Evaluation of poly(2-hydroxyethyl methacrylate) and poly(methyl methacrylate)-grafted poly(vinylidene fluoride)-poly(dimethylsiloxane) bilayers for gas separation

Maher, Behnaz Memar; Rezaali, J.; Ghaleh, Hakimeh; Fallahnejad, S.; Abbasi, Farhang; Babaluo, Ali Akbar

doi:10.1007/s00396-017-4124-7

Cited by 8 publications

(4 citation statements)

References 55 publications

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“…carbon black is added to improve electrical conductivity, titanium dioxide improves dielectric constants, and barium sulfate improves radio‐opacity. Due to high modifiability, polysiloxanes are widely used in an immense number of industrial applications, 7,92 varying from simple baking and measuring cups, 93,94 to surface modifiers (elastomers/sealants, antifoaming agents, personal care products, surfactants, coatings, insulations), 31,34,50,57,88,95–99 biomedical, 9,28,32,75,85,100–109 microporous organic and inorganic materials, 110,111 aerospace and other high tech industries 112–114 . This mini‐review will outline the basic methods of siloxane degradation/depolymerization broken down by mechanism and technique that have been investigated throughout the development of the siloxane polymer field.…”

Section: Introductionmentioning

confidence: 99%

Degradation of silicone‐based materials as a driving force for recyclability

Rupasinghe

Furgal

2021

Polymer International

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Siloxane polymers are an important industrial commodity based on the structure –(R2–Si–O)–. Scission of the siloxane bond is essential, as it is the first step leading to polymerization or the depolymerization of polymers into smaller units for potential recycling. These highly condition‐specific reactions selectively trigger whether polymerization or breakdowns occur and have been extensively studied over the past 80 years. However, studies to recycle siloxanes are still in their infancy. Traditional methods to synthesize silicones involve high capital‐intensive and environmental costs using carbothermal reduction. These reactions cause the excessive release of global warming gases such as CO2 and other pollutants into the environment. Therefore, being able to reuse and recycle them in a meaningful manner is highly sought. As a result, ways to controllably rupture the siloxane bond into known products have been a goal of siloxane researchers since the 1950s. Hydrolysis, catalytic depolymerization, thermal depolymerization and radical extractions are the main approaches to imbue the scission of the siloxane bond, resulting in a slew of products, including new polymers, cyclics or monomeric silanes. The present review summarizes the available published data on the degradation and depolymerization of polysiloxanes published up to July 2021. © 2021 Society of Industrial Chemistry.

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Section: Introductionmentioning

confidence: 99%

Degradation of silicone‐based materials as a driving force for recyclability

Rupasinghe

Furgal

2021

Polymer International

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“…Different dense and porous membranes can be used as gas separators [3,4]. The e ciency of a gas separation membrane depends on the type of material (polymeric or nonpolymeric) [5][6][7][8][9], structure [9][10][11][12][13][14], and morphology [15,16,17]. Most polymers lack properties such as low-temperature exibility, air absorption, and fatigue resistance and do not perform well in different temperature conditions.…”

Section: Introductionmentioning

confidence: 99%

The relationship between chemical microstructure, crystallinity, mechanical properties, and CO2/N2 gases permselectivity of thermoplastic polyurethane membranes

Abedi,

Maher,

Amirkhani

et al. 2024

Colloid Polym Sci

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In this study, thermoplastic polyurethane (TPU) with 30%wt hard segment content (HSC) was synthesized using isophorone diisocyanate (IPDI), 1, 4-butanediol (BDO) as the chain extender, and polycaprolactone (PCL) with three different molecular weights (2000, 4000, and 10000) as polyols. Fourier-transform infrared spectroscopy (FTIR), hydrogen nuclear magnetic resonance (H-NMR), X-ray diffraction (XRD), and differential scanning calorimetry (DSC) analysis were used to evaluate the chemical microstructure and physical characteristics of polycaprolactones (PCLs) and thermoplastic polyurethanes (TPUs). The results showed that the crystallinity and the glass transition temperature (Tg) of TPUs became different depending on the molecular weight of the PCL soft segments. A tensile strength was used to evaluate the mechanical properties of TPUs. It was observed that increasing the molecular weight of PCL decreased the elongation at break and increased the ultimate tensile strength. The permeability of CO 2 and N 2 gase over wide ranges of pressure (3 to 9 atm) was examined, and the permselectivity of the membranes was determined. It was concluded that an increase in the feeding gas pressure led to an increase in the gas permeability of all samples. It was observed that in TPU samples, the increase in the molecular weight of PCLs led to a decrement in selectivity and an increase in permeability of CO 2 and N 2 gas.

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“…This has attracted much attention to graft polymerization of HEMA for tethering PHEMA on the surface of membranes. Nevertheless, the capability of such thick films is constrained in practical commercial and industrial applications due to their low flux and weak mechanical resistance [21].…”

Section: Introductionmentioning

confidence: 99%

Radiation‐Induced Admicellar Graft Polymerization of 2‐Hydroxyethyl Methacrylate onto Polyvinylidene Fluoride Membranes Using an Electron Beam Accelerator

Azzian,

Mohamad,

Abd Rahim

et al. 2023

Chem Eng & Technol

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The efficiency of admicellar graft polymerization in functionalizing polyvinylidene fluoride (PVDF) membranes was explored. The effect of 2‐hydroxyethyl methacrylate (HEMA) concentration and the absorbed dose was investigated using a simultaneous method of radiation‐induced graft polymerization. The degree of grafting increased with raising the absorbed dose and HEMA concentration. The Fourier transform infrared (FTIR) peak for C–O stretch and the asymmetric and symmetric stretching of the C–O–C bridge, respectively, proved the presence of poly(2‐hydroxyethyl methacrylate) (PHEMA) on the modified PVDF. As the grafting yield increased, rougher surfaces were observed. According to contact angle analysis, the grafted membrane with a higher grafting yield outperformed the low grafting yield membrane in terms of water flux and hydrophilicity.

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Evaluation of poly(2-hydroxyethyl methacrylate) and poly(methyl methacrylate)-grafted poly(vinylidene fluoride)-poly(dimethylsiloxane) bilayers for gas separation

Cited by 8 publications

References 55 publications

Degradation of silicone‐based materials as a driving force for recyclability

Degradation of silicone‐based materials as a driving force for recyclability

The relationship between chemical microstructure, crystallinity, mechanical properties, and CO2/N2 gases permselectivity of thermoplastic polyurethane membranes

Radiation‐Induced Admicellar Graft Polymerization of 2‐Hydroxyethyl Methacrylate onto Polyvinylidene Fluoride Membranes Using an Electron Beam Accelerator

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