scholarly journals A Comparative Study of the Photodegradation of Two Series of Cyclic Olefin Copolymers

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Mario H. Gutiérrez-Villarreal ◽  
Sara A. Zavala-Betancourt
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Tensile Properties ◽  
Uv Light ◽  
Extrusion Process ◽  
Accelerated Weathering ◽  
Carbonyl Index ◽  
Cyclic Olefin ◽  
Cyclic Olefin Copolymers ◽  
Higher Sensitivity

A series of commercial cyclic olefin copolymers (COC), namely, ethylene-norbornene (E-NB) and ethylene-tetracyclododecene (E-TD), were processed as thin films with thicknesses of 25 μm by an extrusion process. The photodegradation of neat and formulated films with different metal stearates (Fe, Co, and Mn) was investigated using an ultraviolet (UV) light lamp (340 nm) for a period of 30 days in an accelerated weathering tester model QUV from Q-LAB according to the ASTM D 5208-01 standard practice. Changes in carbonyl index (CI) and tensile properties were used to evaluate the photodegradation of the films and other properties, such as Tg variation by DSC, were also analyzed. The present study reveals that (E-NB) copolymers show higher sensitivity to photodegradation than (E-TD) resins, in the absence and presence of metal stearates. We also find that the Fe salt shows the highest oxidative activity.

Tensile properties of magnetron sputtered aluminum–scandium and aluminum–zirconium thin films: A comparative study

2013 ◽  
Vol 215 ◽  
pp. 369-375 ◽  
Author(s):  
Julien Kovac ◽  
Heinz-Rolf Stock ◽  
Bernd Köhler ◽  
Hubert Bomas ◽  
Hans-Werner Zoch
Keyword(s):  
Thin Films ◽  
Comparative Study ◽  
Tensile Properties

Possible Mechanism of the 30–100 Picoseconds Fast and Efficient Photoluminescence From nc-Si/a-SiO2Doped with Transition Metals

1996 ◽  
Vol 452 ◽  
Author(s):  
S. Veprek ◽  
Th. Wirschem ◽  
J. Dian ◽  
S. Perná ◽  
R. Merica ◽  
...  
Keyword(s):  
Thin Films ◽  
Energy Transfer ◽  
Transition Metals ◽  
Comparative Study ◽  
Silicon Nanocrystals ◽  
Light Emission ◽  
Uv Light ◽  
Charge Carriers ◽  
Radiative Center ◽  
Insight Into

AbstractThe nc-Si/a-SiO2composite thin films doped with tungsten show very fast and efficient photoluminescence (PL). In order to obtain insight into the PL mechanism we have performed a comparative study with other metals. The results lend support to the suggested mechanism which includes the photogeneration of charge carriers due to efficient absorption of the excitation UV light in the silicon nanocrystals followed by energy transfer to the Wn+radiative center from which the light emission occurs.

Comparative study on tensile properties and microstructure development in elastomer-modified cyclic olefin copolymer

2014 ◽  
Vol 22 (3) ◽  
pp. 222-230 ◽  
Author(s):  
Seyed Hassan Jafari ◽  
Hossein Ali Khonakdar ◽  
Mohammad Tarameshlou ◽  
Mohammad Reza Saeb
Keyword(s):  
Comparative Study ◽  
Tensile Properties ◽  
Cyclic Olefin Copolymer ◽  
Microstructure Development ◽  
Cyclic Olefin

scholarly journals Electron microscopy analysis of biofilms produced by Staphylococcus aureus exposed to UV-light on the surface of SnO2 thin films

2021 ◽  
Vol 27 (S1) ◽  
pp. 3168-3170
Author(s):  
Hazel Jaynelle Morales-Rodriguez ◽  
Javier Camarillo-Cisneros ◽  
María Alejandra Favila-Pérez ◽  
Alva Rocío Castillo-González ◽  
Celia María Quiñonez-Flores ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Staphylococcus Aureus ◽  
Uv Light ◽  
Electron Microscopy Analysis ◽  
Microscopy Analysis ◽  
Sno2 Thin Films

scholarly journals Biofilm integrity and cytomorphology of Candida albicans after exposure to UV-light on ZnO thin films: SEM Analysis

2021 ◽  
Vol 27 (S1) ◽  
pp. 1896-1898
Author(s):  
Carlos Arzate-Quintana ◽  
César Leyva-Porras ◽  
María Alejandra Favila-Pérez ◽  
Alva Rocío Castillo-González ◽  
Celia María Quiñonez-Flores ◽  
...  
Keyword(s):  
Thin Films ◽  
Candida Albicans ◽  
Uv Light ◽  
Sem Analysis ◽  
Zno Thin Films

Photocatalytic performance of Cu-doped titania thin films under UV light irradiation

2021 ◽  
Vol 553 ◽  
pp. 149535
Author(s):  
Elisa Moretti ◽  
Elti Cattaruzza ◽  
Cristina Flora ◽  
Aldo Talon ◽  
Eugenio Casini ◽  
...  
Keyword(s):  
Thin Films ◽  
Photocatalytic Performance ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Doped Titania
Sign in / Sign up

Export Citation Format

Share Document