Effects of post-curing on the thermo-mechanical behavior and the chemical structure of highly filled phenolic molding compounds

2016 ◽  
Vol 58 (1) ◽  
pp. 56-62 ◽  
Author(s):  
Thomas Scheffler ◽  
Sascha Englich ◽  
Ulrich Heyne ◽  
Michael Gehde
Keyword(s):  
Mechanical Behavior ◽  
Chemical Structure ◽  
Molding Compounds

Influence of Solvent Absorption on the Mechanical Behavior of SMC Laminates

1995 ◽  
Vol 14 (9) ◽  
pp. 988-1007 ◽  
Author(s):  
I. Etxeberria ◽  
Franco A. J. C. Valea ◽  
R. Llano-Ponte ◽  
I. Mondragon
Keyword(s):  
Mechanical Behavior ◽  
Chemical Structure ◽  
Polyester Resin ◽  
Aging Treatment ◽  
Engine Oil ◽  
Molding Compounds ◽  
Solvent Uptake ◽  
Solvent Absorption ◽  
Effects Of Aging ◽  
Influence Of Solvent

The effects of aging on sheet molding compounds (SMC) by immersion in water at 100°C, hexane at 70°C, benzene at 80°C, and engine oil at 60°C, have been investigated for two laminates with different styrene contents. Tests have been conducted under the above conditions for 9 days in order to follow the liquid uptake, and for 30 days to know the variation on the mechanical properties. The overall weight gain was found to be dependent on the chemical structure of the solvent used, and it was clearly higher in both laminates for aging treatment including a solvent able to interact with the polyester resin. Differences on solvent uptake were subsequently reflected in the mechanical behavior. The amount of solvent absorbed in the laminates made from endomaged molding compounds was clearly higher, and subsequently poorer the mechanical behavior, than that for those containing a higher content of styrene. This has been attributed to the lower crosslink density and to a higher amount of defects in the materials made from compounds with a low content of styrene. The influence of solvent desorption on the mechanical behavior has also been analysed.

Morphology and thermomechanical properties of epoxy composites highly filled with waste bulk molding compounds (BMC)

2015 ◽  
Vol 35 (8) ◽  
pp. 805-811 ◽  
Author(s):  
Danuta Matykiewicz ◽  
Mateusz Barczewski ◽  
Tomasz Sterzyński
Keyword(s):  
Chemical Structure ◽  
Low Cost ◽  
Thermomechanical Properties ◽  
Epoxy Composites ◽  
Mechanical And Thermal Properties ◽  
Scanning Calorimetry ◽  
Coating Materials ◽  
Molding Compounds ◽  
Dsc Method ◽  
Resin Curing

Abstract The aim of this study was to produce epoxy composites highly filled with waste bulk molding compounds (BMC). The used amount of filler ranged from 30 wt% to 60 wt%. The influence of BMC on the epoxy resin curing process was monitored with the differential scanning calorimetry (DSC) method. Fourier transform infrared (FTIR) spectroscopy was used to evaluate the chemical structure of composites. The mechanical and thermal properties were examined by means of dynamic mechanical thermal analysis (DMTA), the Charpy method and the Shore D test. The fracture surface morphology of composites was observed with scanning electron microscopy (SEM). The storage modulus G′ of the epoxy composites with BMC was higher than the reference epoxy sample and significantly dependent on filler content. All investigated materials showed similar values of hardness, but at the same time low values of impact strength. Therefore, obtained composites can be used as low cost coating materials.

Chemical structure and dynamic mechanical behavior of silk fibers modified with different kinds of epoxides

1994 ◽  
Vol 52 (8) ◽  
pp. 1037-1045 ◽  
Author(s):  
Hideki Shiozaki ◽  
Masuhiro Tsukada ◽  
Yoko Gotoh ◽  
Nobutami Kasai ◽  
Giuliano Freddi
Keyword(s):  
Mechanical Behavior ◽  
Chemical Structure ◽  
Silk Fibers ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior

Mechanical Behavior of Three Sheet Molding Compounds

2009 ◽  
pp. 113-113-20 ◽  
Author(s):  
DE Walrath ◽  
DF Adams ◽  
DA Riegner ◽  
BA Sanders
Keyword(s):  
Mechanical Behavior ◽  
Molding Compounds

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Inelastic Electron-Matter Interactions

1978 ◽  
Vol 36 (3) ◽  
pp. 259-267
Author(s):  
J. Silcox
Keyword(s):  
Electron Microscope ◽  
Energy Loss ◽  
Chemical Structure ◽  
Inelastic Electron ◽  
Primary Concern ◽  
Unique Probe ◽  
Introductory Paper ◽  
Elastic Processes ◽  
Experimental Level ◽  
Inelastic Processes

In this introductory paper, my primary concern will be in identifying and outlining the various types of inelastic processes resulting from the interaction of electrons with matter. Elastic processes are understood reasonably well at the present experimental level and can be regarded as giving information on spatial arrangements. We need not consider them here. Inelastic processes do contain information of considerable value which reflect the electronic and chemical structure of the sample. In combination with the spatial resolution of the electron microscope, a unique probe of materials is finally emerging (Hillier 1943, Watanabe 1955, Castaing and Henri 1962, Crewe 1966, Wittry, Ferrier and Cosslett 1969, Isaacson and Johnson 1975, Egerton, Rossouw and Whelan 1976, Kokubo and Iwatsuki 1976, Colliex, Cosslett, Leapman and Trebbia 1977). We first review some scattering terminology by way of background and to identify some of the more interesting and significant features of energy loss electrons and then go on to discuss examples of studies of the type of phenomena encountered. Finally we will comment on some of the experimental factors encountered.

Chemical structure of diamond-like carbon thin films

1990 ◽  
Vol 48 (4) ◽  
pp. 710-711
Author(s):  
N.-H. Cho ◽  
K.M. Krishnan ◽  
D.B. Bogy
Keyword(s):  
Electrical Resistivity ◽  
Chemical Structure ◽  
Diamond Like Carbon ◽  
Chemical Structures ◽  
Sputtering Power ◽  
Data Aquisition ◽  
Equilibrium Phases ◽  
Electron Energy Loss ◽  
Power Densities ◽  
Preparation Techniques

Diamond-like carbon (DLC) films have attracted much attention due to their useful properties and applications. These properties are quite variable depending on film preparation techniques and conditions, DLC is a metastable state formed from highly non-equilibrium phases during the condensation of ionized particles. The nature of the films is therefore strongly dependent on their particular chemical structures. In this study, electron energy loss spectroscopy (EELS) was used to investigate how the chemical bonding configurations of DLC films vary as a function of sputtering power densities. The electrical resistivity of the films was determined, and related to their chemical structure.DLC films with a thickness of about 300Å were prepared at 0.1, 1.1, 2.1, and 10.0 watts/cm2, respectively, on NaCl substrates by d.c. magnetron sputtering. EEL spectra were obtained from diamond, graphite, and the films using a JEOL 200 CX electron microscope operating at 200 kV. A Gatan parallel EEL spectrometer and a Kevex data aquisition system were used to analyze the energy distribution of transmitted electrons. The electrical resistivity of the films was measured by the four point probe method.

Sign in / Sign up

Export Citation Format

Share Document