Biodegradable PLA/PBS open-cell foam fabricated by supercritical CO2 foaming for selective oil-adsorption

Li, Bo; Zhao, Guoqun; Wang, Guilong; Zhang, Lei; Gong, Jie; Shi, Zhanlin

doi:10.1016/j.seppur.2020.117949

Cited by 83 publications

(49 citation statements)

References 68 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The foaming experiments were carried out using the modified cooling foaming strategy proposed in our previous work. [40] First, the cylindrical PLA sample was placed and sealed in the autoclave at room temperature. Then, a constant pressure syringe pump (260D, Teledyne ISCO, USA) was used to fill the autoclave with CO 2 at a certain saturation pressure.…”

Section: Methodsmentioning

confidence: 99%

“…For the saturation pressure of 6.9, 10.3, 13.8, and 17.2 MPa, the depressurization rates within the initial 0.1 s at room temperature were about 16, 51, 86, and 121 MPa s −1 , respectively. [17,40] Finally, the autoclave was quenched in water to stabilize foam structure, and then opened to collect the foam. The foaming experiment under the same conditions was carried out at least three times to ensure the repeatability and stability of the experimental results.…”

Section: Methodsmentioning

confidence: 99%

“…[39] This limits the application of PLA foam in oiladsorption and thermal-insulation. [40,41] Towards obtaining bio-materials with excellent oil-adsorption and thermal-insulation properties, high-expansion PLA foams with open-cell and closed-cell structure were prepared using unmodified pure liner PLA and a modified supercritical CO 2 foaming strategy in this work. First, foaming experiments were carried out under various saturation pressures and foaming temperatures and a series of PLA foams with tunable cell structure parameters in a wide range were prepared.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming

Zhao

Wang

et al. 2021

Advanced Sustainable Systems

Self Cite

View full text Add to dashboard Cite

current materials are mostly traditional petroleum-based polymers. [5,6] This will consume petrochemical resources and produce massive hardly degradable waste. [7] Second, toxic organic solvents or flammable foaming agents are widely used in the current preparation processes. [2,3] In addition, the relationship between the foam structure and the oil-adsorption and thermal-insulation performance is still unclear, thus limiting the development of high-performance foams.Poly(lactic acid) (PLA) is one of the biobased and biodegradable polymers with the most potential to replace traditional petroleum-based polymers. [8] Microcellular foaming is a green and safe technology in which supercritical CO 2 or N 2 is used as the physical foaming agent. [9] Therefore, it is an eco-friendly solution to use the microcellular foaming technology to prepare PLA foams for oil-adsorption and thermal-insulation application. Highperformance oil-adsorption materials should have high expansion ratio and open-cell structure, [10] and thermal-insulation materials generally require high expansion ratio and closed-cell structure. [11] However, the preparation of PLA foam with high expansion ratio is still very challenging. [12] The factors affecting the expansion ratio are very complex and can be divided into material structure and process parameters. The material structure mainly includes chain structure, crystalline structure, blend phase structure, etc. [12,13] And the process parameters mainly contain temperature, gas pressure, depressurization rate, etc. [12,14] These factors will affect the gas concentration, polymer viscoelasticity, heterogeneous nucleation, etc.; and then act on the cell nucleation, cell growth and cell stabilization; and finally influence the expansion ratio. [9,12,14] Specially, the PLA is a semi-crystalline polymer with low melt strength and complicated relationship between crystallization and foaming. First, CO 2 can reduce the crystallization and melting temperature of PLA, [9] and change its crystal morphology. [15,16] Meanwhile, crystals in turn can hinder the dissolution of CO 2 in the PLA. [17,18] Second, excessive crystallization will severely limit the cell growth, and ultimately lead to low expansion ratio and non-uniform cell morphology. [17][18][19] Third, the linear PLA generally possesses poor melt strength, which easily leads to cell collapse and gas loss, thereby restricting continuous foam expansion. [12] Fourth, the requirements of high expansion and Bio-based and biodegradable poly(lactic acid) (PLA) foams with a high expansion ratio show great application potential in oil-adsorption and thermal-insulation, which are crucial for oil-spill cleanup and energy saving. However, it is difficult to prepare high-expansion PLA foam due to the poor melt strength and complex crystallization behavior of PLA. Herein, super high-expansion PLA foams with excellent oil-adsorption and thermal-insulation properties are successfully prepared using a modified supercritical CO 2 foaming technology without introducin...

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming

Zhao

Wang

et al. 2021

Advanced Sustainable Systems

Self Cite

View full text Add to dashboard Cite

show abstract

“…[16][17][18][19][20] Supercritical carbon dioxide (sc-CO 2 ) foaming is a physical foaming method and a popular approach for producing porous materials because of the environmental friendliness, nontoxicity, rapid diffusion, and high solubility of CO 2 . [21][22][23][24] The foaming process consists of three stages: 1) at a set temperature and pressure, CO 2 is dissolved and diffused into the polymer to form a homogeneous polymer/gas system; 2) the system is then converted to a supersaturated state to induce nucleation by rapidly lowering the pressure or increasing the temperature; and 3) finally, the cell growth and fixed.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Glass Fiber/Poly(Ether Ether Ketone) Composite Foam with Improved Compressive Strength and Heat Resistance

Liang

Jiang

et al. 2022

Adv Eng Mater

View full text Add to dashboard Cite

Glass fiber/poly(ether ether ketone) (GF/PEEK) composite foams with improved compressive strength and heat resistance can be successfully prepared using a simple and environmentally friendly supercritical carbon dioxide (sc‐CO2) foaming technology. The cell morphologies of the foams can be controlled by adjusting the GF content and foaming parameters, including the saturation temperature, saturation time, saturation pressure, and depressurization rate. With a foam density of 0.55 g cm−3, the PEEK‐based composite foam having 30% GF content has a 10% compressive strength of 11.07 MPa, and its density varies negligibly up to 330.0 °C. The GF/PEEK composite foams having high GF contents show significantly better properties than those having low GF contents as a result of the supporting and strengthening effect of the GF in the PEEK cell walls. The GF/PEEK composite foams also show good corrosion resistance. As a result of these properties, the GF/PEEK composite foams are promising high‐performance materials for use in extreme environments.

show abstract

“…However, traditional physical blowing agents like chlorofluorocarbons (CFCs) and hydrofluorocarbons (HFCs) still exhibit environmental concern and hazardous properties. Recently, supercritical fluids, and particularly carbon dioxide (CO 2 ), have been developed as an alternate physical blowing agent in the foaming process, and have been used in preparation of polylactide (PLA), poly methyl methacrylate (PMMA) and polycaprolactone (PCL) foam [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Microcellular Foams by Supercritical Carbon Dioxide: A Case Study of Thermoplastic Polyurethane 70A

et al. 2021

View full text Add to dashboard Cite

In this study, a case study to produce microcellular foam of a commercial thermoplastic polyurethane (TPU) through the supercritical carbon dioxide (CO2) foaming process is presented. To explore the feasibility of TPU in medical device and biomedical application, a soft TPU with Shore hardness value of 70A was selected as the model compound. The effects of saturation temperature and saturation pressure ranging from 90 to 140 °C and 90 to 110 bar on the expansion ratio, cell size and cell density of the TPU foam were compared and discussed. Regarding the expansion ratio, the effect of saturation temperature was considerable and an intermediate saturation temperature of 100 °C was favorable to produce TPU microcellular foam with a high expansion ratio. On the other hand, the mean pore size and cell density of TPU foam can be efficiently manipulated by adjusting the saturation pressure. A high saturation pressure was beneficial to obtain TPU foam with small mean pore size and high cell density. This case study shows that the expansion ratio of TPU microcellular foam could be designed as high as 4.4. The cell size and cell density could be controlled within 12–40 μm and 5.0 × 107–1.3 × 109 cells/cm3, respectively.

show abstract

Biodegradable PLA/PBS open-cell foam fabricated by supercritical CO2 foaming for selective oil-adsorption

Cited by 83 publications

References 68 publications

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming

Preparation of Glass Fiber/Poly(Ether Ether Ketone) Composite Foam with Improved Compressive Strength and Heat Resistance

Preparation of Microcellular Foams by Supercritical Carbon Dioxide: A Case Study of Thermoplastic Polyurethane 70A

Contact Info

Product

Resources

About

Biodegradable PLA/PBS open-cell foam fabricated by supercritical CO2 foaming for selective oil-adsorption

Cited by 83 publications

References 68 publications

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO2 Foaming

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO2 Foaming

Preparation of Glass Fiber/Poly(Ether Ether Ketone) Composite Foam with Improved Compressive Strength and Heat Resistance

Preparation of Microcellular Foams by Supercritical Carbon Dioxide: A Case Study of Thermoplastic Polyurethane 70A

Contact Info

Product

Resources

About

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming

Super High‐Expansion Poly(Lactic Acid) Foams with Excellent Oil‐Adsorption and Thermal‐Insulation Properties Fabricated by Supercritical CO₂ Foaming