Kinetic analysis of isothermal curing of unsaturated polyester resin catalyzed with tert-butyl peroxybenzoate and cobalt octoate by differential scanning calorimetry

Xu, Xiaoqiang; Zhou, Quan; Song, Ning; Ni, Qiuru; Ni, Lizhong

doi:10.1007/s10973-017-6246-z

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…For kinetic studies by means of DSC, the rate of reaction is supposed to be proportional to the rate of heat generation and can be expressed using Eq. ( 1 ) (Kamal 1974 ; Xu et al 2017 ). where is the rate of the reaction and ΔH tot is the total heat of the reaction.…”

Section: Resultsmentioning

confidence: 99%

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

et al. 2017

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The physical, mechanical and biological properties of multicomponent acrylate-based hard lenses are directly influenced by degree of conversion achieved during copolymerization. In this research, polyhedral oligomeric silsesquioxane (POSS) acrylate is introduced into the polymer backbone in combination with hydroxyethyl methacrylate, dimethyl itaconate, methyl methacrylate, 3-(trimethoxysilyl) propyl methacrylate and triethylene glycol dimethacrylate in free-radical bulk polymerization. Kinetics of curing process was investigated by two techniques: differential scanning calorimetry and FTIR spectroscopy. Reaction kinetics in free-radical bulk polymerization of the system was studied by isothermal DSC performed at 65, 75, 85, and 95 °C using different quantities of initiator. Three compounds were prepared in different concentrations (0.2, 0.4 and 0.6 mol%) of 2,2′-azobisisobutyronitrile as initiator. Conversion rate was calculated as a function of time using data obtained from DSC measurements. The kinetic parameters of the reaction such as reaction constants, reaction orders and activation energies were obtained from the isothermal DSC data according to the autocatalytic model developed by Kamal and Sourour. The results showed that the experimental values were in good agreement with theoretically estimated values and our results may suggest that the polymerization reaction of this system is well described by Kamal’s model. Cytotoxicity results, performed on extracts 28 days after PBS incubation, showed no toxicity of the materials extracted from the lenses indicating that they can be considered as safe materials in ocular lens applications. The viability and proliferation of L929 fibroblast cells in extracting media were followed by 3-[4,5-dimethylthiazol-2-yl]-2,5-diphenyltetrazolium bromide (MTT) and they may have a great potential as ideal supporting lens in people who suffer from keratoconus disease.Graphical abstract

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Section: Resultsmentioning

confidence: 99%

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

et al. 2017

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“…Since the VOC gas in this experiment is obtained through the vaporization of the corresponding organic solution, a heating crucible is equipped in the gas distribution box, which is to accelerate the evaporation of organic gas, and it is equipped with a gas exchange device and a test circuit [9]. During the test, the relationship between the volume V of the organic liquid to be injected and the gas concentration c in the gas distribution box is as shown in the formula:…”

Section: Experimental Methodsmentioning

confidence: 99%

Preparation of SnO₂‐Based Composite Gas‐Sensitive Material and Its Effect on the Membrane Treatment Process of Volatile Organic Compounds

Shou

Zhao

Qiao

2022

Journal of Nanomaterials

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Semiconductor oxide-sensitive materials can be divided into n-type materials and p-type materials according to this characteristic. The carriers in n-type materials are mainly electrons, which are formed by the existence of a large number of oxygen vacancies in the material’s crystal lattice. Common n-type materials include SnO2, In2O3, and ZnO. This article is aimed at studying the effect of SnO2-based composite gas-sensitive materials on the treatment process of volatile organic compounds. In this paper, the biomembrane method, the ultrafiltration membrane transmembrane pressure difference method, and the chemical reaction activity analysis method in the membrane treatment detection method are proposed, and then, the empirical kinetic model for the preparation of SnO2-based composite gas-sensitive materials is established, and the TPU nanometer is analyzed. The cross-sectional scanning of the composite material explored the effect of the curing agent content on the SnO2-based composite gas-sensitive material and analyzed the mechanical properties of the material. The experiment in this article uses 15 orders of magnitude of mechanics, which improves the scientific nature of the article. The experimental results show that the material modification has a better improvement effect on the film treatment process of volatile organic compounds.

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“…Fourier-transform infrared spectroscopy (FTIR) of the samples (UMP and WMP) was studied using FTIR spectrophotometer (PerkinElmer Spectrum Version 10.4.00) for the absorbance range 4000-450 cm −1 [18], [19]. The thermal (heat change) analysis of the samples was analyzed using DSC (DSC 200 F3 Maia Differential Scanning Calorimeter, NETZSCH) [20]. We bought the DSC crucible and lid set from NETZSCH Technologies India Pvt.…”

Section: Samples (Wmp and Ump) Analysismentioning

confidence: 99%

Study of shrunken (as wrinkles) mango peel

Sinha

2023

Preprint

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Mango peel shrinks as wrinkles after overripening, which physical appearance looks very similar to wrinkled skin of older people. The study includes comparison between UMP (unwrinkled mango peel) and WMP (wrinkled mango peel). FTIR analysis showed higher absorption peak bands for WMP compared to UMP. In DSC experimentation, WMP showed more endothermic nature than UMP. In CHNS elemental analysis, Sulphur was found to be significantly higher in WMP, approximately thrice of UMP. These might also be the possible reasons for the cause of the wrinkled human skin, as the basic compositional elements remain same for mango as well as human.

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Kinetic analysis of isothermal curing of unsaturated polyester resin catalyzed with tert-butyl peroxybenzoate and cobalt octoate by differential scanning calorimetry

Cited by 14 publications

References 23 publications

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

Preparation of SnO₂‐Based Composite Gas‐Sensitive Material and Its Effect on the Membrane Treatment Process of Volatile Organic Compounds

Study of shrunken (as wrinkles) mango peel

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Kinetic analysis of isothermal curing of unsaturated polyester resin catalyzed with tert-butyl peroxybenzoate and cobalt octoate by differential scanning calorimetry

Cited by 14 publications

References 23 publications

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

Cure kinetic study of methacrylate-POSS copolymers for ocular lens

Preparation of SnO2‐Based Composite Gas‐Sensitive Material and Its Effect on the Membrane Treatment Process of Volatile Organic Compounds

Study of shrunken (as wrinkles) mango peel

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Preparation of SnO₂‐Based Composite Gas‐Sensitive Material and Its Effect on the Membrane Treatment Process of Volatile Organic Compounds