Poly Propylene Glycol
Mostrando 1-9 de 9 artigos, teses e dissertações.
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1. Synthesis and characterization of amphiphilic block copolymers by transesterification for nanoparticle production
Abstract Poly(ε-caprolactone)-block-poly(ethylene glycol)-poly(ε-caprolactone) (PCL-PEG-PCL, triblock) and Poly(ε-caprolactone)-block-(poly(ethylene oxide)−poly(propylene oxide)−poly(ethylene oxide)-poly (ε-caprolactone) (PCL-PEO-PPO-PEO-PCL, pentablock) copolymers were synthesized by transesterification with reduction of PCL molecular mass, enabling
Polímeros. Publicado em: 04/07/2019
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2. Synthesis, Swelling Properties and Evaluation of Genotoxicity of Hydrogels Based on (Meth)acrylates and Itaconic Acid
In this study we prepared hydrogels based on 2-hydroxyethyl methacrylate (HEMA): PHEMA homopolymer and two terpolymers of HEMA, itaconic acid (IA) and two poly(alkylene glycol) (meth) acrylates (PAGM): poly(ethylene glycol)6 acrylate (P(HEMA/IA/PAGM1)) and poly(propylene glycol)5 methacrylate (P(HEMA/IA/PAGM2)). Hydrogels were synthesized by gamma-irradiated
Mat. Res.. Publicado em: 15/08/2016
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3. Estudo físico-químico de copoliéteres por viscosimetria / Physical-chemical study of copolyethers by viscosimetry
A viscosimetria é um procedimento experimental simples e pouco oneroso, que pode fornecer informações valiosas sobre o volume hidrodinâmico e a conformação de macromoléculas em solução, num determinado solvente, em uma dada temperatura. Os parâmetros viscosimétricos podem ser matematicamente calculados por extrapolação gráfica, cuja execução
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 23/07/2009
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4. Síntese e caracterização de dispersões aquosas de poliuretanos à base de copolímeros em bloco de poli(glicol etilênico) e poli(glicol propilênico)
Non-polluting polyurethane aqueous dispersions, with 40% of solids content, were synthesized based on block copolymers of poly(ethylene glycol) and poly(propylene glycol) (PEG-b-PPG), with PEG hydrophilic segments content of 7 and 25%, poly(propylene glycol) (PPG), dimethylolpropionic acid (DMPA), isophorone diisocyanate (IPDI), and hydrazine. Different form
Química Nova. Publicado em: 2008
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5. Estudo do efeito da adição de poli(glicol etilênico-b-glicol propilênico) na formação de dispersões aquosas poliuretânicas à base de poli(glicol propilênico) / Study of the effect of the copolymer poly(ethylene glycol-co-propylene glycol) addition on the polyurethane based poly(propylene glycol) aqueous dispersions formation
Non-polluting and poly(urethane-urea) aqueous dispersions based on poly(propylene glycol) (PPG) and block copolymers of poly(ethylene glycol-b-propylene glycol) (EG-b-PG) containing 7% of ethylene glycol repeating units, were produced in an innovative way. The poly(urethane-urea)s were prepared, in two steps, by the prepolymer method. In the first step, anio
Publicado em: 2007
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6. Estudo Viscosimétrico de Soluções de Pré-Polímeros Uretânicos à Base de Poli(Glicol Propilênico) e Diisocianato de Isoforona. / Viscometric study of urethanic prepolymers based on poly(propylene glycol) and isophorone diisocyanate.
Neste estudo, o comportamento em solução diluída de pré-polímeros uretânicos à base de poli(glicol propilênico) (PPG) e diisocianato de isoforona (IPDI) foi avaliado por medidas viscosimétricas a 30 C em dois tipos de solventes, com diferentes polaridades: isopropanol e tolueno. Os pré-polímeros foram sintetizados em massa, ou seja, na aus
Publicado em: 2006
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7. Adesivos poliuretanicos derivados de PET reciclado : sintese, caracterização e aplicação
In Brazil, the production and recycling index of poly(ethylene terephthalate) -PET have been increased. Therefore it is necessary to increase the possibilities for utilizing this polymer waste. This work aims the chemical recycling as a way to obtain value added products from PET waste. Postconsumer PET bottles were first depolymerized by glycolysis with die
Publicado em: 2004
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8. Membranas de poliamida para ultra-enanofiltração
The aim of this thesis is to prepare poliamide membranes for ultra- and nanofiltration processes, with lower susceptibility to fouling, by in situ poly- condensation. Composite membranes were prepared on a poly (vinylidene fluoride) (PVDF) porous support by two methods: (i) mixing amines and poliamines with a solution of polyether-block-polyamide copolymer (
Publicado em: 1995
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9. Estudo das relaxações de polimeros utilizando sondas luminescentes
Some relaxations of organic polymers were studied using luminescence probes dispersed in the polymers. We have studied the following polymers: poly(styrene), poly(vinyl acetate), poly(propylene), low density poly(ethylene) and poly(ethylene glycol)-600. Anthracene and benzophenone were dispersed in these polymers to analyse the temperature dependence on both
Publicado em: 1988