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      Aplicación de la mecánica de la fractura post-cedencia a polímeros

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          Abstract

          La técnica del trabajo esencial de fractura (EWF) se ha utilizado en la caracterización a fractura de materiales que desarrollan una amplia ductilidad y donde ocurre una completa cedencia antes del inicio de la propagación de la grieta. De esta manera, la técnica EWF caracteriza la fractura post-cedencia determinando dos parámetros: el trabajo esencial específico de fractura (w e), relacionado con la superficie donde ocurre el proceso real de fractura, y el trabajo no esencial específico de fractura (w p), relacionado con el trabajo plástico realizado en la zona exterior de la zona de fractura. La técnica EWF ha sido utilizada satisfactoriamente, especialmente en polímeros, permitiendo el estudio de la influencia de distintas variables sobre el comportamiento a fractura. Su elevada sensibilidad así como su fácil aplicabilidad le confieren amplias ventajas sobre otras técnicas tales como la integral J. En este trabajo se describen los fundamentos de la técnica EWF y se recopilan algunos ejemplos de su aplicación, presentando un breve resumen de las aportaciones más relevantes realizadas por nuestro grupo de investigación sobre la técnica del EWF.

          Translated abstract

          The Essential Work of Fracture (EWF) technique has been used for the ductile materials characterization, where yielding phenomenon occurs before crack propagation. The EWF method characterizes the post-yielding fracture, determining two parameters: the specific essential work of fracture, w e related with the real fracture process area, and the specific non-essential work of fracture, w p that corresponds with the work done in the outer region of the crack tip. The EWF technique has been successfully employed especially with polymers, allowing the study of the influence of many variables on the fracture behavior, unavailable using other techniques such as J integral. In this work, the fundamentals of the technique and examples of application are reviewed, presenting a brief summary of the most relevant contributions of our group to the EWF method.

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          Biocompatible zwitterionic sulfobetaine copolymer-coated mesoporous silica nanoparticles for temperature-responsive drug release.

          A novel nanocontainer, which could regulate the release of payloads, has been successfully fabricated by attaching zwitterionic sulfobetaine copolymer onto the mesoporous silica nanoparticles (MSNs). RAFT polymerization is employed to prepare the hybrid poly(2-(dimethylamino)ethyl methacrylate)-coated MSNs (MSN-PDMAEMA). Subsequently, the tertiary amine groups in PDMAEMA are quaternized with 1,3-propanesultone to get poly(DMAEMA-co-3-dimethyl(methacryloyloxyethyl)ammonium propanesulfonate)-coated MSNs [MSN-Poly(DMAEMA-co-DMAPS)]. The zwitterionic PDMAPS component endows the nanocarrier with biocompatibility, and the PDMAEMA component makes the copolymer shell temperature-responsive. Controlled release of loaded rhodamine B has been achieved in the saline solutions.
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            Postpolymerization Modification of Hydroxyl-Functionalized Polymers with Isocyanates

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              Preparation and physical characterization of forms II and III of paracetamol

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rlmm
                Revista Latinoamericana de Metalurgia y Materiales
                Rev. LatinAm. Metal. Mater.
                Universidad Simón Bolívar (Caracas )
                0255-6952
                December 2010
                : 30
                : 2
                : 101-118
                Affiliations
                [1 ] Universitat Politècnica de Catalunya (UPC) España
                Article
                S0255-69522010000200002
                65dde9a8-2c64-4b95-894d-2266afa0b5f0
                Product
                Product Information: website
                Categories
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

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