Water sorption and diffusion through saturated polyester and their nanocomposites synthesized from glycolyzed PET waste with varied composition

Katoch, Sunain; Sharma, Vinay; Kundu, Patit Paban

doi:10.1016/j.ces.2010.03.050

Cited by 18 publications

(13 citation statements)

References 47 publications

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“…deionized water or salt solution), covered and periodically removed and weighed [11][12][13][14][15][16]. This was used to measure the rate at which the solution was absorbed by the polymer, as well as the diffusivity coefficient, D. Eight pieces of the polymer tube of length 14.7 cm, amounting to a total average surface area of 850 cm 2 , were inserted in a bottle and immersed in an excess of solvent.…”

Section: Sorption Testsmentioning

confidence: 99%

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

Sule

Jiang

Templeton

et al. 2013

Environmental Technology

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The performance of a hydrophilic polyester tubular pervaporative membrane in treating high-salinity water for irrigation was investigated. The membrane was filled with contaminated water and placed in air, soil or sand media. When this occurs water diffuses through the tube, trapping salts within the tube. Sorption and permeation tests and scanning electron microscopy (SEM) were used to assess salt rejection and permeate flux through the tubular membrane when surrounded by deionized water, air, top soil or silver sand. Mean water uptake by the membrane was 0.5 L x m(-2) at room temperature and the water diffusion coefficient was 3.8 x 10(-4) cm2 x s(-1). The permeate flux across the membrane was 7.9 x 10(-3) L(m(-2) x h(-1)) in sand and 5.6 x 10(-2) in air. The rejection of sodium chloride by the tubular membrane in sand was 99.8% or above under all tested conditions. However, when the tube was filled with sodium chloride solution and placed in deionized water, salt was observed to permeate the membrane. SEM images confirmed that variable amounts of sodium chloride crystals were retained inside the membrane walls. These results support the potential application of such a tubular pervaporative membrane for irrigation applications using saline waters; however there may be reduced salt rejection under waterlogged soil conditions.

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Section: Sorption Testsmentioning

confidence: 99%

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

Sule

Jiang

Templeton

et al. 2013

Environmental Technology

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“…An intermediate state between diffusion and relaxation occurs when 0.5 < n < 1 [47][48][49]. However, all hydrogels showed n<0.5, which indicates a pseudo-Fickian behavior.…”

Section: Studies Of Water Transportmentioning

confidence: 81%

Synthesis and characterization of a pH-responsive poly(ethylene glycol)-based hydrogel: acid degradation, equilibrium swelling, and absorption kinetic characteristics

et al. 2015

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We developed a pH-responsive, hydrogel based on poly(ethylene glycol) (PEG) covalently cross-linked with acrylic acid and N′,N′-dimethylacrylamide along with acidlabile groups. In the hydrogel, PEG plays a role as the key constituent. If its chains break, the polymer networks are destroyed. The pharmacological potential of these hydrogels were demonstrated by determining their water transport profile, modulus of elasticity, and cytotoxicity assay. The hydrogels showed a pseudo-Fickian behavior, a transport mechanism that occurs when the diffusion coefficient changes with the time and the swelling equilibrium is never fully reached. At pH 2, the PEG-richer hydrogels degraded and the scanning electron microscopy (SEM) images illustrated less-defined shapes than at pH 7 and 10. This morphological characteristic results of the hydrogel deconstruction owing to cleavage of ether bonds of the PEG chains unmaking its 3D polymer network. The proposed hydrogels were shown to be compatible to cells, indicating acceptable biocompatibility and an appropriate level of security for use in the biological environments. Furthermore, they showed structural changes in their polymer network in response to pH, which is an important characteristic for stimuli-triggered release of guest molecules.

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“…The results of the sorption process are expressed as moles of solvent absorbed by 100 g of unsaturated polyester (UP); Q t ) at each time interval, and it was calculated using the equation [16]: where M s is the mass of solvent absorbed at time t (minute), M r is the relative molecular mass of the solvent, and M p is the mass of the dry sample. At equilibrium swelling, Q t was taken as Q ∞ , mole percent uptake at infinite time.…”

Section: Resultsmentioning

confidence: 99%

Palm oil‐based unsaturated polyester: Activation energy and swelling properties

Lai

Rozman

Tay

2012

Polymer Engineering & Sci

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In this study, unsaturated polyester (UP) resin based on palm oil was synthesized. Palm oil monoglyceride (POMG) was obtained by alchoholysis process of palm oil at 230°C for 3 h. Then, POMG was treated with maleic anhydride (MA) at different ratio of POMG:MA to produce UP resin. The products were then characterized using Fourier transform infrared (FTIR) spectrometer and proton nuclear magnetic resonance (1H‐NMR) spectrometer. FTIR and 1H‐NMR spectrum analyses confirmed that the unsaturated group of MA was chemically attached to POMG. The activation energy of POMG/MA reaction was also studied. The results showed that the ratio of reactants and the presence of 2‐methylimidazole influenced the activation energy of reaction. The prepared UP resin was mixed with 35% of styrene, 0.3% of cobalt naphthenate, and 1% of methyl ethyl ketone peroxide before it was subjected to curing process. The effect of POMG/MG ratio on swelling properties of the cured UP was studied, and the result indicated that toluene and cured UP resin were compatible. POLYM. ENG. SCI., 2013. © 2012 Society of Plastics Engineers

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Water sorption and diffusion through saturated polyester and their nanocomposites synthesized from glycolyzed PET waste with varied composition

Cited by 18 publications

References 47 publications

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

Salt rejection and water flux through a tubular pervaporative polymer membrane designed for irrigation applications

Synthesis and characterization of a pH-responsive poly(ethylene glycol)-based hydrogel: acid degradation, equilibrium swelling, and absorption kinetic characteristics

Palm oil‐based unsaturated polyester: Activation energy and swelling properties

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