LDPE/MWCNT and LDPE/MWCNT/UHMWPE self-reinforced fiber-composite foams prepared via supercritical CO2: A microstructure-engineering property perspective

Aghvami‐Panah, Mohammad; Panahi‐Sarmad, Mahyar; Seraji, Amir Abbas; Jamalpour, Seifollah; Ghaffarian, Seyed Reza; Park, Chul

doi:10.1016/j.supflu.2021.105248

Cited by 24 publications

(18 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This improvement of cellular characteristics can be attributed to; (I) boosting the number of heterogeneous nucleation sites, (II) reducing in gas portion required for the growth of the smaller cells due to the absorbing a great deal of blowing agent into the matrix-fiber interface, and (III) preventing coalescence owing to the increment of melt strength. 21,36,54 As mentioned earlier, the final density of the foams could be completely controllable by the microwave radiation time. It is interesting to note that cellular morphology was stabilized without any further cooling process by turning off the microwave oven.…”

Section: Comparison With Conventional Foaming Methodsmentioning

confidence: 72%

“…By loading the fibers, cell density grows up from 6.15 × 10 8 cell/cm 3 for PS/CNT1/GF0 composite foam to 3.24 × 10 9 cell/cm 3 for the PS/CNT1/GF15. This improvement of cellular characteristics can be attributed to; (I) boosting the number of heterogeneous nucleation sites, (II) reducing in gas portion required for the growth of the smaller cells due to the absorbing a great deal of blowing agent into the matrix‐fiber interface, and (III) preventing coalescence owing to the increment of melt strength 21,36,54 …”

Section: Resultsmentioning

confidence: 99%

“…They found that by incorporating just 0.04 wt% CNTs, the microwave absorbance of the silicone oil increased by five 100-fold. The influence of CNTs concentration and dispersion level was investigated by Fan et al 20,21 They provided an in-depth analysis of CNTs showing their relevance to the absorbability of the matrix. Indeed, with the better dispersion and higher concentration of CNTs in the matrix, a higher absorption rate is achieved.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Shahbazi

Aghvami‐Panah

Panahi‐Sarmad

et al. 2022

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

In the current study, polystyrene/carbon nanotubes/glass fiber (PS/CNT/GF) hybrid foam with a bimodal cellular-structure has been fabricated via microwave heating as a novel energy source. Microwave-assisted (MA) samples not only demonstrated the lowest density as compared to traditional methods but also represented superior compressive mechanical properties. Since the bimodal morphology has not been seen so far, the role of selective microwave heating has been thoroughly investigated from the microstructural point of view. Accordingly, the amount of receiving microwave radiations to heat up the system is controllable via the CNTs (as nucleating agents and absorbers) as well as radiation time. Moreover, 1-15 wt% fibers were incorporated to enhance mechanical performance, which led to turning uniform cellular structure to the bimodal pattern, and its cell morphological was studied thereafter. Electrical conductivity and dielectric permittivity properties have not been deprived of bimodality benefits which have been rigorously proven.

show abstract

Section: Comparison With Conventional Foaming Methodsmentioning

confidence: 72%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Shahbazi

Aghvami‐Panah

Panahi‐Sarmad

et al. 2022

J of Applied Polymer Sci

Self Cite

View full text Add to dashboard Cite

show abstract

“…Both the UHMWPE fiber and MWCNTs were chemically treated with glycidyl methacrylate (GMA) and amino-thiol end radicals via free radical polymerization and click chemistry, respectively, to produce a high level of compatibility with epoxy matrix. LDPE/MWCNT and LDPE/MWCNT/UHMWPE self-reinforced fiber-composite were invented by M.A.A Seraji et al [ 130 ] to improve the physical properties of UHMWPE. A novel nanocomposite coating of UHMWPE reinforced with nano clay and C nanotubes was developed to improve tribological properties of UHMWPE.…”

Section: Methodologies For Surface Modification Of Uhmwpementioning

confidence: 99%

Functional Ultra-High Molecular Weight Polyethylene Composites for Ligament Reconstructions and Their Targeted Applications in the Restoration of the Anterior Cruciate Ligament

et al. 2022

View full text Add to dashboard Cite

The selection of biomaterials as biomedical implants is a significant challenge. Ultra-high molecular weight polyethylene (UHMWPE) and composites of such kind have been extensively used in medical implants, notably in the bearings of the hip, knee, and other joint prostheses, owing to its biocompatibility and high wear resistance. For the Anterior Cruciate Ligament (ACL) graft, synthetic UHMWPE is an ideal candidate due to its biocompatibility and extremely high tensile strength. However, significant problems are observed in UHMWPE based implants, such as wear debris and oxidative degradation. To resolve the issue of wear and to enhance the life of UHMWPE as an implant, in recent years, this field has witnessed numerous innovative methodologies such as biofunctionalization or high temperature melting of UHMWPE to enhance its toughness and strength. The surface functionalization/modification/treatment of UHMWPE is very challenging as it requires optimizing many variables, such as surface tension and wettability, active functional groups on the surface, irradiation, and protein immobilization to successfully improve the mechanical properties of UHMWPE and reduce or eliminate the wear or osteolysis of the UHMWPE implant. Despite these difficulties, several surface roughening, functionalization, and irradiation processing technologies have been developed and applied in the recent past. The basic research and direct industrial applications of such material improvement technology are very significant, as evidenced by the significant number of published papers and patents. However, the available literature on research methodology and techniques related to material property enhancement and protection from wear of UHMWPE is disseminated, and there is a lack of a comprehensive source for the research community to access information on the subject matter. Here we provide an overview of recent developments and core challenges in the surface modification/functionalization/irradiation of UHMWPE and apply these findings to the case study of UHMWPE for ACL repair.

show abstract

“…Another alternative is the use of the heterogeneous nucleation approach, [16][17][18][19][20][21] which consists of adding a second phase into the polymer with the aim to control the nucleation. By using this approximation the nucleation energy barrier suffers a significant reduction in the polymer-particle interphase, and gas molecules will be preferably located in the particle surroundings during the nucleation process.…”

Section: Introductionmentioning

confidence: 99%

Microcellular foams production from nanocomposites based on PS using MOF nanoparticles with enhanced CO₂ properties as nucleating agent

Cuadra-Rodriguez

Barroso‐Solares

et al. 2022

Journal of Cellular Plastics

View full text Add to dashboard Cite

The use of metal-organic frameworks (MOF) nanoparticles as nucleating agents in gas dissolution foaming processes is presented. In this work, MOF nanoparticles with three different particle sizes were synthetized and introduced in film composites based on polystyrene at 1 wt.%. The addition of nanoparticles with high affinity to CO2, which is the gas used as a physical blowing agent, can contribute to increase the nucleation efficiency in comparison with the classical heterogeneous route using non CO2-philic particles. Nanoparticles dispersion in solids and cellular structure in foams were studied as a function of the particle size and foaming parameters, studying for first time the impact of MOF nanoparticles on the nucleation by gas dissolution foaming. Nucleation efficiencies in the order of 10−2 were achieved for PS/MOF composites. In addition, the thermal stability of the cellular structure in the composites was enhanced regarding to PS matrix, preserving the cellular structure regardless the foaming temperature. Therefore, MOF nanoparticles have emerged as promising nucleating agents in foaming procedures.

show abstract

LDPE/MWCNT and LDPE/MWCNT/UHMWPE self-reinforced fiber-composite foams prepared via supercritical CO2: A microstructure-engineering property perspective

Cited by 24 publications

References 58 publications

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Functional Ultra-High Molecular Weight Polyethylene Composites for Ligament Reconstructions and Their Targeted Applications in the Restoration of the Anterior Cruciate Ligament

Microcellular foams production from nanocomposites based on PS using MOF nanoparticles with enhanced CO₂ properties as nucleating agent

Contact Info

Product

Resources

About

LDPE/MWCNT and LDPE/MWCNT/UHMWPE self-reinforced fiber-composite foams prepared via supercritical CO2: A microstructure-engineering property perspective

Cited by 24 publications

References 58 publications

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Fabricating bimodal microcellular structure in polystyrene/carbon nanotube/glass‐fiber hybrid nanocomposite foam by microwave‐assisted heating: A proof‐of‐concept study

Functional Ultra-High Molecular Weight Polyethylene Composites for Ligament Reconstructions and Their Targeted Applications in the Restoration of the Anterior Cruciate Ligament

Microcellular foams production from nanocomposites based on PS using MOF nanoparticles with enhanced CO2 properties as nucleating agent

Contact Info

Product

Resources

About

Microcellular foams production from nanocomposites based on PS using MOF nanoparticles with enhanced CO₂ properties as nucleating agent