Spectral and thermal analysis of aromatic diamines and anhydrides cured chalcone moiety containing epoxy resin of (2E,6E)-bis(4-hydroxybenzylidene)cyclohexanone

Author(s):  
Dharmesh B. Sankhavara ◽  
Jalpa V. Chopda ◽  
Jignesh P. Patel ◽  
Parsotam H. Parsania
2016 ◽  
Vol 721 ◽  
pp. 23-27 ◽  
Author(s):  
Ilya Kobykhno ◽  
Oleg Tolochko ◽  
Ekaterina Vasilyeva ◽  
Andrei Didenko ◽  
Danila Kuznetcov ◽  
...  

The paper experimentally studies the effect of meta and para- substitution of the amino groups in the diamine used in the synthesis of multiblock copolymers. The way for synthesis of new multiblock copolymers with the possibility of replacing the diamine in the polymer structure was shown. Thermal and mechanical properties of synthesized copolymers had been characterized by means of differential scanning calorimetry, thermogravimetric analysis, dynamic mechanical thermal analysis and by nanoindentation and tensile test.


MRS Advances ◽  
2018 ◽  
Vol 3 (63) ◽  
pp. 3811-3816
Author(s):  
Guillermo I. Meza-Mendoza ◽  
Dalia H. Chávez-García ◽  
Josué A. López Leyva ◽  
Miguel Ponce

ABSTRACTA thermoset polymer can be used for specific applications by creating a unique chemical composition that is designed for certain characteristic environments. To know the behavior of a thermoset polymer, it is necessary to thermally analyze its behavior during the curing process, as well as its mechanical behavior under certain loads that are applied in its field of application. In this study, the epoxy resin X was created at high temperatures, which there was no record of its thermal or mechanical behavior; the resin was analyzed to determine if it was possible to make a reduction in its curing cycle that was at temperature of 425° F with a time of 24 hours. As a result, through thermal analysis such as Differential Scanning Calorimetry (DSC), rheometry, Thermogravimetric Analysis (TGA) and Dynamic Mechanical Thermal Analysis (DMTA); as well as mechanical analysis, such as stress, hardness and planar cutting tests; it was possible to reduce the curing cycle of resin X, which is used in aerospace generators, from 24 hours at 425 ° F to 8 hours at 425 ° F. In the same way, this reduction of the cure cycle was verified by means of a qualification of a product that involved the reduction of the curing cycle of the epoxy resin obtaining very similar results to the original ones, verifying that the change of curing in the epoxy resin did not affected the functioning of the component. This methodology can be used and applied for the study of thermoset polymers that are used in several industries such as aerospace, automotive, among others.


2013 ◽  
Vol 116 (1) ◽  
pp. 27-33 ◽  
Author(s):  
G. N. Mathioudakis ◽  
A. C. Patsidis ◽  
G. C. Psarras

2012 ◽  
Vol 24 (8) ◽  
pp. 683-691 ◽  
Author(s):  
Cheng-Yuan Shang ◽  
Xiao-Juan Zhao ◽  
Xin Yang ◽  
Ying Zhang ◽  
Wei Huang

A novel epoxy resin containing trifluoromethyl and pendant polyfluorinted phenyl groups, 1,1-bis[4-(2,3-epoxypropoxy)phenyl]-1-(3,4,5-trifluorophenyl) -2,2,2-trifluoroethane (6FEP) was synthesized and characterized. The reactivtiy of 6FEP with two aromatic diamines, 4,4′-diaminodiphenyl methane (DDM) and 1,4-bis(4-amino-2-trifluoromethylphenoxy) benzene (6FAPB), and the properties of the cured 6FEP were investigated and compared with those of the commonly used epoxy resin diglycidyl ether of bisphenol A (DGEBA). The experimental results indicated that 6FEP showed lower reactivity than DGEBA. The cured 6FEP exhibited good thermal stabilities with decomposition temperature at 5% weight loss of 374–397°C, high glass transition temperature of 159–177°C and good mechanical properties. The cured 6FEP epoxy resin also showed low dielectric constants at 1 MHz in the range of 3.2–3.4 and dielectric dissipation factors (tan δ) in the range of 2.10–2.48 × 10−3. Moreover, the cured 6FEP epoxy resins exhibited higher surface hydrophobicity and lower moisture absorption compared with DGEBA. The improved dielectric properties and hydrophobic properties of the cured 6FEP epoxy resin could be attributed to the introduction of trifluoromethyl and pendant polyfluorinated phenyl groups into the molecular structure of the epoxy resin.


2014 ◽  
Vol 802 ◽  
pp. 590-595 ◽  
Author(s):  
Daniel Rodrigues ◽  
Gilberto V. Concílio ◽  
Elisa Pinto da Rocha ◽  
José A. de Castro ◽  
Marcos F. de Campos

NdFeB bonded magnets are produced by compression molding and curing. Typical raw materials are mixtures of epoxy resin and Nd2Fe14B flakes, produced mostly by melt spinning. The curing temperature should be adjusted for obtaining the best in terms of mechanical properties without overheating the pressed component. High curing temperatures can strongly oxidize Nd, generating more heat, and burning may occurs. The curing reaction is exothermic, thus the actual curing temperature will depend on the cured mass. This paper investigates this heating generation during curing, using DSC experimental apparatus.


1996 ◽  
Vol 54 (1) ◽  
pp. 67-83 ◽  
Author(s):  
Tania Dyakonov ◽  
Patrick J. Mann ◽  
Yan Chen ◽  
William T.K. Stevenson

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