Nichollas Guimarães Jaques

University of Bordeaux

Epoxy resin suitable for structural composite based on bisphenol A diglycidyl ether (DGEBA) was mixed with anhydride methyl tetrahydrophthalic (MTHPA) as curing agent. As catalyzer two systems were investigated, the synthetic 2,4,6-tris(dimethylaminomethyl)phenol (DEH 35), and the natural based on chicken eggshell (E) and chicken eggshell membrane...

Epoxy resins from bisphenol A of diglycidyl ether/anhydride methyl tetrahydrophthalic/2,4,6-tris dimethylaminomethyl phenol were prepared by mechanical mixing using a magnetic stirrer. Substitution of synthetic catalyzer by eggshell powders provided high performance biobased materials. Chemical character analysis of epoxy/eggshell carried out using...

Epoxy resin based on bisphenol A diglycidyl ether/anhydride methyl tetrahydrophthalic/2,4,6-tris(dimethylaminomethyl)phenol (DGEBA/MTHPA/DEH 35) was produced by magnetic stirring; chicken eggshell (ES) was added as cure improver. Thermal stability, cure parameters, mechanical properties, and fracture surface were investigated by thermogravimetry (T...

Epoxy compound based on diglycidyl ether of bisphenol A (DGEBA), methyl tetrahydrophthalic anhydride (MTHPA) as hardener and 2,4,6-tris (dimethylaminomethyl) phenol (DEH 35) as catalyzer, at 100/87/5 as fixed concentration was successfully processed. Aiming workable thermoset, thermoplastic Polycaprolactone (PCL) was added at 10, 20 and 30 phr cont...

Compounds of poly(3-hydroxybutyrate) (PHB) and zinc oxide with filler content between 1 and 10% were prepared in a laboratory internal mixer. The effect of heating and cooling rates on the crystallization and melting of PHB/ZnO compounds was investigated by differential scanning calorimetry. Physical aspects of the compounds were examined by means...

Diglycidil ether of isosorbide (DGEISO), a potential biobased substitute for petro-based epoxy resin, such as to diglycidil ether of bisphenol A (DGEBA), was synthesized with a classic epoxidation route using isosorbide, epichlorohydrin, and sodium hydroxide. Fourier-transform infrared spectroscopy (FTIR) an inexpensive and fast technique, was used...

This work investigated the biodegradation and thermal degradation, of PLA oligomers with specific molecular weights, i.e., 800, 4000, and 10000 g/mol, coded as PLA800, PLA4000 and PLA10000, synthesized through ring-opening polymerization of lactide using defined amounts of 1,2-propanediol. From the biodegradation in soil, lower molecular weight oli...

This work investigated the curing and degradation behavior of compounds made with 1:1 of bisphenol A diglycidyl ether and epoxidized soybean oil, cured with itaconic acid (ITA) and succinic acid (SUC), coded as EP/ITA and EP/SUC. Complex peaks observed in differential scanning calorimetry are mostly due to the catalyzed curing and homopolymerizatio...

Abstract In this work eggshell membrane was added as biobased curing catalyst to epoxy (DGEBA), for comparison purposes the synthetic catalyst DEH 35 data was reported, the curing of compounds was followed through differential scanning calorimetry (DSC) under dynamic conditions and their kinetics were modeled using Kissinger, Friedman, Friedman mod...

Epoxidized soybean oil (ESO) compounds were cured with methyl tetrahydrophthalic anhydride (MTHPA) as hardener and 2,4,6‐tris (dimethylaminomethyl) phenol (DEH 35) as catalyst. To figure out MTHPA and DEH 35's influence during curing and degradation, ESO/MTHPA/DEH 35 compounds were investigated using Fourier‐Transform Infrared Spectroscopy (FTIR),...

Biocompounds based on poly(butylene adipate‐co‐terephthalate) (PBAT) and polylactic acid (PLA) were produced at 50:50 with 1% and 5% of Babassu. Modulated differential scanning calorimetry was employed to elucidate their complex melt and cold crystallizations and recrystallization. Heat flow signals under applied amplitudes/frequencies did not sign...

Degradation mechanisms and curing on diglycidyl ether of bisphenol A/methyl tetrahydrophthalic anhydride with 2,4,6-tris (dimethylaminomethyl) phenol as synthetic catalyst or eggshell membrane as natural catalyst, i.e., DGEBA/MTHPA/DEH 35 and DGEBA/MTHPA/M, respectively, were investigated by thermogravimetry (TGA) and Fourier transform infrared spe...

The curing kinetics of thermoset-thermoplastic compounds based on diglycidyl ether of bisphenol A (DGEBA), methyl tetrahydrophthalic anhydride (MTHPA) as the hardener, 2,4,6-tris(dimethylaminomethyl)phenol (DEH 35) as a catalyzer, and poly(lactic acid) (PLA) as workable (i.e., with repairable bonds) phase was investigated using Fourier transform in...

The non-isothermal curing kinetics of DGEBA/PCL/MTHPA/DEH 35 blends at 10, 20 and 30 phr of PCL were investigated applying Ozawa, Kissinger, Friedman autocatalytic, Friedman isoconversional and Málek models. From verified discrepancies between theoretical and experimental fits measured based on the models parameters such as activation energy (Ea) a...

In this work, poly(lactic acid) (PLA)-based vegetal Babassu composites were compounded and their thermal properties ascertained. Babassu acted as a facilitator agent for the nonisothermal cold crystallization of PLA. Nonisothermal cold crystallization kinetics of PLA compounds was investigated by differential scanning calorimetry applying Ozawa and...

Ceramic membranes are of great industrial interest in separation processes. They are characterized by high chemical and thermal stabilities and filtration capacity at high temperatures (>500 °C) in a wide range of pH values. However, the major disadvantage of ceramic membranes is the high-cost of production involving synthetic raw materials, usuall...

This work investigated the melting and nonisothermal melt crystallization of poly (butylene terephthalate) (PBT) and poly (ε-caprolactone) (PCL) blends with PCL content ranging from 3 to 10% of the weight. Thermal stability and morphology analyses were performed by thermogravimetry (TG) and scanning electron microscopy (SEM), whereas the nonisother...

Films of Poly(?-caprolactone) (PCL) and PCL/Zinc Oxide (ZnO) were obtained by solution processing. Thermal behaviour and morphological structure were analysed by means of Thermogravimetry (TGA), Differential Scanning Calorimetry (DSC), Optical Microscopy (OM) and Scanning Electron Microscopy (SEM). The addition of ZnO to PCL decreased the degradati...

Abstract Compounds of poly(3-hydroxybutyrate) (PHB) and titanium dioxide (TiO2) with filler content between 1% and 10% were prepared in a laboratory internal mixer. The effect of heating and cooling rates on the crystallization and melting of PHB/TiO2 compounds was investigated by differential scanning calorimetry (DSC). Melt and cold crystallizati...

Compounds of poly(butylene terephthalate) (PBT) and zinc oxide (ZnO) with filler content between 1 and 10% were prepared in a laboratory internal mixer. The processing parameters did not damage PBT thermal stability or its molecular weight as evidenced by torque rheology. The melt crystallization of PBT/ZnO compounds was investigated by differentia...

PHB/TiO2 and PHB/ZnO compounds were prepared in a laboratory internal mixer. Crystallization was investigated by differential scanning calorimetry (DSC) with heating and cooling rates ranging from 5 to 30 °C/min. Fractured surface of selected samples was analysed by scanning electron microscopy (SEM). From the SEM images, it was observed that ZnO a...