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dc.contributor.advisorZuñiga, Alez Elíasen_US
dc.contributor.advisorHernández Ávila, Marceloen_US
dc.contributor.authorSánchez Sánchez, Xavieren_US
dc.date.accessioned2018-06-01T20:14:38Z
dc.date.available2018-06-01T20:14:38Z
dc.date.issued2017-12-05
dc.identifier.urihttp://hdl.handle.net/11285/630035
dc.description.abstractUltrasonic micro injection molding was confirmed to be an efficient processing technique for the fabrication of a well-filled miniaturized dog-bone shaped specimen of ultra-high molecular weight polyethylene (UHMWPE). The influence of parameters such as mold temperature, plunger velocity profile, vibrational amplitude, shape of raw material, is analyzed using techniques such as the Design of Experiments, and a methodological proposal. The influence of four process parameters on the filling phase of the reduced-size cavity was then analyzed . It was established that it is possible to fabricate well-defined specimens when the highest ultrasonic amplitude is applied intermittently at specific intervals during the ultrasonic process to small compacted irregularly shaped UHMWPE samples and the mold temperature is set to 100 °C. GPC results showed a decrease in the molecular weight, which was the greatest when 100% of the ultrasonic amplitude was applied. The degree of crystallinity of the processed sample was increased because the reduction of the molecular weight. TGA showed that the thermal stability of UHMWPE fabricated by ultrasonic processing was not significantly influenced by the decrease in the molecular weight. FTIR spectra indicated oxidative degradation in three different regions of the processed UHMWPE specimen. Additionally, the band identified at the wavenumber 910 cm-1 indicated a chain scission phenomenon the polymer experienced during the ultrasonic processing
dc.language.isoengen_US
dc.rightsRestricted Accessen_US
dc.titleApplication of ultrasonic micro injection molding for manufacturing of UHMWPE micropartsen_US
dc.typeTesis de Doctoradoes
thesis.degree.grantorInstituto Tecnológico y de Estudios Superiores de Monterreyes
thesis.degree.levelDoctor of Philosophy In Engineering Scienceen_US
dc.contributor.committeememberMartínez Romero, Oscaren_US
dc.contributor.committeememberSiller Carillo, Héctor Rafaelen_US
dc.contributor.committeememberPallacios, Luis Manuelen_US
thesis.degree.disciplineSchool of Engineering and Sciencesen_US
thesis.degree.nameDoctorado en Ciencias de la Ingenieríaen_US
dc.subject.keywordultrasonicen_US
dc.subject.keywordmicroi-injectionen_US
dc.subject.keywordmoldingen_US
dc.subject.keywordUHMWPEen_US
dc.subject.keywordengineeringen_US
thesis.degree.programCampus Monterreyen_US
dc.subject.disciplineIngeniería y Ciencias Aplicadas / Engineering & Applied Sciencesen_US
refterms.dateFOA2018-06-01T20:14:39Z
html.description.abstract<html> <head> <title></title> </head> <body> <p>Ultrasonic micro injection molding was confirmed to be an efficient processing technique for the fabrication of a well-filled miniaturized dog-bone shaped specimen of ultra-high molecular weight polyethylene (UHMWPE). The influence of parameters such as mold temperature, plunger velocity profile, vibrational amplitude, shape of raw material, is analyzed using techniques such as the Design of Experiments, and a methodological proposal. The influence of four process parameters on the filling phase of the reduced-size cavity was then analyzed . It was established that it is possible to fabricate well-defined specimens when the highest ultrasonic amplitude is applied intermittently at specific intervals during the ultrasonic process to small compacted irregularly shaped UHMWPE samples and the mold temperature is set to 100 &#176;C. GPC results showed a decrease in the molecular weight, which was the greatest when 100% of the ultrasonic amplitude was applied. The degree of crystallinity of the processed sample was increased because the reduction of the molecular weight. TGA showed that the thermal stability of UHMWPE fabricated by ultrasonic processing was not significantly influenced by the decrease in the molecular weight. FTIR spectra indicated oxidative degradation in three different regions of the processed UHMWPE specimen. Additionally, the band identified at the wavenumber 910 cm-1 indicated a chain scission phenomenon the polymer experienced during the ultrasonic processing</p> </body> </html>en_US


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