Microcellular PLA/PMMA foam fabricated by CO2 foaming with outstanding shape-memory performance

Chai, Jialong; Wang, Guilong; Zhao, Jinchuan; Zhang, Aimin; Shi, Zhanlin; Wei, Chao; Zhao, Guoqun

doi:10.1016/j.jcou.2021.101553

Cited by 49 publications

(22 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Biopolymer foams are commonly obtained by foam processing in batches previously obtaining pellet or films through casting processes [ 25 , 26 ], injection molding [ 27 ], compression molding [ 28 , 29 ] or melt extrusion [ 23 , 30 , 31 ]. However, with the aim to transfer the PLA foaming process from the laboratory to the industrial scale, films made by high-productivity techniques, such as extrusion, should be converted into foams.…”

Section: Introductionmentioning

confidence: 99%

Processing Compostable PLA/Organoclay Bionanocomposite Foams by Supercritical CO2 Foaming for Sustainable Food Packaging

et al. 2022

View full text Add to dashboard Cite

This article proposes a foaming method using supercritical carbon dioxide (scCO2) to obtain compostable bionanocomposite foams based on PLA and organoclay (C30B) where this bionanocomposite was fabricated by a previous hot melt extrusion step. Neat PLA films and PLA/C30B films (1, 2, and 3 wt.%) were obtained by using a melt extrusion process followed by a film forming process obtaining films with thicknesses between 500 and 600 μm. Films were further processed into foams in a high-pressure cell with scCO2 under constant conditions of pressure (25 MPa) and temperature (130 °C) for 30 min. Bionanocomposite PLA foams evidenced a closed cell and uniform cell structure; however, neat PLA presented a poor cell structure and thick cell walls. The thermal stability was significantly enhanced in the bionanocomposite foam samples by the good dispersion of nanoclays due to scCO2, as demonstrated by X-ray diffraction analysis. The bionanocomposite foams showed improved overall mechanical performance due to well-dispersed nanoclays promoting increased interfacial adhesion with the polymeric matrix. The water uptake behavior of bionanocomposite foams showed that they practically did not absorb water during the first week of immersion in water. Finally, PLA foams were disintegrated under standard composting conditions at higher rates than PLA films, showing their sustainable character. Thus, PLA bionanocomposite foams obtained by batch supercritical foaming seem to be a sustainable option to replace non-biodegradable expanded polystyrene, and they represent a promising alternative to be considered in applications such as food packaging and other products.

show abstract

Section: Introductionmentioning

confidence: 99%

Processing Compostable PLA/Organoclay Bionanocomposite Foams by Supercritical CO2 Foaming for Sustainable Food Packaging

et al. 2022

View full text Add to dashboard Cite

show abstract

“…In this stage, the temporary shape of SMPs could be obtained by the external force. Rigid regions, composed of rigid segments, chain entanglements, crystalline phases, and crosslinking points, are involved in the structural stability and recovery of permanent shape. − Programable deformation ability allows SMPs to be widely used in fields, such as biomedical tissues, smart actuators, electronic devices, and aerospace structures, − which could be triggered by diverse external stimuli, including heat, light, electricity, magnetic field, and solvent . Nevertheless, SMPs, such as polylactic acid, − polyurethane, − and polycaprolactone, − with excellent self-deformation ability, usually exhibit the weak mechanical performances and poor thermal stability, which restrict their applications in engineering structures.…”

Section: Introductionmentioning

confidence: 99%

Enhanced Shape Memory Metal-Coordinated Poly(aryl ether ketone)s with Tunable Gradient-Deformation Behaviors as well as Self-Healing and Reprocessing Abilities

Yang

Leng

2022

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

Reversible dynamic bonds are able to crack and recombine upon external stimuli, which endow polymers with exceptional self-healing, reprocessing, and reversible deformation ability. In this paper, we integrated the metal coordination bonds into shape memory poly(aryl ether ketone) (PAEK) to fabricate smart materials with multifunctionalities. Through tuning the metal ion content and species, the enhancement of shape memory behaviors was achieved, including the high recovery ratio (over 98%) and fixity ratio (over 98%), which was closely related to the synergic effect of the intrinsic motion ability of PAEK matrix and the cracking-recombination of coordination bonds. Besides, through the combination of the components with different Cu 2+ contents, in addition to the components with Fe 2+ coordination bonds, we fabricated the gradient shape memory structures with controllable shape memory and recovery behaviors. The manipulation of gradient coordination bonds resulted in different shape recovery speeds and directions. Furthermore, due to the dynamic cracking-recombination of coordination bonds, the metal-coordinated PAEK material exhibited the great selfhealing and reprocessing performances, which were significant for largely extending its application range.

show abstract

“…To obtain porous materials with a good shape effect, Chai et al [ 68 ] obtained specimens by co-blending different contents of poly(methyl methacrylate) (PMMA) and PLA through a twin-screw extruder. They prepared porous structural materials by a two-step method using CO 2 as the foaming agent.…”

Section: Effect Of Modifications On Foaming Of Pla Compositesmentioning

confidence: 99%

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

View full text Add to dashboard Cite

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.

show abstract

Microcellular PLA/PMMA foam fabricated by CO2 foaming with outstanding shape-memory performance

Cited by 49 publications

References 49 publications

Processing Compostable PLA/Organoclay Bionanocomposite Foams by Supercritical CO2 Foaming for Sustainable Food Packaging

Processing Compostable PLA/Organoclay Bionanocomposite Foams by Supercritical CO2 Foaming for Sustainable Food Packaging

Enhanced Shape Memory Metal-Coordinated Poly(aryl ether ketone)s with Tunable Gradient-Deformation Behaviors as well as Self-Healing and Reprocessing Abilities

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

Contact Info

Product

Resources

About