Phase separation, porous structure, and cure kinetics in aliphatic epoxy resin containing hyperbranched polyester

2006 ◽  
Vol 44 (6) ◽  
pp. 889-899 ◽  
Author(s):  
Qipeng Guo ◽  
Alexia Habrard ◽  
Yoosup Park ◽  
Peter J. Halley ◽  
George P. Simon
Keyword(s):  
Phase Separation ◽  
Porous Structure ◽  
Epoxy Resin ◽  
Cure Kinetics ◽  
Hyperbranched Polyester

scholarly journals Effect of Terminal Groups on Thermomechanical and Dielectric Properties of Silica–Epoxy Composite Modified by Hyperbranched Polyester

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2451
Author(s):  
Jianwen Zhang ◽  
Dongwei Wang ◽  
Lujia Wang ◽  
Wanwan Zuo ◽  
Lijun Zhou ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Binding Energy ◽  
Epoxy Resin ◽  
Volume Fraction ◽  
Epoxy Composite ◽  
Mean Square Displacement ◽  
Mean Square ◽  
Hyperbranched Polyester ◽  
Free Volume Fraction

To study the effect of hyperbranched polyester with different kinds of terminal groups on the thermomechanical and dielectric properties of silica–epoxy resin composite, a molecular dynamics simulation method was utilized. Pure epoxy resin and four groups of silica–epoxy resin composites were established, where the silica surface was hydrogenated, grafted with silane coupling agents, and grafted with hyperbranched polyester with terminal carboxyl and terminal hydroxyl, respectively. Then the thermal conductivity, glass transition temperature, elastic modulus, dielectric constant, free volume fraction, mean square displacement, hydrogen bonds, and binding energy of the five models were calculated. The results showed that the hyperbranched polyester significantly improved the thermomechanical and dielectric properties of the silica–epoxy composites compared with other surface treatments, and the terminal groups had an obvious effect on the enhancement effect. Among them, epoxy composite modified by the hyperbranched polyester with terminal carboxy exhibited the best thermomechanical properties and lowest dielectric constant. Our analysis of the microstructure found that the two systems grafted with hyperbranched polyester had a smaller free volume fraction (FFV) and mean square displacement (MSD), and the larger number of hydrogen bonds and greater binding energy, indicating that weaker strength of molecular segments motion and stronger interfacial bonding between silica and epoxy resin matrix were the reasons for the enhancement of the thermomechanical and dielectric properties.

Developments in the Field of Rapid Prototype Production

2008 ◽  
Vol 589 ◽  
pp. 421-425 ◽  
Author(s):  
Norbert Krisztián Kovács ◽  
József Gábor Kovács
Keyword(s):  
Mechanical Strength ◽  
Porous Structure ◽  
Epoxy Resin ◽  
Rapid Prototype ◽  
Post Treatment ◽  
3D Printer ◽  
Infiltration Depth ◽  
3D Printed ◽  
The Common ◽  
Polymer Engineering

Characteristics of 3D printed specimens are porous structure and low mechanical strength. Due to porous structure post treatment is possible, and in most cases infiltration with an epoxy resin, wax or cyanoacrylate material takes place. As a result of post treatment, the mechanical strength can be increased by 100%, although this is strongly influenced by the infiltration depth that depends on the porous structure and the resin viscosity. In the framework of the common research of the Department of Polymer Engineering, BME and Varinex Zrt. the applicability of a 3D printer is examined in the field of direct tool making. As the first step, the resin uptake ability of specimens prepared with a Z810 3D printer is examined.

Investigating the relationship between tack and degree of conversion in DGEBA-based epoxy resin cured with dicyandiamide and diuron

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ali Kuliaei ◽  
Iraj Amiri Amraei ◽  
Seyed Rasoul Mousavi
Keyword(s):  
Epoxy Resin ◽  
Reaction Order ◽  
Theoretical Data ◽  
Cure Kinetics ◽  
Diglycidyl Ether ◽  
Degree Of Conversion ◽  
Ozawa Method ◽  
Heating Rates ◽  
Scanning Calorimetry ◽  
Kinetics Of

Abstract The purpose behind this research was to determine the optimum formulation and investigate the cure kinetics of a diglycidyl ether of bisphenol-A (DGEBA)-based epoxy resin cured by dicyandiamide and diuron for use in prepregs. First, all formulations were examined by the tensile test, and then, the specimens with higher mechanical properties were further investigated by viscometry and tack tests. The cure kinetics of the best formulation (based on tack test) in nonisothermal mode was investigated using differential scanning calorimetry at different heating rates. Kissinger and Ozawa method was used for determining the kinetic parameters of the curing process. The activation energy obtained by this method was 71.43 kJ/mol. The heating rate had no significant effect on the reaction order and the total reaction order was approximately constant ( m + n ≅ 2.1 $m+n\cong 2.1$ ). By comparing the experimental data and the theoretical data obtained by Kissinger and Ozawa method, a good agreement was seen between them. By increasing the degree of conversion, the viscosity decreased; as the degree of conversion increased, so did the slope of viscosity. The results of the tack test also indicated that the highest tack could be obtained with 25% progress of curing.

Cure kinetics of epoxy resin and thermoplastic polymer

2006 ◽  
Vol 86 (3) ◽  
pp. 699-705 ◽  
Author(s):  
Marta Sánchez-Cabezudo ◽  
Margarita G. Prolongo ◽  
Catalina Salom ◽  
Rosa M. Masegosa
Keyword(s):  
Epoxy Resin ◽  
Cure Kinetics ◽  
Thermoplastic Polymer ◽  
Kinetics Of

Viscoelastic Effects on the Phase Separation in Thermoplastics-Modified Epoxy Resin

2003 ◽  
Vol 36 (20) ◽  
pp. 7746-7751 ◽  
Author(s):  
Wenjun Gan ◽  
Yingfeng Yu ◽  
Minghai Wang ◽  
Qingsheng Tao ◽  
Shanjun Li
Keyword(s):  
Phase Separation ◽  
Epoxy Resin ◽  
Viscoelastic Effects ◽  
Modified Epoxy

Cure Kinetics of Epoxy Resin System Toughened by Polyhexamethylene Carbonate Diol

1997 ◽  
Vol 13 (09) ◽  
pp. 848-852
Author(s):  
Chen Tong-Hui ◽  
◽  
Bai Yao-Wen ◽  
Sun Ren-Hui
Keyword(s):  
Epoxy Resin ◽  
Cure Kinetics ◽  
Resin System ◽  
Epoxy Resin System ◽  
Kinetics Of

Cure kinetics of biphenyl epoxy resin system using latent catalysts

2001 ◽  
Vol 81 (11) ◽  
pp. 2711-2720 ◽  
Author(s):  
Whan Gun Kim ◽  
Ho Gyu Yoon ◽  
Jun Young Lee
Keyword(s):  
Epoxy Resin ◽  
Cure Kinetics ◽  
Resin System ◽  
Epoxy Resin System ◽  
Kinetics Of
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