scholarly journals Differential scanning calorimetry analysis of the thermal treatment of ternary mixtures of ethylene vinyl acetate, polyethylene, and azodicarbonamide

2008 ◽  
Vol 110 (5) ◽  
pp. 3217-3224 ◽  
Author(s):  
J. A. Reyes-Labarta ◽  
A. Marcilla
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Treatment ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Ternary Mixtures ◽  
Differential Scanning Calorimetry Analysis ◽  
Scanning Calorimetry

Recyclable amitraz-ethylene vinyl acetate strips used for beehives treatment against Varroa destructor

2017 ◽  
Vol 50 (5) ◽  
pp. 391-402 ◽  
Author(s):  
Federico Karp ◽  
Julio A Luna ◽  
Luciano N Mengatto
Keyword(s):  
Mass Spectrometry ◽  
Differential Scanning Calorimetry ◽  
Vinyl Acetate ◽  
Varroa Destructor ◽  
Ethylene Vinyl Acetate ◽  
Gas Chromatography Mass Spectrometry ◽  
Recycling Process ◽  
Scanning Calorimetry ◽  
The World ◽  
Natural Pollination

In this work, a new recyclable ethylene-vinyl acetate (EVA)-based strip impregnated with amitraz (AMZ) was prepared, characterized, and evaluated for the treatment of Apis mellifera against Varroa destructor. Bees are important for natural pollination, honey, and related goods production. Varroa destructor is currently considered one of the major pests and important efforts around the world are focused on methods for varroasis treatment. The procedure of strips preparation presented in this work consisted of two steps: impregnation and molding of impregnated pellets. Differential scanning calorimetry and gas chromatography–mass spectrometry analyses confirmed that AMZ molecule resisted the impregnation and molding conditions. The strips were sufficiently strong to resist destruction by the bees. The final infestation was lower in the hives treated with AMZ/EVA strips than in those treated with commercial strips. In order to check the possibility of recycling, strips were cut into little pieces and were subjected to total AMZ extraction. Finally, the fragments were exposed to re-impregnation and molding. The strips prepared after the recycling process presented the same shape and AMZ load than fresh strips.

Influence of Zinc Oxide Addition on Azodicarbonamide Thermal Decomposition in the Polyethylene/Ethylene Vinyl Acetate Foaming Release

2021 ◽  
Vol 1028 ◽  
pp. 234-239
Author(s):  
Bambang Afrinaldi ◽  
David Natanael Vicarneltor ◽  
Reza Pahlevi Rudianto ◽  
Arif Rachman Hakim ◽  
Opa Fajar Muslim
Keyword(s):  
Differential Scanning Calorimetry ◽  
Zinc Oxide ◽  
Thermal Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Decomposition Temperature ◽  
Scanning Calorimetry ◽  
Blowing Agent ◽  
Foaming Process ◽  
Oxide Addition

Thermal properties, i.e. melting point and decomposition temperature of polymers, azodicarbonamide (ADC), and other additives mixture, are the most important information to determine the appropriate foaming process parameters. ADC has been widely used as a blowing agent for foam fabrication. Here, ADC will decompose and release gas which will be trapped in the melting polymer to make a foamed product. Originally, ADC has a decomposition temperature at around 220°C. In this study, the effect of Zinc Oxide (ZnO) addition on the thermal properties of intermediate product and Polyethylene/Ethylene Vinyl Acetate (PE/EVA) foam with ADC as the blowing agent was investigated. ZnO addition decreased the decomposition temperature of ADC. The thermal properties were characterized by Differential Scanning Calorimetry (DSC). The result showed that the decomposition temperature of ADC significantly decreased from the temperature of 220°C to 170°C with the increment of the ZnO.

scholarly journals Влияние пероксида на температурные зависимости электропроводности углеродсодержащего полимерного композита

2020 ◽  
Vol 46 (12) ◽  
pp. 3
Author(s):  
А.М. Зюзин ◽  
А.А. Карпеев ◽  
Н.В. Янцен
Keyword(s):  
Differential Scanning Calorimetry ◽  
Temperature Dependence ◽  
Vinyl Acetate ◽  
Polymer Composite ◽  
Ethylene Vinyl Acetate ◽  
Clear Correlation ◽  
Scanning Calorimetry ◽  
Significant Difference ◽  
Temperature Dependences ◽  
Characteristic Points

A significant difference was found in the temperature dependences of the resistivity of a carbon-containing polymer composite based on ethylene-vinyl acetate and the same composite saturated with peroxide. The presence of a sufficiently clear correlation between the characteristic points on the temperature dependence of the resistivity and on the curves of the differential scanning calorimetry was established.

scholarly journals Wastes from Agricultural Silage Film Recycling Line as a Potential Polymer Materials

Polymers ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1383
Author(s):  
Jerzy Korol ◽  
Aleksander Hejna ◽  
Klaudiusz Wypiór ◽  
Krzysztof Mijalski ◽  
Ewelina Chmielnicka
Keyword(s):  
Vinyl Acetate ◽  
Thermal Performance ◽  
Mechanical Performance ◽  
Ethylene Vinyl Acetate ◽  
Tensile Tests ◽  
Solid Particles ◽  
Polymer Materials ◽  
Slight Reduction ◽  
Scanning Calorimetry ◽  
Crystallinity Degree

The recycling of plastics is currently one of the most significant industrial challenges. Due to the enormous amounts of plastic wastes generated by various industry branches, it is essential to look for potential methods for their utilization. In the presented work, we investigated the recycling potential of wastes originated from the agricultural films recycling line. Their structure and properties were analyzed, and they were modified with 2.5 wt % of commercially available compatibilizers. The mechanical and thermal performance of modified wastes were evaluated by tensile tests, thermogravimetric analysis, and differential scanning calorimetry. It was found that incorporation of such a small amount of modifiers may overcome the drawbacks caused by the presence of impurities. The incorporation of maleic anhydride-grafted compounds enhanced the tensile strength of wastes by 13–25%. The use of more ductile compatibilizers—ethylene-vinyl acetate and paraffin increased the elongation at break by 55–64%. The presence of compatibilizers also reduced the stiffness of materials resulting from the presence of solid particles. It was particularly emphasized for styrene-ethylene-butadiene-styrene and ethylene-vinyl acetate copolymers, which caused up to a 20% drop of Young’s modulus. Such effects may facilitate the further applications of analyzed wastes, e.g., in polymer film production. Thermal performance was only slightly affected by compatibilization. It caused a slight reduction in polyethylene melting temperatures (up to 2.8 °C) and crystallinity degree (up to 16%). For more contaminated materials, the addition of compatibilizers caused a minor reduction in the decomposition onset (up to 6 °C). At the same time, for the waste after three washing cycles, thermal stability was improved. Moreover, depending on the desired properties and application, materials do not have to go through the whole recycling line, simplifying the process, reducing energy and water consumption. The presented results indicate that it is possible to efficiently use the materials, which do not have to undergo the whole recycling process. Despite the presence of impurities, they could be applied in the manufacturing of products which do not require exceptional mechanical performance.

Crystallization kinetics mechanism investigation of sol–gel-derived NaYF4:(Yb,Er) up-converting phosphors

CrystEngComm ◽  
2017 ◽  
Vol 19 (34) ◽  
pp. 4992-5000 ◽  
Author(s):  
C. Bartha ◽  
C. E. Secu ◽  
E. Matei ◽  
M. Secu
Keyword(s):  
Differential Scanning Calorimetry ◽  
Crystallization Kinetics ◽  
Sol Gel ◽  
Model Fitting ◽  
Crystallization Mechanism ◽  
Differential Scanning Calorimetry Analysis ◽  
Scanning Calorimetry ◽  
Model Free

The crystallization mechanism of sol–gel-derived NaYF4:(Yb,Er) up-converting phosphors has been studied by differential scanning calorimetry analysis using both model-free and model fitting approaches.

scholarly journals Graphene Oxide and Oxidized Carbon Black as Catalyst for Crosslinking of Phenolic Resins

Polymers ◽  
2019 ◽  
Vol 11 (8) ◽  
pp. 1330 ◽  
Author(s):  
Maria Rosaria Acocella ◽  
Aniello Vittore ◽  
Mario Maggio ◽  
Gaetano Guerra ◽  
Luca Giannini ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Thermal Treatment ◽  
Carbon Black ◽  
Crosslinking Reaction ◽  
Scanning Calorimetry ◽  
Indirect Methods ◽  
Phenolic Resins ◽  
Oxidized Carbon

Influence of different graphite-based nanofillers on crosslinking reaction of resorcinol, as induced by hexa(methoxymethyl)melamine, is studied. Curing reactions leading from low molecular mass compounds to crosslinked insoluble networks are studied by indirect methods based on Differential Scanning Calorimetry. Reported results show a catalytic activity of graphene oxide (eGO) on this reaction, comparable to that one already described in the literature for curing of benzoxazine. For instance, for an eGO content of 2 wt %, the exothermic crosslinking DSC peak (upon heating at 10 °C/min) shifted 6 °C. More relevantly, oxidized carbon black (oCB) is much more effective as catalyst of the considered curing reaction. In fact, for an oCB content of 2 wt %, the crosslinking DSC peak can be shifted more than 30 °C and a nearly complete crosslinking is already achieved by thermal treatment at 120 °C. The possible origin of the higher catalytic activity of oCB with respect to eGO is discussed.

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