An analytical investigation on the effect of porous conductive cellulose acetate composite morphology on the detection of organic compounds

Noormohammad, Asma; Molla-Abbasi, Payam

doi:10.1002/pen.25407

Cited by 5 publications

(6 citation statements)

References 49 publications

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“…As a result, during the casting process, vapor-induced phase separation (VIPS) occurred at the PLA surface and caused the formation of these small holes on the surface of the prepared film. [45][46][47] As seen in Figure 3C,D, the L50E50 has a cocontinuous morphology.…”

Section: Fesemmentioning

confidence: 92%

Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

Attari,

Molla‐Abbasi,

Rashidzadeh

2024

Polymer Engineering & Sci

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Today, the use of biodegradable polymers has become widespread in a wide range of industries. This research scrutinized the physical, mechanical, and rheological properties of poly (lactic acid)/poly (ethylene oxide)/carbon nanotube (PLA/PEO/CNTs) blend nanocomposites, as a good candidate for usage in the packaging industry. PEO and CNTs were added at various concentrations to improve the flexibility, toughness, gas permeability, thermal stability, and mechanical properties of PLA via solution blending. Differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), Field Emission Scanning Electron Microscope (FESEM), water contact angle (WCA), rheometric mechanical spectrometer (RMS) test, gas permeability, and tensile characterization were performed to characterize the properties of the prepared blends and nanocomposites. The experimental results revealed that the addition of 25 wt% PEO to the PLA matrix made a partially miscible blend with a droplet‐matrix morphology. PEO at this concentration increased the elongation at break (from 2.2% to 18%) while reducing the modulus (from 25 to 6 MPa). Also, the experimental results indicated that the miscibility of PLA and PEO was enhanced by the addition of 1 wt% CNTs to the prepared blend, associated with diminished entropy of mixing in the LCST phase diagram. Theoretical calculations predicted that the CNTs would be localized in the PLA phase which increased the total crystallinity of the sample by 28%, considerably reducing the amount of gas permeation into the nanocomposite. In addition, the introduction of the CNTs to the blend increased the elongation at break and tensile strength by 13% compared to pure PLA and lowered the rate of thermal degradation effectively. Also, the final results showed that the COOH‐CNTs located in the PEO phase caused a decline in the crystallinity and an increase in the gas permeability of the prepared nanocomposite.Highlights Improvement of physical properties of PLA by blending with PEO and CNTs. A deep investigation on rheological behavior of the prepared nanocomposite. Increasing the crystallinity degree of PLA/PEO blend by adding CNTs. Improvement of the miscibility between PLA and PEO in the presence of CNTs. Controlling the CNTs localization by surface modification.

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Section: Fesemmentioning

confidence: 92%

Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

Attari,

Molla‐Abbasi,

Rashidzadeh

2024

Polymer Engineering & Sci

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“…A 5‐μl droplet of the filtered solution was dropped on the gold interdigitated electrode substrate (IDEAU10, dropsens) that preheated at 40°C, leading to the formation of a thin film. Finally, the prepared layer was kept in a vacuum oven for 24 h to remove any residual solvent molecules 3,23 …”

Section: Methodsmentioning

confidence: 99%

“…The response characteristics of the conductive composites were investigated by a homemade vapor generation and resistance measurement system setup 1,3 . The designed setup consists of a glass vessel equipped with a fan and a heater to prepare the target analytes in the exact concentrations.…”

Section: Methodsmentioning

confidence: 99%

“…Conductive polymer composite (CPC) sensitive layers are widely used to detect volatile organic compounds (VOCs) 1,2 . VOCs detection plays crucial roles in human health, 3 environmental monitoring, 4 hazardous chemicals detection, 5 and so on. The CPCs detecting performance is based on the interaction between polymer matrix and gas target molecules (analytes) that makes reversible interruptions in the 3D conductive network of the composite and consequently causes the increasing the resistance of the prepared sensitive layers 6 .…”

Section: Introductionmentioning

confidence: 99%

“…In our previous study, the sensitivity of porous cellulose acetate /MWNT sensitive layer against some stimuli such as water vapor, methanol, isopropyl alcohol, ethanol, and acetone was reported. The response trend was explained based on the thermodynamic parameters such as the FH interaction parameter, the interaction parameter (g 12 ), and solubility parameters of mentioned molecules 3 . Kumar et al reported the response of conductive biopolymer (chitosan‐CNT) transducer against methanol, water, and toluene.…”

Section: Introductionmentioning

confidence: 99%

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Organic compound gas detector based on polylactic acid/poly (styrene‐co‐acrylonitrile)/multi‐walled carbon nanotube blend composite with co‐continuous microstructure

Molla-Abbasi

2021

Polymers for Advanced Techs

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A conductive polymer composite (CPC) based on polylactic acid (PLA)/poly (styrene‐co‐acrylonitrile) (SAN)/multi‐walled carbon nanotubes (MWNT) blend was prepared and used as a sensitive layer for detecting methanol, ethanol, toluene, and water vapor. The response behavior of polymer blend nanocomposite in comparison with PLA‐MWNT and SAN‐MWNT sensitive layers was studied as well as the influence of solution blending on the morphology, electrical behavior, and performance parameters of prepared sensitive layers. The scanning electron microscopy micrograph results showed that the PLA/SAN solution blended with a 50/50 wt% ratio had formed the co‐continuous morphology. In addition, the electrical conductivity investigation revealed that the percolation threshold of sensitive layers decreased from 1.5 vol%, related to PLA‐MWNT, to 0.8 vol%, related PLA/SAN blend nanocomposite. Thermodynamic investigation revealed that, in the solution blended conductive composites, MWNTs are preferentially localized in the PLA phase. The relative response (Rrel) of blended conductive composite, in comparison with PLA‐MWNT, was increased toward ethanol and toluene vapor while it was decreased against the methanol vapor. The sensitivity behavior of polymer blend composite was investigated based on the double percolated conductive network as well as the thermodynamic parameters such as Flory‐Huggins interaction parameter and solubility parameters.

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Highly compressible porous polyethyleneimine/chitosan composite aerogel with excellent mechanical properties as wide detection range sensors for human motion monitoring

Sun,

Yang,

Chen

et al. 2024

J of Applied Polymer Sci

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Biomass three‐dimensional composite aerogels have garnered significant attention in the realm of wearable electronic skin owing to their favorable properties, including excellent human compatibility, environmentally benign degradability, and continuous porous architecture. However, conventional biomass aerogels suffer from inadequate mechanical flexibility, susceptibility to irreversible deformation under high compressive stress, and limited reusability, thereby constraining their applicability in sensing technologies. To address these limitations, this study presents the development of porous CCS/KH560/PEI/CNT‐COOH (CKPC) composite aerogels through a freeze–drying process. Chemical crosslinking was achieved using silane coupling agent (KH560) with carboxymethyl chitosan (CCS) and polyethyleneimine (PEI), while carboxylated carbon nanotubes (CNT‐COOH) were incorporated as conductive fillers. This approach successfully overcame the issues of poor mechanical properties, low elasticity, and unbalanced sensitivity‐sensing range trade‐off in chitosan‐based aerogel sensors. The results revealed that the porous CKPC aerogels exhibited a remarkable mechanical compressive strain of 86.3% while maintaining structural integrity post‐unloading. The CKPC composite aerogel‐based sensor demonstrated a high sensitivity of 42.9 within a wide strain range of 60%–76.3%, accompanied by a stable and repeatable electrical signal response across varying strains. The porous structure of the CKPC conductive aerogel sensor holds promising applications in human motion monitoring and flexible electronics.

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An analytical investigation on the effect of porous conductive cellulose acetate composite morphology on the detection of organic compounds

Cited by 5 publications

References 49 publications

Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

Fabrication of a packaging film based on PLA blends: The evolution of physical, mechanical, and rheological properties

Organic compound gas detector based on polylactic acid/poly (styrene‐co‐acrylonitrile)/multi‐walled carbon nanotube blend composite with co‐continuous microstructure

Highly compressible porous polyethyleneimine/chitosan composite aerogel with excellent mechanical properties as wide detection range sensors for human motion monitoring

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