The Influence of Compatibility on the Structure and Properties of PLA/Lignin Biocomposites by Chemical Modification

Lignin, a natural amorphous three-dimensional aromatic polymer, is investigated as an appropriate filler for biocomposites. The chemical modification of firsthand lignin is an effective pathway to accomplish acetoacetate functional groups replacing polar hydroxyl (–OH) groups, which capacitates lignin to possess better miscibility with poly(lactic acid) (PLA), compared with acidified lignin (Ac-lignin) and butyric lignin (By-lignin), for the sake of blending with poly(lactic acid) (PLA) to constitute a new biopolymer based composites. Generally speaking, the characterization of all PLA composites has been performed taking advantage of Fourier transform infrared (FTIR), scanning electron microscopy (SEM), dynamic Mechanical analysis (DMA), differential scanning calorimeter (DSC), thermogravimetric analysis (TGA), rheological analysis, and tensile test. Visibly, it is significant to highlight that the existence of acetoacetate functional groups enhances the miscibility, interfacial compatibility, and interface interaction between acetoacetate lignin (At-lignin) and PLA. Identical conclusions were obtained in this study where PLA/At-lignin biocomposites furthest maintain the tensile strength of pure PLA.

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Chemical modification of nanocrystalline cellulose for improved interfacial compatibility with poly(lactic acid)

Mendeleev Communications ◽

10.1016/j.mencom.2019.03.036 ◽

2019 ◽

Vol 29 (2) ◽

pp. 220-222 ◽

Cited By ~ 6

Author(s):

Ilia V. Averianov ◽

Mariia A. Stepanova ◽

Iosif V. Gofman ◽

Alexandra L. Nikolaeva ◽

Viktor A. Korzhikov-Vlakh ◽

...

Keyword(s):

Lactic Acid ◽

Chemical Modification ◽

Nanocrystalline Cellulose ◽

Poly Lactic Acid ◽

Interfacial Compatibility

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Characterization of Natural Composites Fabricated from Abutilon-Fiber-Reinforced Poly (Lactic Acid)

Processes ◽

10.3390/pr7090583 ◽

2019 ◽

Vol 7 (9) ◽

pp. 583 ◽

Cited By ~ 6

Author(s):

Wang ◽

Hassan ◽

Memon ◽

Elagib ◽

AllaIdris

Keyword(s):

Lactic Acid ◽

Natural Fiber ◽

Nucleating Agent ◽

Mechanical Analysis ◽

Morphological Properties ◽

Poly Lactic Acid ◽

Fiber Reinforced ◽

Natural Composites ◽

Thermal Stability Of

In recent decades, natural-fiber-reinforced poly (lactic acid) (PLA) composites have received a great deal of attention. In this study, biocomposites of poly (lactic acid) and abutilon fibers are prepared by using melt blending and an extruder. The effects of fiber additions on rheological, thermomechanical, thermal, and morphological properties are investigated using a rheometer, dynamic mechanical analysis (DMA), differential scanning calorimeter (DSC), TGA, and SEM, respectively. The DSC results indicate that the fibers acted as a nucleating agent, which led to enhancing the crystallization of PLA. The results also reveal that the thermal stability of PLA was improved by abutilon fibers. Moreover, higher values of storage modulus are observed, which are attributed to strong interfacial adhesion. In addition, thetan delta isreduced upon the addition of fiber content into the PLA matrix, which restricts the mobility of PLA polymer molecules in the presence of the fibers. The improvement of the properties and energy absorption capabilities of such biocomposites signifies the great potential of abutilon fibers as reinforcement in green composites.

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Preparation and characterization of solution blended poly(ethylene terephthalate-co-ethylene furandicarboxylate) and poly(lactic acid)

Future Energy, Environment and Materials ◽

10.2495/feem130771 ◽

2014 ◽

Author(s):

Hae-Ri Kim ◽

Byeong-Uk Nam ◽

Yeon-Hee Kim

Keyword(s):

Lactic Acid ◽

Ethylene Terephthalate ◽

Poly Lactic Acid ◽

Poly Ethylene Terephthalate ◽

Poly Ethylene

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Preparation and characterization of micro-graphite filled poly(lactic acid) composites: Part 2 - Crystallinity and electrical properties

10.1063/5.0030590 ◽

2020 ◽

Author(s):

Esa Nur Shohih ◽

Mujtahid Kaavessina ◽

Sperisa Distantina

Keyword(s):

Lactic Acid ◽

Electrical Properties ◽

Poly Lactic Acid

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Development of three-dimensional printing filaments based on poly(lactic acid)/hydroxyapatite composites with potential for tissue engineering

Journal of Composite Materials ◽

10.1177/0021998320988568 ◽

2021 ◽

pp. 002199832098856

Author(s):

Marcela Piassi Bernardo ◽

Bruna Cristina Rodrigues da Silva ◽

Luiz Henrique Capparelli Mattoso

Keyword(s):

Tissue Engineering ◽

Lactic Acid ◽

Fused Deposition Modeling ◽

Three Dimensional ◽

Poly Lactic Acid ◽

Scanning Calorimetry ◽

Three Dimensional Printing ◽

Fused Deposition ◽

Deposition Modeling ◽

3D Printed

Injured bone tissues can be healed with scaffolds, which could be manufactured using the fused deposition modeling (FDM) strategy. Poly(lactic acid) (PLA) is one of the most biocompatible polymers suitable for FDM, while hydroxyapatite (HA) could improve the bioactivity of scaffold due to its chemical composition. Therefore, the combination of PLA/HA can create composite filaments adequate for FDM and with high osteoconductive and osteointegration potentials. In this work, we proposed a different approache to improve the potential bioactivity of 3D printed scaffolds for bone tissue engineering by increasing the HA loading (20-30%) in the PLA composite filaments. Two routes were investigated regarding the use of solvents in the filament production. To assess the suitability of the FDM-3D printing process, and the influence of the HA content on the polymer matrix, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM) were performed. The HA phase content of the composite filaments agreed with the initial composite proportions. The wettability of the 3D printed scaffolds was also increased. It was shown a greener route for obtaining composite filaments that generate scaffolds with properties similar to those obtained by the solvent casting, with high HA content and great potential to be used as a bone graft.

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Effects of Rice Straw Powder (RSP) Size and Pretreatment on Properties of FDM 3D-Printed RSP/Poly(Lactic Acid) Biocomposites

Molecules ◽

10.3390/molecules26113234 ◽

2021 ◽

Vol 26 (11) ◽

pp. 3234

Author(s):

Wangwang Yu ◽

Lili Dong ◽

Wen Lei ◽

Yuhan Zhou ◽

Yongzhe Pu ◽

...

Keyword(s):

Lactic Acid ◽

Rice Straw ◽

Fused Deposition Modeling ◽

Flexural Modulus ◽

Tensile Modulus ◽

Cost Effective ◽

Poly Lactic Acid ◽

Fused Deposition ◽

Interfacial Compatibility ◽

3D Printed

To develop a new kind of environment-friendly composite filament for fused deposition modeling (FDM) 3D printing, rice straw powder (RSP)/poly(lactic acid) (PLA) biocomposites were FDM-3D-printed, and the effects of the particle size and pretreatment of RSP on the properties of RSP/PLA biocomposites were investigated. The results indicated that the 120-mesh RSP/PLA biocomposites (named 120#RSP/PLA) showed better performance than RSP/PLA biocomposites prepared with other RSP sizes. Infrared results showed that pretreatment of RSP by different methods was successful, and scanning electron microscopy indicated that composites prepared after pretreatment exhibited good interfacial compatibility due to a preferable binding force between fiber and matrix. When RSP was synergistically pretreated by alkaline and ultrasound, the composite exhibited a high tensile strength, tensile modulus, flexural strength, and flexural modulus of 58.59, 568.68, 90.32, and 3218.12 MPa, respectively, reflecting an increase of 31.19%, 16.48%, 18.75%, and 25.27%, respectively, compared with unmodified 120#RSP/PLA. Pretreatment of RSP also improved the thermal stability and hydrophobic properties, while reducing the water absorption of 120#RSP/PLA. This work is believed to provide highlights of the development of cost-effective biocomposite filaments and improvement of the properties of FDM parts.

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The synthesis, characterization of opal-poly(methyl methacrylate) graft polymer based on ICAR-ATRP and its effect on performance of poly (lactic acid)

Polymer-Plastics Technology and Materials ◽

10.1080/25740881.2021.1876878 ◽

2021 ◽

Vol 60 (10) ◽

pp. 1051-1065

Author(s):

Dawei Luo ◽

Gaowei Lei ◽

Weijun Zhen ◽

Ling Zhao

Keyword(s):

Lactic Acid ◽

Methyl Methacrylate ◽

Poly Lactic Acid ◽

Graft Polymer ◽

Poly Methyl Methacrylate

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Poly-(lactic acid) and fibrin bioactive cellularized scaffold for use in bone regenerative medicine: Proof of concept

Journal of Bioactive and Compatible Polymers ◽

10.1177/0883911521996402 ◽

2021 ◽

pp. 088391152199640

Author(s):

Renata Aquino de Carvalho ◽

Valmir Vieira Rocha Júnior ◽

Antonio José Felix Carvalho ◽

Heloisa Sobreiro Selistre de Araújo ◽

Mônica Rosas Costa Iemma ◽

...

Keyword(s):

Lactic Acid ◽

Regenerative Medicine ◽

Platelet Rich Plasma ◽

Three Dimensional ◽

Culture Conditions ◽

Infrapatellar Fat Pad ◽

Dimensional Structure ◽

Poly Lactic Acid ◽

Proof Of Concept ◽

Critical Bone Defects

Bone regenerative medicine (BRM) aims to overcome the limitations of conventional treatments for critical bone defects by developing therapeutic strategies, based on temporary bioactive substitutes, capable of stimulating, sustaining, and guiding tissue regeneration. The aim of this study was to validate the “proof of concept” of a cellularized bioactive scaffold and establish its potential for use in BRM. For this purpose, three-dimensional scaffolds of poly-(lactic acid) (PLA), produced by the additive manufacturing technique, were incorporated into a human platelet-rich plasma (PRP-h) fibrin matrix containing human infrapatellar fat pad mesenchymal stem cells (hIFPMSC). The scaffolds (PLA/finbrin-bioactive) were kept under ideal culture conditions in a medium free from fetal bovine serum and analyzed at 5 and 10 days by Scanning Electron Microscopy (SEM), Fourrier Transform Infrared (FTIR), Circular Dichroism and fluorescence microscopy. The results demonstrated the feasibility of obtaining a rigid, cytocompatible, and cellularized three-dimensional structure. In addition, PRP platelets and leukocytes were able to provide a bioactive environment capable of maintaining the viability of hIFPMSC into scaffolds. The results validate the concept of a customizable, bioactive, cellularized, and non-immunogenic strategy for application in BRM.

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Synthesis and Characterization of Polyphosphazenes Modified with Hydroxyethyl Methacrylate and Lactic Acid

International Journal of Polymer Science ◽

10.1155/2013/645869 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 1

Author(s):

Evelyn Carolina Martínez Ceballos ◽

Ricardo Vera Graziano ◽

Gonzalo Martínez Barrera ◽

Oscar Olea Mejía

Keyword(s):

Lactic Acid ◽

Ring Opening ◽

Room Temperature ◽

Block Structure ◽

Ring Opening Polymerization ◽

Synthesis And Characterization ◽

Poly Lactic Acid ◽

Hydroxyethyl Methacrylate ◽

H Nmr

Poly(dichlorophosphazene) was prepared by melt ring-opening polymerization of the hexachlorocyclotriphosphazene. Poly[bis(2-hydroxyethyl-methacrylate)-phosphazene] and poly[(2-hydroxyethyl-methacrylate)-graft-poly(lactic-acid)-phosphazene] were obtained by nucleophilic condensation reactions at different concentrations of the substituents. The properties of the synthesized copolymers were assessed by FTIR,1H-NMR and31P-NMR, thermal analysis (DSC-TGA), and electron microscopy (SEM). The copolymers have a block structure and show twoTg's below room temperature. They are stable up to a temperature of 100°C. The type of the substituents attached to the PZ backbone determines the morphology of the polymers.

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