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Gamma Irradiation Effect on Nylon 6-12 Modification under Argon Atmosphere

材料科学与工程（中英文B版） 2012年第4期2卷 247-254页

作者： carmina menchaca Griselda Demesa Anabel Santiaguillo Gonzalo Martinez-Barrera Hetor Lopez-Valdivia Hetor Carrasco Jorge Uruchurtu Centro de Investigacion en Ingenieria y Ciencias Aplicadas （CIICAp） Universidad Aut6noma del Estado de Morelos Cuernavaca Morelos Mexico Laboratorio de Investigacion y Desarrollo de Materiales Avanzados （LIDMA） Facultad de Quimica Universidad Aut6noma del Estado de Mexico Edo. de Mexico Mexico Sintesis y Caracterizacion de Materiales Instituto Nacional de lnvestigaciones Nucleares Edo. de Mexico Mexico

Nylon is an important industrial material, and gamma irradiation is used for material modification. In this work, different gamma radiation dose were applied to crystalline fibres of nylon 6-12 at room temperature under argon atmosphere. Post-radiation effect was also studied, to know the effects of time. Some physical properties were measured obtaining the degree of modification with respect to the applied dose. X-ray values showed increment on the crystallinity and crystal size with dose increase up to 300 kGy. Brill Transition can be appreciated as a result of the in-situ X-ray with temperature study. Thermal analyses and AFM roughness measurements corroborate the modifying mechanisms in terms of the applied dose. For 15 and 50 kGy re-polymerization and crosslinking are the main mechanisms. Increment in the melting point at 15 kGy occurs, returning at 50 kGy to the original value. For 100 to 300 kGy the chain scission is the dominant mechanism because the melting point is lower than the original one. Both mechanisms take place in the amorphous zone.

关键词：改性尼龙辐射效应氩气保护伽玛辐射剂量原子力显微镜 γ射线辐照粗糙度测量

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Nylon/Porphyrin/Graphene Oxide Fiber Ternary Composite, Synthesis and Characterization

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Open Journal of Composite Materials 2017年第3期7卷 146-165页

作者： César García-Pérez carmina menchaca-Campos Miguel A. García-Sánchez Elsa Pereyra-Laguna Ociel Rodríguez-Pérez Jorge Uruchurtu-Chavarín Centro de Investigación en Ingeniería y Ciencias Aplicadas-IICBA Universidad Autónoma del Estado de Morelos Cuernavaca México Departamento de Química UAM Iztapalapa Vicentina México

This research was based on the manufacture of new composite materials that offer technological possibilities in the development of new devices with greater efficiency. Electrospinning was used to form nylon 66/-tetra-(para-aminophenyl) porphyrin (H2T(p-NH2)PP)/graphene oxide (GO) composite film. Graphene oxide coatings were obtained from graphite, through mechanical exfoliation followed by calcination and ultrasonic agitation in an oxidant solution. These samples were characterized under SEM, FTIR, Raman spectroscopy, UV-vis and R-X techniques. On the other hand, H2T(p-NH2)PP was synthesized in two steps?process by the Rothemun reaction and the Adler Method and it was integrated within nylon polyamide fibers by direct addition of a hexamethylenediamine/adipoyl chloride reactant mixture. The polymerization of the nylon/H2T(p-NH2)PP species occurs in such a way that it starts or ends on the four peripherals-NH2 groups, connected and located in the same molecular plane of H2T(p-NH2)PP, forming nylon chains at the periphery of the macrocycle. The association of GO with nylon/H2T(p-NH2)PP fibers is performed by dipole-dipole interaction and hydrogen bonding. To take advantage of the properties of these materials, they were combined as a ternary composite.

关键词： Electrospinning Composite Nylon Porphyrin Graphene Oxide

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Polymer Surface Roughness Determination throughout the Hurst Analysis from Optical Signal Measurements

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材料科学与工程（中英文版） 2010年第11期4卷 26-31页

作者： Antonio Marban Oscar Sarmiento-Martinez Darwin Mayorga-Cruz carmina menchaca Jorge Uruchurtu Centro de Investigaciones en Ingenieria y Ciencias Aplieadas-CIICAp Av Universidad 1001 Chamilpa Cuernavaca MorelosMexico Universidad Autonoma Metropolitana- UAM Azcapotzalco Avenida del Rosario Azcapotzalco Mexico D.F.

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Gamma-Irradiated Nylon Roughness as Function of Dose and Time by the Hurst and Fractal Dimension Analysis

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材料科学与工程（中英文版） 2010年第9期4卷 50-58页

作者： carmina menchaca Juan Carlos Nava Sofia Valdez Oscar Sarmiento-Martinez Jorge Uruchurtu Centro de Investigacion en lngenieria y Ciencias Aplicadas （CllCAp） Universidad Autonoma del Estado de Morelos Cuernavaea Morelos 62209 Mexico

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