Reaction Calorimetry
Mostrando 13-24 de 88 artigos, teses e dissertações.
-
13. Synthesis of graft copolymers of acrylamide for locust bean gum using microwave energy: swelling behavior, flocculation characteristics and acute toxicity study
The graft copolymer of locust bean gum (LBG) and acrylamide has been synthesized by microwave assisted method using potassium persulphate (KPS) as an initiator in aqueous medium. Different reaction parameters such as time, initiator concentration, monomer concentration, polymer concentration, and microwave power were studied to get maximum graft copolymer. T
Polímeros. Publicado em: 2015-04
-
14. Solid state polymerization of pet/pc extruded blend: effect of reaction temperature on thermal, morphological and viscosity properties
A systematic study of solid state polymerization (SSP), concerning the melt extruded blend of poly(ethylene terephthalate)/polycarbonate (catalyzed PET/PC, 80/20 wt %), as a function of temperature range (180-190°C) for a fixed time (6 h) is presented. The materials obtained were evaluated by differential scanning calorimetry (DSC), thermogravimetry/derivat
Polímeros. Publicado em: 2014-08
-
15. Synthesis and characterization of a novel terpolymer based on L-lactide, D,L-lactide and trimethylene carbonate
Terpolymers of L-lactide, D,L-lactide and trimethylene carbonate (TMC) were synthesized via the ring-opening polymerization reaction for cyclic monomers using stannous octoate as the initiator at a ratio of ~0.05 mol% (monomers/(SnOct)2). Synthesis was done at 130 ºC for 48 h. The inclusion of TMC, an aliphatic elastomeric polycarbonate, alongside polymer c
Mat. Res.. Publicado em: 27/05/2014
-
16. Synthesis and thermal behavior of polyacrylonitrile/vinylidene chloride copolymer
Polyacrylonitrile fiber encompasses a broad range of products based on acrylonitrile (AN) which is readily copolymerized with a wide range of ethylenic unsaturated monomers giving rise to polymers with different characteristics and applications. Such products can be designed for cost-effective, flame and heat resistant solutions for the textile industry, air
Polímeros. Publicado em: 27/05/2014
-
17. Development of Polyamide 6/Compound by Recycled Rubber Blends Using Graphitized Polyethylene or Polypropylene with Maleic Anhydride as Compatibilizer Agent
ABSTRACT: The toughening of polyamide 6 is desirable for many applications and may be obtained by adding a phase to the elastomeric matrix. However, this leads to a loss in its rigidity characteristics. Therefore, this study aimed at developing blends of polyamide 6/compound by recycled rubber (SBR-R), with the addition of compatibilizer graphitized polyethy
J. Aerosp. Technol. Manag.. Publicado em: 2013-06
-
18. Influence of glass and sisal fibers on the cure kinetics of unsaturated polyester resin
The effect of grinded glass and sisal fibers (25 vol%) on the cure kinetics of composites of unsaturated polyester resin (UPR) was investigated by differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). The DSC analysis was carried out at four different heating rates (5, 10, 20 and 40 °C/min), and the cure enthalpy and activation ene
Materials Research. Publicado em: 26/06/2012
-
19. Síntese e caracterização de poliuretano à base de óleo de Mabea fistulifera Mart. e sua utilização para remoção de corantes têxteis / Synthesis and characterization of Mabea fistulifera Mart. oil based polyurethane its use for textile dyes removal
Hard polyurethane polymers (PU-1, PU-2, PU-3 and PU-4) were developed in this study, obtained from polyols derived from Mabea fistulifera Mart oil. The chemical modification of the oil occurred through an in situ hydroxylation reaction employing acetic acid, hydrogen peroxide and sulfuric acid. The reaction conditions were optimized using a factorial composi
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2011
-
20. Síntesis de microcápsulas de poliurea a partir de aminas renovables, mediante doble emulsificación
This paper reports on the microencapsulation of a commercial perfume by means of a double emulsification, where the polyurea shell was synthesized by the reaction of lysine with two commercial di-isocyanates (aromatic and aliphatic). In the synthesis the factors evaluated were the amine:di-isocyanate molar ratio and the type of emulsifier. The particle size
Polímeros. Publicado em: 13/05/2011
-
21. Precipitation reaction in alpha-Cu-Al-Ag alloys
The Ag-rich precipitates formation reaction in the Cu-9.22%at. Al-4.66%at. Ag, Cu-9.31%at. Al-5.83%at. Ag and Cu-9.37%at. Al-7.08%at. Ag alloys was studied using microhardness change measurements with temperature and time, differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X-ray diffractometry (XRD). The results indicated that th
Matéria (Rio de Janeiro). Publicado em: 2011
-
22. Síntese, caracterização e polimerização de bis(metacrilamida)s
The aim of this study was the synthesis, characterization and investigation of kinetic behavior of photo- and thermal polymerization of 4,4-diphenylmethane-bis(methacrylamide) (BisFenil), N,N¿,hexamethylene-bis(methacrylamide) (BisHexa), N,N¿-decamethylene-bis(methacrylamide) (BisDeca) and N,N¿-dodecamethylene-bis(methacrylamide) (BisDodeca). Methacrylate
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
-
23. Síntese e Estudo Termodinâmico em Adutos de Trihaletos de Antimônio e Bismuto com 2,2- Bipiridina e 1,10- Fenantrolina / SYNTHESIS AND THERMODYNAMIC STUDY IN ANTIMOMY AND BISMUTH TRICHOLRIDE ADDUCTS WITH 2,2-BIPYRIDINE AND 1,10-PHENANTROLINE
In this work were synthesized, characterized and studied experimentally and theoretically, the compounds of general formula [MX3 (L)], where M = Sb or Bi, X = Cl, Br, L = 2,2 -bipyridine (Bpy), 1,10-phenanthroline (Phen). The synthesized compounds were characterized by elemental analysis (C, H, N, Cl and Br), thermal analysis (TG / DTA) and absorption spectr
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/09/2010
-
24. Estudo do equilibrio solido-liquido em sistemas binarios de alcoois graxos atraves da calorimetria exploratoria diferencial / Solid-liquid equilibrium for fatty alcohols binary system by differential scanning calorimetry
Fatty alcohols are minor constituents of vegetal tissues, being mainly found in vegetal waxes. Fatty alcohols are used in industry as emulsifiers, surfactants or emollients agents. There are many studies about the use of fatty alcohol associated with fatty acids as substitutes for the hydrogenation process of margarine manufacturing and other edible emulsion
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 16/03/2010