A facile strategy for preparation of strong tough poly(lactic acid) foam with a unique microfibrillated bimodal micro/nano cellular structure

Xiang, Pei; Gou, Liangcheng; Zou, Yuan; Chen, Binyi; Shi, Bi; Chen, Xuhuang; Yu, Peng

doi:10.1016/j.ijbiomac.2021.12.187

Cited by 22 publications

(20 citation statements)

References 57 publications

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“…Closed-cell microporous foam prepared by supercritical foaming has good mechanical properties and has a promising future in architectural decoration and aerospace. Xiang et al [ 65 ] prepared PLA with an oriented crystal structure using pressure-induced flow (PIF) and then prepared PLA foam with intermittent foaming. In the PIF process, the crystals are compressed in one direction to form a selectively oriented micro fibrillated structure, Figure 10 .…”

Section: Applications Of Pla Composite Foamsmentioning

confidence: 99%

“… Typical PLA crystal structure: ( a ) crystal obtained by cold crystallization at 120 °C; ( b ) directional crystal structure formed by pressure induced flow; ( a 1 , b 1 ) are local enlarged images of the corresponding crystal. FD: flow direction, LD: load direction (reproduced with permission from Reference [ 65 ], Copyright 2022 Elsevier). …”

Section: Figurementioning

confidence: 99%

“… Image of polylactic acid foaming micro/nano bimodal cell structure after pressure induced flow. ( a ) SEM images of nano-sized cells obtained at foaming temperature of 60 °C; ( a 1 ) SEM images of nano-sized cells from the local observation of ( a ) (reproduced with permission from reference [ 65 ], Copyright 2022 Elsevier). …”

Section: Figurementioning

confidence: 99%

“… ( a ) Impact strength and ( b ) typical impact fracture photos of PLA foam samples with pressure-induced flow at different foaming temperatures (reproduced with permission from reference [ 65 ], Copyright 2022 Elsevier). …”

Section: Figurementioning

confidence: 99%

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Progress in the Preparation, Properties, and Applications of PLA and Its Composite Microporous Materials by Supercritical CO2: A Review from 2020 to 2022

Peng

Mubarak

Diao³

et al. 2022

Polymers

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The development of degradable plastic foams is in line with the current development concept of being pollution free and sustainable. Poly(lactic acid) (PLA) microporous foam with biodegradability, good heat resistance, biocompatibility, and mechanical properties can be successfully applied in cushioning packaging, heat insulation, noise reduction, filtration and adsorption, tissue engineering, and other fields. This paper summarizes and critically evaluates the latest research on preparing PLA microporous materials by supercritical carbon dioxide (scCO2) physical foaming since 2020. This paper first introduces the scCO2 foaming technologies for PLA and its composite foams, discusses the CO2-assisted foaming processes, and analyzes the effects of process parameters on PLA foaming. After that, the paper reviews the effects of modification methods such as chemical modification, filler filling, and mixing on the rheological and crystallization behaviors of PLA and provides an in-depth analysis of the mechanism of PLA foaming behavior to provide theoretical guidance for future research on PLA foaming. Lastly, the development and applications of PLA microporous materials based on scCO2 foaming technologies are prospected.

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Section: Applications Of Pla Composite Foamsmentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Section: Figurementioning

confidence: 99%

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Progress in the Preparation, Properties, and Applications of PLA and Its Composite Microporous Materials by Supercritical CO2: A Review from 2020 to 2022

Peng

Mubarak

Diao³

et al. 2022

Polymers

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“…They proved the scaffolds supported the attachment and growth of human mesenchymal stem cells and the biocompatibility, safety and vascularization of the scaffolds [ 43 ]. Xiang et al fabricated a strong, tough poly(lactic acid) foam by combining pressure induced-flow processing with supercritical CO 2 foaming to obtain biomedical materials with better mechanical properties [ 44 ]. All of these results emphasize how important it is to develop a method to produce polymeric scaffolds structures that can be successfully used in tissue engineering.…”

Section: Introductionmentioning

confidence: 99%

An Attempt to Optimize Supercritical CO2 Polyaniline-Polycaprolactone Foaming Processes to Produce Tissue Engineering Scaffolds

et al. 2022

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Conjugated polymers are biomaterials with high conductivity characteristics because of their molecular composition. However, they are too rigid and brittle for medical applications and therefore need to be combined with non-conductive polymers to overcome or lessen these drawbacks. This work has, consequently, focused on the development of three-dimensional scaffolds where conductive and non-conductive polymers have been produced by combining polycaprolactone (PCL) and polyaniline (PANI) by means of supercritical CO2 foaming techniques. To evaluate their therapeutic potential as implants, a series of experiments have been designed to determine the most influential variables in the production of the three-dimensional scaffolds, including temperature, pressure, polymer ratio and depressurization rate. Internal morphology, porosity, expansion factor, PANI loads, biodegradability, mechanical and electrical properties have been taken as the response variables. The results revealed a strong influence from all the input variables studied, as well as from their interactions. The best operating conditions tested were 70 °C, 100 bar, a ratio of 5:1 (PCL:PANI), a depressurization rate of 20 bar/min and a contact time of 1 h.

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Mild Fabrication of Polymeric Porous/Nonporous Micro‐Composite Structures via Enhancing the Photothermal Conversion of Ultrafast Laser

Xiang,

Zhang,

Zhang

et al. 2024

Adv Funct Materials

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Localized foaming of polymers is promising to fabricate polymeric composite structures for applications in biomedical, aerospace, automotive, etc. However, the severe pyrolysis and carbonization of polymer chains during localized foaming may degrade the bulk strength. Herein, a mild localized foaming strategy is proposed to fabricate poly(lactic acid) (PLA) micro‐foams within dense PLA matrices using ultrafast lasers. The PLA substrates doped with graphene (Gr) and azodicarbonamide (AC) are developed for mild foaming. A picosecond laser is applied to pattern PLA micro‐foams on the PLA/Gr/AC substrates to fabricate porous/nonporous micro‐composite structures. The thermal behavior of the PLA/Gr/AC substrates is characterized to evaluate their capability in photothermal conversion and mild foaming during ultrafast laser pulses. To optimize the laser foaming process, the microstructure of the laser‐foamed PLA processed with different laser parameters is studied. It demonstrates that the oxidation of the functional groups dominates the side reactions on the PLA chains with slight variation in molecular weight during laser foaming, indicating that the PLA chains keep almost intact and mild localized foaming is realized. Furthermore, the developed technology is demonstrated for micro‐patterning and texturing, material toughness programming, and shape memory programming, showing promising applications for smart materials, metamaterials, micro‐robotics, and biological scaffolds.

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A facile strategy for preparation of strong tough poly(lactic acid) foam with a unique microfibrillated bimodal micro/nano cellular structure

Cited by 22 publications

References 57 publications

Progress in the Preparation, Properties, and Applications of PLA and Its Composite Microporous Materials by Supercritical CO2: A Review from 2020 to 2022

Progress in the Preparation, Properties, and Applications of PLA and Its Composite Microporous Materials by Supercritical CO2: A Review from 2020 to 2022

An Attempt to Optimize Supercritical CO2 Polyaniline-Polycaprolactone Foaming Processes to Produce Tissue Engineering Scaffolds

Mild Fabrication of Polymeric Porous/Nonporous Micro‐Composite Structures via Enhancing the Photothermal Conversion of Ultrafast Laser

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