Thermal degradation behavior and kinetic studies of polyacrylamide gel in TiO2 nanoparticles synthesis

Rakhshani, Masoud; Kamrannejad, Mohammad Mehdi; Babaluo, Ali Akbar; Rezaei, Mehran; Aghjeh, Mirkarim Razavi

doi:10.1007/s13726-012-0086-2

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…The diffractogram of PAM showed mild crystalline structure with one characteristic peak at 2 θ = 30° whereas PAM‐ co ‐NaPA showed a crystalline structure with characteristics peaks at 2 θ = 30°, 36°, 40°, 43°, 48°, and 49° due to hydrolysis of PAM to polyacrylic acid, Anionic charges due to carboxylic groups result in alignment of polymeric chains and thus crystallinity observed due to repulsion between negative charges. Similar results have also been reported in the literature …”

Section: Resultssupporting

confidence: 93%

Preparation of hydrogel impregnated antimicrobial polyurethane foam for absorption of radionuclide contaminated blood and biological fluids

Kaur

Chattopadhyay

Jain

et al. 2016

J of Applied Polymer Sci

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Multi-purpose polyacrylamide (PAM) and polyacrylamide-co-sodiumpolyacrylate (PAM-co-NaPA) impregnated polyurethane foams (PUF) loaded with iodine have been prepared by in situ free radical polymerization. The prepared hydrogel networks displayed higher capacity for absorbing biological fluids as compared to regular PUF sheets and cotton matrices used in hospitals for maintaining hygiene conditions in cases of blood spillage and leakages. PAM-impregnated-PUF showed 910, 605, and 172% absorption in water, saline, and blood, respectively, whereas PAM-co-NaPA-impregnated-PUF showed absorption of 1545, 1395, and 269% in water, saline, and blood, respectively in 24 h. Exposure to nuclear, biological, and chemical (NBC) environment has become a grave predicament in today's world necessitating prevention of radiological contaminations especially in medical facilities. PAM-coNaPA-impregnated-PUF displayed 97% absorption of Tc 99 from whole blood whereas PUF sheets were highly hydrophobic and showed only 1% absorption of Tc 99 from whole blood. It was also demonstrated that modified foams have long-term broad-spectrum antimicrobial properties due to sustain release of ionic iodine. Thus, PAM-co-NaPA-impregnated-PUF sheets have strong potential to be used as matrices for carrying the injured patients, from field conditions to hospitals expose to NBC environment.

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Section: Resultssupporting

confidence: 93%

Preparation of hydrogel impregnated antimicrobial polyurethane foam for absorption of radionuclide contaminated blood and biological fluids

Kaur

Chattopadhyay

Jain

et al. 2016

J of Applied Polymer Sci

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“…PVC (Bandar Imam Petro, Iran) ( K value 64–66) as polymer matrix, two different titanium dioxide (TiO 2 ): commercial rutile particles (Mapa‐Trans, Ukraine) and homemade carbon‐coated rutile nanoparticles as UV absorbers, calcium carbonate (CaCO 3 ) (Poodrkar, Iran) as filler, chlorinated polyethylene (CPE) (Poodrkar, Iran) as impact modifier, calcium stearate (CaSt 2 ) and zinc stearate (ZnSt 2 ) (Poodrkar, Iran) as thermal stabilizer, paraffin wax (Poodrkar, Iran) as internal lubricant, and stearic acid (StAc) (EPS IMPEX, Malaysia) as external lubricant were used to prepare PVC nanocomposite compounds.…”

Section: Methodsmentioning

confidence: 99%

Effects of carbon‐coated titanium dioxide nanoparticles as a photostabilizer on the photodegradation of rigid poly(vinyl chloride)

Sokhandani

Abdi

Mehmandoust

et al. 2013

J of Applied Polymer Sci

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In this study, nanocomposites of rigid poly(vinyl chloride) (UPVC) using the synthesized carbon-coated titanium dioxide (TiO 2 ) nanoparticles and commercial powder of titanium dioxide (with rutile structure) were prepared by melt blending. The presence of carbon-coated TiO 2 nanoparticles with rutile structure in UPVC matrix led to an improvement in photo stability of UPVC nanocomposites in comparison with commercial UPVC. The photocatalytic degradation behavior of nanocomposites was investigated by measuring their structural changes, surface tension, and mechanical and morphological properties before and after UV exposure for 700 h. It was found that mechanical and physical properties of UPVC nanocomposites are not considerably reduced after UV exposure in the presence of carbon-coated TiO 2 nanoparticles even in small percentage of nanoparticles in comparison with the presence of commercial TiO 2 particles. Therefore, it can be concluded that UPVC/TiO 2 nanocomposite with low content of carboncoated TiO 2 nanoparticles(0.25 wt %) illustrated high stability under light exposure.

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“…Investigating the degradation of the polymers is of importance in understanding their processing, application, and thermal recycling. The common methods of polymer degradation are bio-, photo-oxidative, ozone-induced, mechanochemical, thermal and catalytic degradations [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

The Synthesis of Allyl Glycidyl Ether Copolymers and Their Thermokinetic Analysis

Yıldırım

2016

AUBTD-A

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The copolymerization reactions of allyl glycidyl ether (AGE) by radicalic polymerization under argon atmosphere using benzoyl peroxide (BPO) as an initiator with the comonomers of allyl methacrylate (AMA) and methyl methacrylate (MMA) were studied. The synthesized copolymers were characterized by nuclear magnetic resonance (1 H-NMR), gel permeation chromatography (GPC), Fourier transform infrared spectroscopy (FTIR) and thermogravimetric analysis (TG). FTIR and 1 H NMR spectra showed that the pendant epoxy groups in copolymers remained throughout the copolymerization of AGE. The apparent activation energies for thermal degradation of the copolymers were calculated from their TG data by using Flynn-Wall-Ozawa (FWO), Kissinger-Akahira-Sunose (KAS) and Coats-Redfern methods. The kinetic parameter (pre-exponential factor) and Thermodynamic parameters such as Gibbs energy, enthalpy and entropy were also calculated by Coats-Redfern method. The activation energies calculated by KAS method for Poly(AGE-co-AMA) and Poly(AGE-coMMA) were found to be 292±10 kJ/mol and 175±27 kJ/mol for the first stage, and 252±74 kJ/mol and 232±32 kJ/mol for the second, respectively while they were 361±1 kJ/mol and 249±61 kJ/mol for Poly(AGE-co-AMA) and 136±24 kJ/mol and 278±18 kJ/mol for Poly(AGE-coMMA) by FWO method. The most likely mechanisms of the main degradation stages were determined as F3 model for Poly(AGE-co-AMA) and Poly(AGE-coMMA). Thus, it is concluded that the thermal degradations of Poly(AGE-co-AMA) and Poly(AGE-coMMA) copolymers exhibit similar behavior.

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Thermal degradation behavior and kinetic studies of polyacrylamide gel in TiO2 nanoparticles synthesis

Cited by 12 publications

References 23 publications

Preparation of hydrogel impregnated antimicrobial polyurethane foam for absorption of radionuclide contaminated blood and biological fluids

Preparation of hydrogel impregnated antimicrobial polyurethane foam for absorption of radionuclide contaminated blood and biological fluids

Effects of carbon‐coated titanium dioxide nanoparticles as a photostabilizer on the photodegradation of rigid poly(vinyl chloride)

The Synthesis of Allyl Glycidyl Ether Copolymers and Their Thermokinetic Analysis

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