Solid State Polymerization
Mostrando 1-12 de 15 artigos, teses e dissertações.
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1. Effects of Temperature and Concentration on the Determination of PET Viscosity
This work describes the use of experiment planning to investigate the effects of the variables temperature and concentration of the polymer solution on the viscosity test of polyethylene terephthalate (PET). For this, the response surface methodology was based on a central composite rotatable design (CCRD) to optimize the combinations of the analytical condi
J. Braz. Chem. Soc.. Publicado em: 2020-09
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2. Use of Natural Deep Eutectic Solvents for Polymerization and Polymer Reactions
Green chemistry is a key opportunity in chemistry and chemical engineering today because it can potentially preserve the environment and human health. It entails the choice of natural biodegradable raw materials and solvents, environmentally acceptable processes, and minimal use of non-hazardous chemicals. Previously, deep eutectic solvents (DES) have found
J. Braz. Chem. Soc.. Publicado em: 2019-04
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3. Synthesis and characterization of the photoswitchable poly(methyl methacrylate- random-methacrylate spirooxazine)
Abstract The photoswitchable poly(methyl methacrylate-random-methacrylate spirooxazine) was synthesized via atom transfer radical polymerization with the feed mole ratio of MMA/MSp comonomer of about 5.5/1. Well-defined poly(methyl methacrylate- random-methacrylate spirooxazine) have been obtained with the average molecular weight (Mn) of 6500 g/mol and pol
Polímeros. Publicado em: 18/03/2019
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4. Design of a New Molecularly Imprinted Polymer Selective for Hydrochlorothiazide Based on Theoretical Predictions Using Gibbs Free Energy
A molecularly imprinted polymer (MIP) for the diuretic drug hydrochlorothiazide (HCTZ) based on theoretical predictions was developed. Molecular modeling calculations were performed to study the intermolecular interactions in the pre-polymerization mixture and to select a suitable functional monomer and a porogenic solvent for the synthesis of the MIP. To co
J. Braz. Chem. Soc.. Publicado em: 2016-12
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5. Polymerization of DL-Lactide induced by Protonated Montmorillonite clay as a solid catalyst: Mechanism study
Maghnite- H+ is Algerian montmorillonite sheet alumino-silicate clay, exchanged with protons (H+). This solid non-toxic catalyst was successfully used as cationic catalyst for the polymerization of D,L-Lactid at 100°C. Interactions between Maghnite-H+ platelets and the monomer (D,L-Lactide) were studied by solid state 1H, 27Al and 29Si NMR spectroscopy. The
Mat. Res.. Publicado em: 12/02/2016
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6. 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
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7. Solid state polymerization: its action on thermal and rheological properties of PET/PC reactive blends
The solid state polymerization (SSP) of PET/PC reactive extrusion blends - with and without cobalt catalyst - at different polymer ratios was studied. Thermal and rheological evaluations were performed. DSC results showed changes in the PET's Tg, Tch, Tm and Xc.. The melt flow rate (MFR) decreased for PET and the blends. The intrinsic viscosity increased. Th
Polímeros. Publicado em: 28/05/2013
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8. Pós-condensação no estado: uma abordagem para a reciclagem do PET / Post-condesation in solid: An approach fo recycling of PET
Dentre os polímeros mais consumidos pelo setor de embalagens alimentícias, encontra-se o poli (etileno tereftalato) (PET), especialmente no segmento de bebidas carbonatadas. Entretanto, as mesmas possuem um tempo de vida útil relativamente curto, e o seu descarte inadequado pode contribuir para o agravamento dos problemas ambientais. No Brasil, atualmente
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 03/08/2011
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9. Methodology to detect the presence of recyled PET in PET food package / Metodologia para detectar a presença do PET reciclado em embalagens PET para alimentos
Recently, Brazil recorded mechanical recycling of the poly (ethylene terepththalate), PET, the highest in the world, corresponding to about 53 wt %. This success in the recycling industry is due to the wide range of its applications, from textiles to packaging for the food industry. The recycled food-grade packaging could be mixed with virgin resin and repro
Publicado em: 2009
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10. Estudos e desenvolvimento de processos de pós condensação no estado sólido do PET reciclado / Studies and development of solid state polymerization process on poly(ethilene terephalate) recycled abstract
The increasing requirement of Ply(ethylene terephtalate) PET from the package market has made this available to the public discarded, quickly, since the technology of multi way package hasnt been possible due to high cost on the plant and its inadequate reuse. In the PET mechanical recycling, the most used way worldwide to recovery this material, the feature
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 04/12/2003
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11. Estudo comparativo entre observador de estado não-linear de alto ganho e calorimetria associada a redes neurais artificiais para previsão de composição de copolimeros produzidos em emulsão com altos teores solidos
High solid content lattices produced by emulsion polymerization have a great importance in the polymeric industry, not only for environmental reasons, since they usually have water as continuous phase, but also for economic motive, because these processes result in more polymeric material by volume of latex. The worry with the final application quality of th
Publicado em: 2003
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12. Fotoquímica de chalconas fluoradas no estado sólido
Chalcone and its fluorinated derivatives were synthesized and photolyzed in the solid state. UV irradiation of chalcone and its monosubstituted fluorine derivatives (3- and 4-fluorchalcone) resulted in a mixture of anti-head-head (gamma-truxinic), sin-head-tail (alpha-truxilic) and anti-head-tail (epsilon-truxilic) dimers. On the other hand, upon irradiation
Química Nova. Publicado em: 2002-02