Results 21 to 30 of about 132 (119)

Estudo viscosimétrico de prepolímeros uretânicos

Polímeros, 2007
Neste trabalho, prepolímeros uretânicos à base de poli(glicol propilênico) (PPG) e diisocianato de isoforona (IPDI) foram sintetizados em massa e o comportamento das cadeias poliméricas em solução foi avaliado por medidas viscosimétricas, a 30 °C, em ...
Marcia C. Delpech, Fernanda M. B. Coutinho, Kenia G. M. Sousa, Rosângela C. Cruz   +3 more
doaj   +1 more source

IMPERMEABILIZAÇÃO DE RESERVATÓRIOS DE ÁGUA POTÁVEL COM POLIURETANO

RECIMA21 - Revista Científica Multidisciplinar - ISSN 2675-6218, 2022
Este trabalho tem o objetivo de realizar um estudo sobre a importância da impermeabilização de reservatórios de agua potável para o consumo humano, contendo informações sobre as normas da ABNT 12.170 e das diretrizes da portaria do ministério da saúde nº 2914/2011, quais as características de materiais utilizados para a correta impermeabilidade como, a
Robson Gaion Faustino dos Santos, Gerson De Marco, Fabiana Florian   +2 more
openaire   +1 more source

Metodología eficiente y compacta para la síntesis de Poliuretanos y Poliuretano-Ureas Segmentados

JOURNAL OF BASIC SCIENCES
Segmented polyurethane-ureas (PUU) are thermoplastic polymers used in tissue engineering due to their biocompatibility, biodegradability, and adjustable mechanical properties. PUU synthesis is carried out using the prepolymer method. In this work, an efficient and compact methodology for PUU synthesis was developed, employing PCL-diol, HMDI, and BDA ...
Carlos Daniel López Aguilar, Irma Sánchez Lombardo, Jorge Mauricio Paulin Fuentes, Rosendo López González, Rafael Omar Saavedra Díaz, Roberto Hernández Córdova   +5 more
openaire   +1 more source

Epoxidación enzimática de metil ésteres de ácidos grasos de origen vegetal y sus aplicaciones como alternativa para sustituir a los derivados del petróleo

TIP Revista Especializada en Ciencias Químico-Biológicas, 2019
Recientemente, la modificación de aceites vegetales para obtener ésteres metílicos de ácidos grasos (FAMEs) o biodiesel ha emergido como una alternativa para la sustitución de los derivados del petróleo, esto debido a los problemas ambientales y de salud
Alejandro Sustaita-Rodríguez, Beatriz Adriana Rocha-Gutiérrez, Antonio García-Triana, Víctor H. Ramos-Sánchez, Blanca G. Beltrán-Piña, David Chávez-Flores   +5 more
doaj   +1 more source

Comparison of polyurethane with cyanoacrylate in hemostasis of vascular injury in guinea pigs

Brazilian Journal of Cardiovascular Surgery, 2015
Objective: To evaluate the behavior of castor oil-derived polyurethane as a hemostatic agent and tissue response after abdominal aortic injury and to compare it with 2-octyl-cyanoacrylate. Methods: Twenty-four Guinea Pigs were randomly divided into three
Luiz Fernando Kubrusly, Marina Simões Formighieri, José Vitor Martins Lago, Yorgos Luiz Santos de Salles Graça, Ana Cristina Lira Sobral, Marianna Martins Lago   +5 more
doaj   +1 more source

Using disposable food packaging materials as printing, embedding, and sectioning media in the plant anatomy lab

Applications in Plant Sciences, Volume 12, Issue 2, March-April 2024.
Abstract Premise During the COVID‐19 pandemic lockdown, all laboratory work was suspended, and we were obliged to work from home, causing delays in our research. As the disruption to supply chains made it difficult to obtain our regular lab supplies, we were obliged to search for substitutes.
Guillermo Angeles, Carolina Madero‐Vega   +1 more
wiley   +1 more source

Poliuretano degradacijos biotechnologiniais metodais tyrimas

, 2020
Investigation of Polyurethane Degradation by Biotechnological Methods Management and recycling of plastic waste are one of the greatest challenges of the 21st century. Polyurethane (PU), in terms of production volumes, is the 5th plastic in Europe and the 7th in the world.
openaire   +2 more sources

Risk assessment of the diabetic foot and wound

International Wound Journal, Volume 2, Issue 1, Page 36-36, March 2005., 2005
Evaluation du risqué de plaie du pied diabétique Les plaies du pied diabétique sont parmi les complications les plus sévères du diabète, affectant jusqu’à 68 pour 1000 des patients présentant un diabète chaque année aux Etats‐unis. Plus de la moitié de ces patients va developper une infection et environ 20% d’entre eux vont nécessiter une amputation à ...
wiley   +1 more source

Síntese e caracterização de poliuretanos segmentados contendo blocos de peso molecular controlado: parte 1 preparação e caracterização dos materiais Synthesis and characterization of segmented polyurethanes containing blocks of controlled molecular weight: 1. Materials preparation and characterization

Polímeros, 1999
Um novo método de síntese de poliuretanos segmentados foi desenvolvido, no qual segmentos de características bem definidas foram preparados separadamente e acoplados em uma etapa seguinte.
C. L. Almeida, Leni C. Akcelrud
doaj   +1 more source

Evaluation of Tielle hydropolymer dressings in the management of chronic exuding wounds in primary care

International Wound Journal, Volume 2, Issue 1, Page 37-38, March 2005., 2005
Evaluation des pansements hydropolymère Tielle dans la prise en charge des plaies exsudatives en soins de proximité Le concept de cicatrisation en milieu humide n’est pas complètement compris en pratique quotidienne en Allemagne. C’est pourquoi l’objectif de cette etude était d’évaluer les pansements hydropolymères Tielle sur les plaies chroniques ...
wiley   +1 more source