An approach of balancing the ionic conductivity and mechanical properties of PVA based nanocomposite membrane for DMFC by various crosslinking agents with ionic liquid

Kakati, Nitul; Maiti, Jatindranath; Das, Gautam; Lee, Seok Hee; Yoon, Young Soo

doi:10.1016/j.ijhydene.2015.04.004

Cited by 48 publications

(31 citation statements)

References 45 publications

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“…3, PVA presented a maximum degradation around 350 °C corresponding to 60% of mass loss and another maximum around 450°C, attributed to the decomposition of the rest of the material, remaining 5% of residue at 600°C. Pristine PVA exhibits more than one region of weight loss as described by other authors (Kakati et al, 2015;Yang et al, 2009).…”

Section: Resultssupporting

confidence: 61%

SYNTHESIS, CHARACTERIZATION AND in vitro CYTOTOXICITY OF Acacia mearnsii PROANTHOCYANIDIN LOADED PLGA MICROPARTICLES

Grasel

Behrens

Strassburger

et al. 2019

Braz. J. Chem. Eng.

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One of the highlighted areas in the development of new materials is the generation of micro-and nanoparticles as drug carriers which allow the progress in formulations with the ability to release active agents in a controlled way. The proanthocyanidins (PAC) extracted from the bark of the Black Wattle have stood out for their biological activities. However, most polyflavonoids have some features which limit their application in the pharmaceutical field, such as light fastness, low bioavailability of active agents, and unpleasant taste. In this context, this study aims to present the synthesis and characterization of PAC-loaded lactic-co-glycolic acid (PLGA) microparticles obtained by the multiple emulsion method. The incorporation of PAC into PLGA was successfully achieved with PAC encapsulation efficiency around 73%. Spherical microparticles were obtained with a size distribution in the range of 0.6 to 2.4 μm. The presence of PAC modified the thermal properties of the PLGA matrix. The results of in vitro assays with Vero and T24 lineage celss showed that PLGA/PAC microparticles did not promote any effect on cell proliferation by MTT assay after 24 h. The novel Acacia mearnsii proanthocyanidin-loaded PLGA microparticles have potential for application in biological systems.

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Section: Resultssupporting

confidence: 61%

SYNTHESIS, CHARACTERIZATION AND in vitro CYTOTOXICITY OF Acacia mearnsii PROANTHOCYANIDIN LOADED PLGA MICROPARTICLES

Grasel

Behrens

Strassburger

et al. 2019

Braz. J. Chem. Eng.

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“…The stretching vibration of the O‒H bond of the carboxyl groups appeared between 2500 and 3000 cm −1 . In addition, an increase in the peak intensity of the 1040 cm −1 signal associated with the stretching of the sulfonic groups (‒SO 3 H) was perceived [58]. After crosslinking, the intensity of the stretching vibration signal of the –OH group of the PVA molecules was reduced, given its reaction with the carboxyl group of the SSA molecules [50].…”

Section: Resultsmentioning

confidence: 99%

Crosslinked Sulfonated Poly(vinyl alcohol)/Graphene Oxide Electrospun Nanofibers as Polyelectrolytes

et al. 2019

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Taking advantage of the high functionalization capacity of poly(vinyl alcohol) (PVA), bead-free homogeneous nanofibrous mats were produced. The addition of functional groups by means of grafting strategies such as the sulfonation and the addition of nanoparticles such as graphene oxide (GO) were considered to bring new features to PVA. Two series of sulfonated and nonsulfonated composite nanofibers, with different compositions of GO, were prepared by electrospinning. The use of sulfosuccinic acid (SSA) allowed crosslinked and functionalized mats with controlled size and morphology to be obtained. The functionalization of the main chain of the PVA and the determination of the optimum composition of GO were analyzed in terms of the nanofibrous morphology, the chemical structure, the thermal properties, and conductivity. The crosslinking and the sulfonation treatment decreased the average fiber diameter of the nanofibers, which were electrical insulators regardless of the composition. The addition of small amounts of GO contributed to the retention of humidity, which significantly increased the proton conductivity. Although the single sulfonation of the polymer matrix produced a decrease in the proton conductivity, the combination of the sulfonation, the crosslinking, and the addition of GO enhanced the proton conductivity. The proposed nanofibers can be considered as good candidates for being exploited as valuable components for ionic polyelectrolyte membranes.

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“…Typical crosslinkers of PVA membranes include carboxylic acids and their analogs, various aldehydes, alkoxysilanes, and other chemical crosslinking agents . Among them, carboxylic acids and their analogs have drawn great attention in the past decades as PVA crosslinkers, which can be realized via an esterification reaction.…”

Section: Introductionmentioning

confidence: 99%

Properties and pervaporation performance of poly(vinyl alcohol) membranes crosslinked with various dianhydrides

Shen

et al. 2018

J of Applied Polymer Sci

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In this work, three dianhydrides with similar chemical structures, 3,3 0 ,4,4 0 -benzophenone tetracarboxylic dianhydride (BTDA), 4,4 0 -oxydiphthalic anhydride (ODPA), and pyromellitic dianhydride (PMDA), are employed for the crosslinking modification of poly(vinyl alcohol) (PVA) membranes for ethanol dehydration via pervaporation. The changes in crosslinking degree, surface hydrophilicity, and glass-transition temperature are investigated and compared. Compared to the pure PVA membrane, all crosslinked membranes show higher fluxes but lower separation factors, because of the higher fractional free volume and the lower hydrophilicity by the crosslinking of the PVA matrix, respectively. In addition, all crosslinked PVA membranes exhibit similar flux, and the separation factor presents a decreasing order of PVA/PMDA-2 > PVA/ODPA-2 > PVA/BTDA-2, which is in the reverse order of their hydrophilicity, probably because of the reduction in the swelling resistance. With the PMDA content increasing from 0.01 to 0.04 mol/(kg PVA) in the PVA/PMDA crosslinked membranes, the crosslinking degree is enhanced and the hydrogen bonding is weakened, resulting in a flux increase from 120.2 to 190.8 g m 22 h 21 , but the separation factor declines from 306 to 58. This work is believed to provide useful insight on the chemical modification of PVA membranes for pervaporation and other membrane-based separation applications.

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An approach of balancing the ionic conductivity and mechanical properties of PVA based nanocomposite membrane for DMFC by various crosslinking agents with ionic liquid

Cited by 48 publications

References 45 publications

SYNTHESIS, CHARACTERIZATION AND in vitro CYTOTOXICITY OF Acacia mearnsii PROANTHOCYANIDIN LOADED PLGA MICROPARTICLES

SYNTHESIS, CHARACTERIZATION AND in vitro CYTOTOXICITY OF Acacia mearnsii PROANTHOCYANIDIN LOADED PLGA MICROPARTICLES

Crosslinked Sulfonated Poly(vinyl alcohol)/Graphene Oxide Electrospun Nanofibers as Polyelectrolytes

Properties and pervaporation performance of poly(vinyl alcohol) membranes crosslinked with various dianhydrides

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