Preparation and properties of cellulose-based carbon microsphere/poly(lactic acid) composites

Wang, Shuhua; Xu, Qiaoli; Li, Fen; Dai, Jinming; Jia, Husheng; Xu, Bingshe

doi:10.1177/0021998313485263

Cited by 27 publications

(9 citation statements)

References 11 publications

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“…In Figure 2 , the T g for the PLA blend is indicated at around 60 °C from the second heating cycle. The DSC measurement further show exothermic reactions for crystallization at 106 °C and 160 °C, in consistency with literature [ 30 , 31 ]. The shift of exothermic peaks upon cooling of the samples indicates a change in the molecular structure of the samples after heating.…”

Section: Resultssupporting

confidence: 91%

Thermal and Mechanical Properties of Esterified Lignin in Various Polymer Blends

et al. 2021

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Lignin is an abundant polymeric renewable material and thus a promising candidate for incorporation in various commercial thermoplastic polymers. One challenge is to increase the dispersibility of amphiphilic lignin in lipophilic thermoplastic polymers We altered Kraft lignin using widely available and renewable fatty acids, such as oleic acid, yielding more than 8 kg of lignin ester as a light brown powder. SEC showed a molecular weight of 5.8 kDa with a PDI = 3.80, while the Tg of the lignin ester was concluded to 70 °C. Furthermore, the lignin ester was incorporated (20%) into PLA, HDPE, and PP to establish the thermal and mechanical behavior of the blends. DSC and rheological measurements suggest that the lignin ester blends consist of a phase-separated system. The results demonstrate how esterification of lignin allows dispersion in all the evaluated thermoplastic polymers maintaining, to a large extent, the tensile properties of the original material. The impact strength of HDPE and PLA blends show substantial loss upon the addition of the lignin ester. Reconverting the acetic acid side stream into acetic anhydride and reusing the catalyst, the presented methodology can be scaled up to produce a lignin-based substitute to fossil materials.

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Section: Resultssupporting

confidence: 91%

Thermal and Mechanical Properties of Esterified Lignin in Various Polymer Blends

et al. 2021

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“…One of the ways by which polymers are being modified to suit human needs and fit for engineering applications is found in the development of bio-based composites. Natural fiber-based bio-composites are increasingly being used in items such as car interiors, electronic devices, the building, and construction sector, packaging, and so on [ 7 , 8 ]. However, natural fibers are highly heterogeneous, and their properties vary across the globe.…”

Section: Introductionmentioning

confidence: 99%

Development and characterization of moringa oleifera fruit waste pod derived particulate cellulosic reinforced epoxy bio-composites for structural applications

Oladele

Ogunwande

Taiwo

et al. 2022

Heliyon

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“…We can observe in Figure 3 that the curves of models printed with a 0 • orientation are similar to typical PLA stress-strain curves [34], whereas a 90 • orientation is not. The 90 • sample slope starts to get steeper much later than the 0 • sample slope, which could be explained by faults induced by the printing orientation: the base surface is less smooth when printed sideways (90 • ), as we can observe on Figure 2b.…”

Section: Experimental Testingmentioning

confidence: 78%

Optimizing Design Parameters of PLA 3D-Printed Scaffolds for Bone Defect Repair

et al. 2022

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Current materials used to fill bone defects (ceramics, cement) either lack strength or do not induce bone repair. The use of biodegradable polymers such as PLA may promote patient healing by stimulating the production of new bone in parallel with a controlled degradation of the scaffold. This project aims to determine the design parameters maximising scaffold mechanical performance in such materials. Starting from a base cylindrical model of 10 mm height and of outer and inner diameters of 10 and 4 mm, respectively, 27 scaffolds were designed. Three design parameters were investigated: pore distribution (crosswise, lengthwise, and eccentric), pore shape (triangular, circular, and square), and pore size (surface area of 0.25 mm2, 0.5625 mm2, and 1 mm2). Using the finite element approach, a compressive displacement (0.05 mm/s up to 15% strain) was simulated on the models and the resulting scaffold stiffnesses (N/mm2) were compared. The models presenting good mechanical behaviors were further printed along two orientations: 0° (cylinder sitting on its base) and 90° (cylinder laying on its side). A total of n = 5 specimens were printed with PLA for each of the retained models and experimentally tested using a mechanical testing machine with the same compression parameters. Rigidity and yield strength were evaluated from the experimental curves. Both numerically and experimentally, the highest rigidity was found in the model with circular pore shape, crosswise pore distribution, small pore size (surface area of 0.25 mm2), and a 90° printing orientation. Its average rigidity reached 961 ± 32 MPa from the mechanical testing and 797 MPa from the simulation, with a yield strength of 42 ± 1.5 MPa. The same model with a printing orientation of 0° resulted in an average rigidity of 515 ± 7 MPa with a yield strength of 32 ± 1.6 MPa. Printing orientation and pore size were found to be the most influential design parameters on rigidity. The developed design methodology should accelerate the identification of effective scaffolds for future in vitro and in vivo studies.

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Preparation and properties of cellulose-based carbon microsphere/poly(lactic acid) composites

Cited by 27 publications

References 11 publications

Thermal and Mechanical Properties of Esterified Lignin in Various Polymer Blends

Thermal and Mechanical Properties of Esterified Lignin in Various Polymer Blends

Development and characterization of moringa oleifera fruit waste pod derived particulate cellulosic reinforced epoxy bio-composites for structural applications

Optimizing Design Parameters of PLA 3D-Printed Scaffolds for Bone Defect Repair

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