Effect of Epoxy Resin Addition on the Moisture Sensitivity of Macro Defect Free Polymer-Cement Composites

2011 ◽  
Vol 466 ◽  
pp. 65-72 ◽  
Author(s):  
Ozgur Ekincioglu ◽  
M. Hulusi Ozkul ◽  
Yoshihiko Ohama ◽  
Silvia Patachia ◽  
Georgeta Moise
Keyword(s):  
Bisphenol A ◽  
Epoxy Resins ◽  
Production Method ◽  
Diglycidyl Ether ◽  
Poly Vinyl Alcohol ◽  
Cement Pastes ◽  
Force Microscopy ◽  
Atomic Force ◽  
Roll Mill ◽  
Mdf Cements

Macro-defect-free (MDF) cements are cement-polymer composites and were developed by Birchall et al. three decades ago. The composites are produced by mixing small amounts of polymer and water with cement. However, they have a different production method than that of cement pastes, which was inspired by rubber production. Mixtures of cement, polymer and water are processed by using a two-roll mill. The composites are known with their high flexural strengths. Unfortunately, there are not any known commercial products using MDF cements because of their poor durability under moisture. In this study, MDF cements were prepared by using poly(vinyl alcohol--vinyl acetate) PVA, calcium aluminate cements and two different types of epoxy resins. Epoxy resins were a diglycidyl ether of bisphenol A and a mixture of a diglycidyl ethers of bisphenol A and F. Durability performance was compared with respect to biaxial flexural strengths, contact angle and atomic force microscopy (AFM) for the specimens stored in water.

Nucleation and Growth Behavior of Quaternary-Sputtered Copper Indium Gallium Diselenide Thin Films

2012 ◽  
Vol 1447 ◽  
Author(s):  
Jason D. Myers ◽  
Jesse A. Frantz ◽  
Robel Y. Bekele ◽  
Vinh Q. Nguyen ◽  
Allan Bruce ◽  
...  
Keyword(s):  
Rf Magnetron Sputtering ◽  
Production Method ◽  
Growth Behavior ◽  
Copper Indium Gallium Diselenide ◽  
Interfacial Layers ◽  
Force Microscopy ◽  
Alternative Technologies ◽  
Atomic Force ◽  
Columnar Grains ◽  
Grain Growth Behavior

AbstractIn the past two decades, the growing global demand for solar energy has spurred scientific interest in alternative technologies to conventional silicon. In particular, CuIn1-xGaxSe2 (CIGS) has emerged as a competitor. We have developed a scalable deposition technique using RF magnetron sputtering of quaternary CIGS. Notably, the resulting films do not require postselenization, reducing processing time and cost. We have fabricated devices above 10% efficiency using this approach, showing its promise as a production method for highperformance CIGS photovoltaics. However, the morphology of the sputtered CIGS layer is markedly different from conventional evaporated films; grain sizes vary through the thickness of the film, with numerous small grains dominating at the Mo/CIGS interface that then either terminate or grow in an inverted-pyramid fashion to form large, columnar grains at the CIGS/CdS interface.To better understand the origin of this morphology, we have studied the growth behavior of the CIGS layer using a combination of atomic force microscopy and electron microscopy to observe initial nucleation and grain growth behavior of quaternary-sputtered CIGS. We also discuss the effects of interfacial layers at the Mo/CIGS interface, demonstrating a novel wetting layer that conformally coats the Mo surface.

scholarly journals Sustainable access to fully biobased epoxidized vegetable oil thermoset materials prepared by thermal or UV-cationic processes

RSC Advances ◽  
2020 ◽  
Vol 10 (68) ◽  
pp. 41954-41966 ◽  
Author(s):  
Samuel Malburet ◽  
Chiara Di Mauro ◽  
Camilla Noè ◽  
Alice Mija ◽  
Marco Sangermano ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Epoxy Resin ◽  
Vegetable Oil ◽  
Epoxy Resins ◽  
Diglycidyl Ether

Beyond the need to find a non-toxic alternative to DiGlycidyl Ether of Bisphenol-A (DGEBA), the serious subject of non-epichlorohydrin epoxy resins production remains a crucial challenge that must be solved for the next epoxy resin generations.

Atomic force microscopy and nanoindentation of cement pastes with nanotube dispersions

2006 ◽  
Vol 203 (6) ◽  
pp. 1076-1081 ◽  
Author(s):  
Y. Sáez de Ibarra ◽  
J. J. Gaitero ◽  
E. Erkizia ◽  
I. Campillo
Keyword(s):  
Atomic Force Microscopy ◽  
Cement Pastes ◽  
Force Microscopy ◽  
Atomic Force

Thermal and Dielectric Properties of Inorganic-Organic Nanocomposites Involving Epoxy Resin and Polyhedral Oligomeric Silsesquioxanes

2012 ◽  
Vol 476-478 ◽  
pp. 665-669 ◽  
Author(s):  
Li Yang ◽  
Miao Yin ◽  
Xiu Yun Li ◽  
Han Bing Ma
Keyword(s):  
Thermal Stability ◽  
Dielectric Constant ◽  
Dielectric Properties ◽  
Bisphenol A ◽  
Epoxy Resin ◽  
Functional Groups ◽  
Epoxy Matrix ◽  
Epoxy Resins ◽  
Diglycidyl Ether ◽  
Polyhedral Oligomeric Silsesquioxanes

In this paper, a type of nanoporous polyhedral oligomeric silisesquioxanes (POSS) containing eight functional groups have been synthesized and mixed with diglycidyl ether of bisphenol A (DGEBA) to form epoxy resin networks with nanostructures. The cured octa(aminophenyl) silsesquioxane (1c-POSS) and DGEBA system inherently possesses higher thermal stability and higher char yield than the control epoxy resins. Furthermore, the dielectric constant of the 1c-POSS/DGEBA material (4.36) is substantially lower than that of the neat epoxy resins (4.64) as a consequence the presence of nanoporous POSS cubes in the epoxy matrix.

Graphene oxide as a catalyst for ring opening reactions in amine crosslinking of epoxy resins

RSC Advances ◽  
2016 ◽  
Vol 6 (28) ◽  
pp. 23858-23865 ◽  
Author(s):  
M. R. Acocella ◽  
C. Esposito Corcione ◽  
A. Giuri ◽  
M. Maggio ◽  
A. Maffezzoli ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Bisphenol A ◽  
Ring Opening ◽  
Epoxy Resins ◽  
Diglycidyl Ether ◽  
Epoxide Ring ◽  
Epoxide Ring Opening ◽  
Ring Opening Reactions

The influence of different graphite-based nanofillers on epoxide ring opening reactions, as induced by amines for diglycidyl ether of bisphenol A (DGEBA), is studied.

Curing dependent spatial heterogeneity of mechanical response in epoxy resins revealed by atomic force microscopy

Polymer ◽  
2015 ◽  
Vol 68 ◽  
pp. 1-10 ◽  
Author(s):  
Amir Bahrami ◽  
Xavier Morelle ◽  
Lê Duy Hông Minh ◽  
Thomas Pardoen ◽  
Christian Bailly ◽  
...  
Keyword(s):  
Atomic Force Microscopy ◽  
Spatial Heterogeneity ◽  
Epoxy Resins ◽  
Mechanical Response ◽  
Force Microscopy ◽  
Atomic Force
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