Thermal Decomposition Behavior of Poly (Vinyl Alcohol) with Different Hydroxyl Content

Yang, Hanwei; Xu, Shoubin; Jiang, Long; Dan, Yi

doi:10.1080/00222348.2011.597687

Cited by 135 publications

(68 citation statements)

References 15 publications

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“…Two steps of decomposition can be observed for the line (b), which corresponds to PVA; the first of these steps is between 240 • C and 340 • C and second between 390 • C and 470 • C, which is in agreement with the literature [46][47][48]. Line (c) reveals two weight-loss stages in the thermal behavior of trehalose.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 86%

Effect of UV and Gamma Irradiation Sterilization Processes in the Properties of Different Polymeric Nanoparticles for Biomedical Applications

et al. 2020

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The sterilization processes of nanoparticles (NP) by autoclaving and filtration are two of the most utilized methods in the pharmaceutical industry but are not always a viable option. For this reason, the search for alternative options such as UV and gamma radiation is of interest. In this work, we evaluated both types of sterilization on two types of NP in solid state widely employed in the literature for biomedical applications, poly-(ε-caprolactone) and poly(d,l-lactide-co-glycolide) acid NP stabilized with polyvinyl alcohol. Physicochemical properties and cell viability were studied pre-and post-sterilization. The efficiency of irradiation sterilization was performed by a test of sterility using 1 × 10 8 CFU/mL of Escherichia coli, Staphylococcus aureus, and Candida albicans. Microbiological monitoring revealed that both methods were sufficient for sterilization. After the UV irradiation sterilization (100 µJ/cm 2 ), no substantial changes were observed in the physicochemical properties of the NP or in the interaction or morphology of human glial cells, though 5 and 10 kGy of gamma irradiation showed slight changes of NP size as well as a decrease in cell viability (from 100 µg/mL of NP). At 5 kGy of radiation doses, the presence of trehalose as cryoprotectant reduces the cell damage with high concentrations of NP, but this did not occur at 10 kGy. Therefore, these methods could be highly effective and low-processing-time options for sterilizing NP for medical purposes. However, we suggest validating each NP system because these generally are of different polymer-composition systems.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 86%

Effect of UV and Gamma Irradiation Sterilization Processes in the Properties of Different Polymeric Nanoparticles for Biomedical Applications

et al. 2020

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“…The calculated activation energy values for two methods are very close, and the standard deviation values given in this table are adequately small. The activation energy value calculated using different kinetic methods for the main peak of PVA(80) is higher than those obtained for PVA(98). A similar behavior has been reported for thermal degradation of PVA in both argon and air atmospheres [33,35]. This difference can be attributed to the smaller degree of hydrolysis and also the lower molecular weight of PVA(80).…”

Section: Ftir Analysis Of Gaseous Degradation Products For Pva(80)supporting

confidence: 73%

Kinetic analysis of the complex process of poly(vinyl alcohol) pyrolysis using a new coupled peak deconvolution method

Taghizadeh

Yeganeh

Rezaei

2014

J Therm Anal Calorim

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A peak deconvolution procedure used for the analysis of data corresponding to simultaneous overlapping processes begins with separation of individual processes using functions such as Gaussian, Lorentzian, Weibull, and Fraser-Suzuki (FS) followed by application of kinetic analysis methods to the separated peaks. We propose a coupled peak deconvolution procedure to link the parameters of the FS functions of similar peaks in two DTG curves obtained at different linear heating rates, so that the coordinates of each peak can be obtained in a constrained manner. The proposed technique is a kinetic deconvolution method rather than a pure mathematical deconvolution technique. To analyze individual peaks in our study, the non-parametric kinetic and Freidman's isoconversional methods have been applied to determine kinetic triplet of each process. This technique has been tested with both simulated and experimental data. Using this technique, the effects of molecular weight and degree of hydrolysis of polyvinyl alcohol (PVA) samples on reaction mechanism and activation energy of thermal degradation were studied. The presence of acetate group in the PVA samples causes thermal stability, decreases the rate of main reactions, and increases the activation energy. The results of this study may help tailor heat-resistant materials with proper choice of polymer characteristics.

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“…The onset temperatures of thermal degradation were calculated from the first derivative of the mass loss (data not shown): Gelatin (287.6 AE 7.2 a C), chitosan (262.4 AE 8.7 b C), and PVA (243.0 AE 2.3 b C). 31 Gelatin and chitosan showed a second exothermic transition attributed to the further combustion of the residual organic compounds (450 C). The first exothermic transition is associated with the first decomposition stage of the polymers (200-400 C).…”

Section: Resultsmentioning

confidence: 99%

Development of gelatin/chitosan/PVA hydrogels: Thermal stability, water state, viscoelasticity, and cytotoxicity assays

Rodríguez‐Rodríguez

García-Carvajal

Jiménez‐Palomar³

et al. 2018

J of Applied Polymer Sci

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Gelatin/chitosan/poly(vinyl alcohol) (PVA) hydrogels were fabricated with different polymer ratio using the freeze-drying process. The thermal stability, water state, rheological, and cytotoxic properties of the hydrogels were evaluated. Thermogravimetric/differential scanning calorimetry analyses showed a decomposition onset temperature below 242.7 AE 2.7 C. The samples did not show statistical differences (p < 0.05) on the onset temperature values. Nonfreezing water reached a constant value around of 1 g water/g polymer. Freezing water increased linearly with the increase of the water content independently of the polymer ratio. The hydrogels showed an equilibrium water content from 9 to 13 times their mass. The hydrogels exhibited a solid-viscoelastic behavior. The elastic modulus was higher with the increase of chitosan concentration (G 0 = 22 170 AE 85 Pa) independently of the temperature (5-55 C). In vitro assay showed that hydrogels are nontoxic in the HT29-MTX-E12 cell line. These results indicate that the gelatin/chitosan/PVA hydrogels could be considered for biomedical applications.

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Thermal Decomposition Behavior of Poly (Vinyl Alcohol) with Different Hydroxyl Content

Cited by 135 publications

References 15 publications

Effect of UV and Gamma Irradiation Sterilization Processes in the Properties of Different Polymeric Nanoparticles for Biomedical Applications

Effect of UV and Gamma Irradiation Sterilization Processes in the Properties of Different Polymeric Nanoparticles for Biomedical Applications

Kinetic analysis of the complex process of poly(vinyl alcohol) pyrolysis using a new coupled peak deconvolution method

Development of gelatin/chitosan/PVA hydrogels: Thermal stability, water state, viscoelasticity, and cytotoxicity assays

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