Multistage thermal decomposition in films of cadmium chloride-doped PVA–PVP polymeric blend

Baraker, Basavarajeshwari M.; Lobo, Blaise

doi:10.1007/s10973-018-7289-5

Cited by 16 publications

(5 citation statements)

References 43 publications

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“…Figure 4 shows the relation between plotting lnβ/T 2 max and 1000/T max (Kissinger models) to estimate the apparent activation energies for all samples under test. Pure PVA (S1) showed the highest apparent activation energy (E a ~154.8 KJ mol −1 ), which is comparable to the literature (Peng et al 2006) and (Baraker and Lobo 2018). For both nanocomposite and nanocomposite electrolyte sample, the apparent activation energy dropped steadily in to 148.8 KJ mol −1 for PVA/ZnO and 127.2 and 133.8 KJ mol −1 for S3 and S4 nanocomposite electrolyte samples respectively.…”

Section: Heat Volatile Heatsupporting

confidence: 79%

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Naim¹

2020

SJKFU

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A non-isothermal kinetics analysis for poly (vinyl alcohol) (PVA) and its ZnO nanocomposite (5wt.%) loaded with different weight ratios of LiCl, was investigated by thermogravimetric analysis (TGA). The degradation mechanism and the corresponding activation energies were calculated using Kissinger, Flynn-Wall-Ozawa and Coats-Redfern models at different heating rates (5, 10, 20, 30, 40, and 50 °C/min). In general, all models demonstrated their reliability to describe the thermal degradation of samples. The results show a reduction in PVA thermal stability in the presence of ZnO nanoparticles in the PVA matrix. Additionally, ZnO nanoparticles induce an alternative degradation mechanism from one-dimensional diffusion to random nucleation with one or two nuclei on the individual particles. However, the presence of the LiCl salt exhibits negligible effects on the TGA profiles and the activation energy values.

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Section: Heat Volatile Heatsupporting

confidence: 79%

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Naim¹

2020

SJKFU

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“…TGA curves of pure PVP and 17%SiO 2 ‐PVP composite electrospun membranes were shown in Figure 5b. The decomposition of pure PVP took place at ~400–580°C in the air 33,34 . While the first degradation of 17%SiO 2 ‐PVP occurred at a temperature of ~65°C, and the weight loss was ~2.55% due to the removal of very fewer water molecules from the electrospun membranes.…”

Section: Resultsmentioning

confidence: 99%

“…The decomposition of pure PVP took place at $400-580 C in the air. 33,34 While the first degradation of 17%SiO 2 -PVP occurred at a temperature of $65 C, and the weight loss was $2.55% due to the removal of very fewer water molecules from the electrospun membranes. The second major decomposition appeared in the temperature range of 250-360 C, with a 37.5% reduction in weight due to the decomposition of the PVP main chain.…”

Section: 3031mentioning

confidence: 99%

Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

Zhu

Zhao

Tang

et al. 2022

J of Applied Polymer Sci

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Flexible SiO 2 -polyvinyl pyrrolidone hybrid electrospun membranes were prepared using the partially hydrolyzed tetraethyl orthosilicate as cross-linking component based on electrostatic spinning. Then ibuprofen (IBU) was absorbed on the fiber membrane and blocked by grafting azobenzene groups.The target membranes' excellent flexibility, good water resistance, and acceptable mechanical properties were shown. When the content of SiO 2 was 17%, the membranes could withstand at least 50 g tensile strength. Meanwhile and the water contact angle of the membranes was close to that of the skin, which was 68.44 . Also controlled in vitro release performance of IBU under UV irradiation at 37 C and pH of 6.5 was observed. The release behavior was well fitted by Ritger-Peppas kinetic model, suggesting the diffusion release mechanism of the drug. In addition, the membranes possessed the ability to release drugs into hydrogels by self-driving. Thus, the easily prepared membranes possessed the potential to release drugs in different environments.

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“…The polymer layers thickness of all crystal faces was almost the same (Supporting Information, Figure S4), which imply that the thickness was isotropic. In addition, the thermodynamic analysis (Supporting Information, Figures S2,3) of the original Cry ‐ 2 and Cry ‐ 2 @PVA‐(PDDA/PSS) 9 was carried out under the same conditions for further observation and comparison, attributed to dehydration of PVA (245 °C) and decomposition of Cry ‐ 2 and PVA (430–450 °C) [18] …”

Section: Figurementioning

confidence: 99%

“…In addition, the thermodynamic analysis (Supporting Information, Figures S2,3) of the original Cry-2 and Cry-2@PVA-(PDDA/PSS) 9 was carried out under the same conditions for further observation and comparison, attributed to dehydration of PVA (245 8C) and decomposition of Cry-2 and PVA (430-450 8C). [18] It is worth mentioning that when Cry-2 was assembled directly with PVA films, the surface morphology of Cry-2@PVA was corrugated and uneven in some areas (Figure 2 b) because of lack of the transition of PDDA/PSS PEMs. The Cry-2@PVA and Cry-3@PVA which were obtained according to the literature procedure [11] were immersed in THF and DCM respectively (Supporting Information, Figure S1).…”

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confidence: 99%

Polymer‐Coated Organic Crystals with Solvent‐Resistant Capacity and Optical Waveguiding Function

Lan

Liu

et al. 2021

Angewandte Chemie

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Recently, luminescent organic crystals have been widely studied as new optoelectronic materials. However, corrosion and dissolution of organic crystals by solvents have always been a great challenge for the application of organic crystals in various fields. In this work, we propose a general method of fabricating a solvent-resistant coating to prevent organic crystals from being corroded or dissolved by organic solvents. The coatings involved layer-by-layer assembly of poly(diallyldimethylammonium) (PDDA) and poly(styrenesulfonate) (PSS) onto crystals, followed by immersing the coated crystals into polyvinyl alcohol (PVA) aqueous solutions for 2 minutes. The coated crystals can remain intact over 24 h in common organic solvents without being damaged and even insoluble in dichloromethane for 5 days. Moreover, the thin and transparent coatings have little effect on the optical properties of crystals which still have excellent optical waveguide performance with the coatings.

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Multistage thermal decomposition in films of cadmium chloride-doped PVA–PVP polymeric blend

Cited by 16 publications

References 43 publications

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

Polymer‐Coated Organic Crystals with Solvent‐Resistant Capacity and Optical Waveguiding Function

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Multistage thermal decomposition in films of cadmium chloride-doped PVA–PVP polymeric blend

Cited by 16 publications

References 43 publications

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Kinetic Analysis of ZnO Filled PVA-LiCl: Three Phase Electrolyte

Drug release behaviors of flexible SiO2‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli

Polymer‐Coated Organic Crystals with Solvent‐Resistant Capacity and Optical Waveguiding Function

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Drug release behaviors of flexible SiO₂‐polyvinyl pyrrolidone electrospun membranes responsive to multiple stimuli