scholarly journals Development of Low-Viscosity and High-Performance Biobased Monobenzoxazine from Tyrosol and Furfurylamine

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 440
Author(s):  
Zhibin Wen ◽  
Leïla Bonnaud ◽  
Rosica Mincheva ◽  
Philippe Dubois ◽  
Jean-Marie Raquez
Keyword(s):  
Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
High Performance ◽  
Thermomechanical Behavior ◽  
Reduction Temperature ◽  
Scanning Calorimetry ◽  
Promising Candidate ◽  
Rheological Measurements ◽  
Low Viscosity ◽  
Solventless Synthesis

This work details the scalable and solventless synthesis of a potential fully biobased monobenzoxazine resin derived from tyrosol and furfurylamine. The structure of the monomer was studied by nuclear magnetic resonance (NMR) spectroscopy and Fourier transform infrared (FTIR). The curing of the precursors was characterized by differential scanning calorimetry (DSC), rheological measurements, and thermogravimetric analysis (TGA). The properties of the resulting biobased polybenzoxazine were then determined by thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMA). A thermally stable resin was obtained with 5% and 10% weight-reduction-temperature (Td5 and Td10) values of 349 and 395 °C, respectively, and a char yield of 53%. Moreover, the low melting temperature, low viscosity, and excellent thermomechanical behavior make this fully biobased resin a promising candidate for coating applications.

Effect of Meta- and Para-Substitution of the Aromatic Diamines on the Properties of Poly(Amidoimidourethane)

2016 ◽  
Vol 721 ◽  
pp. 23-27 ◽  
Author(s):  
Ilya Kobykhno ◽  
Oleg Tolochko ◽  
Ekaterina Vasilyeva ◽  
Andrei Didenko ◽  
Danila Kuznetcov ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Polymer Structure ◽  
Multiblock Copolymers ◽  
Thermal And Mechanical Properties ◽  
Amino Groups ◽  
Scanning Calorimetry ◽  
Aromatic Diamines

The paper experimentally studies the effect of meta and para- substitution of the amino groups in the diamine used in the synthesis of multiblock copolymers. The way for synthesis of new multiblock copolymers with the possibility of replacing the diamine in the polymer structure was shown. Thermal and mechanical properties of synthesized copolymers had been characterized by means of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical thermal analysis and by nanoindentation and tensile test.

Studies of the Physical Properties of Cycloaliphatic Epoxy Resin Reacted with Anhydride Curing Agents

2017 ◽  
Vol 737 ◽  
pp. 248-255 ◽  
Author(s):  
Tae Hee Kim ◽  
Dae Yeon Kim ◽  
Choong Sun Lim ◽  
Bong Kuk Seo
Keyword(s):  
Physical Properties ◽  
Reaction Kinetics ◽  
Epoxy Resin ◽  
High Performance ◽  
Industrial Applications ◽  
Scanning Calorimetry ◽  
Low Viscosity ◽  
High Performance Polymer ◽  
Curing Agents ◽  
The Impact

The preparation of high performance epoxy composites for industrial applications has been extensively researched. In this report, we study the change in physical properties and reaction kinetics between epoxy resin and curing agents of similar geometry. For the experiments, celloxide 2021P, an epoxy resin having low viscosity, was blended with three different curing agents: methylhexahydropthalic acid, methyltetrahydropthalic acid, and 5-norbornene-2, 3-dicarboxylic anhydride. The amount of 1, 2-dimethylimidazole catalyst was controlled, and the highest heat flow temperature (Tpeak) was observed at around 145 °C. The impact on reaction kinetics relative to the change in heating rate was studied with differential scanning calorimetry (DSC) for each of the curing agents. The glass transition temperature (Tg) of each composition was measured with a second DSC cycle. The prepared epoxy compositions were thermally cured in a metallic mold to provide pure epoxy resins without fillers. Finally, the flexural strengths of these resins were compared to each other. The authors believe that insights into choosing an appropriate epoxy binder are useful when it comes to the overall preparation of high performance polymer composites.

scholarly journals Novel Bio-Based Epoxy Thermosets Based on Triglycidyl Phloroglucinol Prepared by Thiol-Epoxy Reaction

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 337 ◽  
Author(s):  
Dailyn Guzmán ◽  
David Santiago ◽  
Àngels Serra ◽  
Francesc Ferrando
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermogravimetric Analysis ◽  
Bisphenol A ◽  
Diglycidyl Ether ◽  
Scanning Calorimetry ◽  
High Transparency ◽  
Epoxy Curing ◽  
Curing Agents

The pure trifunctional glycidyl monomer from phloroglucinol (3EPO-Ph) was synthesized and used as feedstock in the preparation of novel bio-based thermosets by thiol-epoxy curing. The monomer was crosslinked with different commercially available thiols: tetrafunctional thiol (PETMP), trifunctional thiol (TTMP) and an aromatic dithiol (TBBT) as curing agents in the presence of a base. As catalyst, two different commercial catalysts: LC-80 and 4-(N,N-dimethylamino) pyridine (DMAP) and a synthetic catalyst, imidazolium tetraphenylborate (base generator, BG) were employed. The curing of the reactive mixtures was studied by using DSC and the obtained materials by means of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA) and dynamic mechanical thermal analysis (DMTA). The results revealed that only the formulations catalyzed by BG showed a latent character. Already prepared thermosetting materials showed excellent thermal, thermomechanical and mechanical properties, with a high transparency. In addition to that, when compared with the diglycidyl ether of bisphenol A (DGEBA)/PETMP material, the thermosets prepared from the triglycidyl derivative of phloroglucinol have better final characteristics and therefore this derivative can be considered as a partial or total renewable substitute of DGEBA in technological applications.

Study on Thermal Decomposition Characteristics of Magnesium Salt Flame Retardants

2014 ◽  
Vol 915-916 ◽  
pp. 1058-1061 ◽  
Author(s):  
Xu Zhang ◽  
Dan Li ◽  
Hua Xie ◽  
Rui Feng Ma
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Differential Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Flame Retardant ◽  
High Performance ◽  
Flame Retardants ◽  
Magnesium Salt ◽  
Combustible Gas ◽  
Optimization Parameters

Magnesium salt flame retardant is a new filler flame retardant agent, and can release the water and absorb the latent heat during the thermal decomposition, which can effectively inhibit the polymers decomposition and cool the combustible gas generated in the case of fire. In this paper, the magnesium salt flame retardant is synthesized in different conditions. Then the thermal decomposition features of the magnesium salt flame retardants with the smallest particle diameters are characterized by using thermogravimetric analysis and differential thermal analysis. Finally, on the basis of this analysis, optimization parameters for preparing the magnesium salt flame retardant with good thermal decomposition performance are obtained, which may be helpful for guiding the preparation of high-performance magnesium salt flame retardants and providing a beneficial reference.

High-Performance Thermoset–Thermoset Polymer Blends: A Review of the Chemistry of Cyanate Ester–Bismaleimide Blends

1996 ◽  
Vol 8 (1) ◽  
pp. 83-95 ◽  
Author(s):  
Ian Hamerton
Keyword(s):  
Thermal Analysis ◽  
Nuclear Magnetic Resonance ◽  
Differential Scanning Calorimetry ◽  
High Performance ◽  
Diels Alder ◽  
Cyanate Ester ◽  
Interpenetrating Networks ◽  
Scanning Calorimetry ◽  
Glass Transition Temperatures ◽  
Thermoset Polymer

Various blends of a commercial bismaleimide (BMI) mixture, a cyanate ester (CE) and a co-monomer with allyl and cyanate pendant groups were formulated and cured. Differential scanning calorimetry (DSC) data were used to monitor the cure of neat resins, while dynamic mechanical thermal analysis (DMTA) was used to assess cure by the measurement of glass transition temperatures ( Tg). It is suggested that following cyclotrimerization of the CE component, the co-reaction between allyl CE and BMI occurs via an ‘ene’/Diels–Alder mechanism (to form linked interpenetrating networks, LIPNs) as evidenced by 13C nuclear magnetic resonance (NMR) spectroscopy. DMTA reveals that, unlike the commercial CE/BMI blends, the cured LIPNs may display a single Tg value which may exceed 350°C depending on the co-monomers used.

scholarly journals Thermal analysis of different Refuse Derived Fuels (RDFs) samples

2021 ◽  
pp. 249-249
Author(s):  
Gizem Ayas ◽  
Hakan Öztop
Keyword(s):  
Thermal Analysis ◽  
Thermogravimetric Analysis ◽  
Winter Season ◽  
Calorific Value ◽  
Heterogeneous Structure ◽  
Municipal Solid Wastes ◽  
Scanning Calorimetry ◽  
Daily Lives ◽  
Refuse Derived Fuel ◽  
Refuse Derived Fuels

As a result of the activities carried out by people to maintain their daily lives in different places such as homes, hospitals, hotels or workplaces, waste consisting of furniture, paint, batteries, food waste, sachets, bottles, fabrics, and fibers with the heterogeneous structure is called Municipal Solid Waste (MSW). Secondary fuels with higher heating value, which are generated by recycling of non-recyclable and reusable wastes in municipal solid wastes, are called as Refuse Derived Fuel (RDF). In this study, Refuse Derived Fuel1 (RDF1 : taken in December, winter season) and Refuse Derived Fuel2 (RDF2 : taken in June, summer season) samples obtained from different dates were used. The ultimate, proximate, calorific value, X-Ray fluorescence (XRF), Thermogravimetric analysis (TGA), and Differential scanning calorimetry (DSC) analysis were performed for these samples. Combustion characterization from Refuse Derived Fuel samples was investigated in the applied analyzes. The results of the content analysis made were examined separately and compared with the Thermogravimetric analysis and Differential Thermal Analysis combustion graph curves. It was revealed that the Refuse Derived Fuel1 sample had a better combustion compared to the Refuse Derived Fuel2 sample, as the ash amount and content obtained as a result of the combustion also supported other data. In addition, the results of the analysis show how different the Refuse Derived Fuel samples taken from the same region in two different months are different from each other.

scholarly journals Thermal analysis of N-carbamoyl benzotriazole derivatives

2015 ◽  
Vol 65 (2) ◽  
pp. 207-213
Author(s):  
Ivan Kos ◽  
Tin Weitner ◽  
Sandra Flinčec Grgac ◽  
Jasna Jablan
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Thermogravimetric Analysis ◽  
Scanning Calorimetry ◽  
Decomposition Products ◽  
Structural Analogues ◽  
Benzotriazole Derivatives

Abstract Thermal properties of N-carbamoyl benzotriazole derivatives and N,N’,N’’-tribenzyloxyisocyanuric acid were investigated using thermogravimetric analysis and differential scanning calorimetry. The results revealed a difference between structural analogs of N-carbamoyl benzotriazole derivatives. They seem to be in agreement with the previously proposed formation of N,N’,N’’-tribenzyloxyisocyanuric acid from 1-(N-benzyloxycarbamoyl) benzotriazole, via an intermediary N-benzyloxyisocyanate acid, during heating. Substantially different thermal properties were observed for structural analogues, 1-(N-methoxycarbamoyl) benzotriazole and 1-(N-ethoxycarbamoyl) benzotriazole. In contrast to N-benzyloxyisocyanate, no corresponding reactions were observed for their decomposition products, i.e., methoxyisocyanate and ethoxyisocyanate.

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