body before the bone fracture is fully healed. Therefore, we aimed to reduce the corrosion rate of Mg using a double protective layer. We used a magnesium-aluminum-zinc alloy (AZ91) and treated its surface with micro-arc oxidation (MAO) technique to first form an intermediate layer. Next, a bioceramic nanocomposite composed of diopside, bredigite, and fluoridated hydroxyapatite (FHA) was coated on the surface of MAO treated AZ91 using the electrophoretic deposition (EPD) technique. Our in vivo results showed a significant enhancement in the bioactivity of the nanocomposite coated AZ91 implant compared to the uncoated control implant. Implantation of the uncoated AZ91 caused a significant release of hydrogen bubbles around the implant, which was reduced when the nanocomposite coated implants were used. Using histology, this reduction in the corrosion rate of the coated implants resulted in an improved new bone formation and reduced inflammation in the interface of the implants and the surrounding tissue. Hence, our strategy using a MAO/EPD of a bioceramic nanocomposite coating (i.e., diopside-bredigite-FHA) can significantly reduce the corrosion rate and improve the bioactivity of the biodegradable AZ91 Mg implant.

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“…The development of polymer blends and composites has been considered to be one of the most cost-effective methods of modifying the bulk properties of individual polymers, achieving enhanced and/or new material properties, reducing costs, and expanding the applications of polymeric materials [8,16,30,31,32,33,34,35,36,37]. While cellulose-starch hybrid materials have already been studied widely, most of the work has focused on starch matrices reinforced by cellulose nanowhiskers/nanofibers [38,39,40,41,42,43,44].…”

Section: Introductionmentioning

confidence: 99%

Cellulose-starch Hybrid Films Plasticized by Aqueous ZnCl2 Solution

Shang

Jiang

Wang

et al. 2019

IJMS

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Starch and cellulose are two typical natural polymers from plants that have similar chemical structures. The blending of these two biopolymers for materials development is an interesting topic, although how their molecular interactions could influence the conformation and properties of the resultant materials has not been studied extensively. Herein, the rheological properties of cellulose/starch/ZnCl2 solutions were studied, and the structures and properties of cellulose-starch hybrid films were characterized. The rheological study shows that compared with starch (containing mostly amylose), cellulose contributed more to the solution’s viscosity and has a stronger shear-thinning behavior. A comparison between the experimental and calculated zero-shear-rate viscosities indicates that compact complexes (interfacial interactions) formed between cellulose and starch with ≤50 wt % cellulose content, whereas a loose structure (phase separation) existed with ≥70 wt % cellulose content. For starch-rich hybrid films prepared by compression molding, less than 7 wt % of cellulose was found to improve the mechanical properties despite the reduced crystallinity of the starch; for cellulose-rich hybrid films, a higher content of starch reduced the material properties, although the chemical interactions were not apparently influenced. It is concluded that the mechanical properties of biopolymer films were mainly affected by the structural conformation, as indicated by the rheological results.

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Natural Biopolymer Alloys with Superior Mechanical Properties

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Cited by 40 publications

References 77 publications

Structure and properties of thermomechanically processed silk peptide and nanoclay filled chitosan

Structure and properties of thermomechanically processed silk peptide and nanoclay filled chitosan

Biodegradable Magnesium Bone Implants Coated with a Novel Bioceramic Nanocomposite

Cellulose-starch Hybrid Films Plasticized by Aqueous ZnCl2 Solution

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