6330-01-4Relevant academic research and scientific papers
Cardanol based benzoxazine blends and bio-silica reinforced composites: Thermal and dielectric properties
Arumugam,Krishnan,Chavali,Muthukaruppan
, p. 4067 - 4080 (2018)
In the present work, a novel cardanol based benzoxazine was synthesised by reacting three different amines (aniline (CrAb), N,N-dimethylaminopropylamine (CrDb) and caprolactam modified N,N-dimethylaminopropylamine (CrCb)) with cardanol in the presence of formaldehyde under appropriate experimental conditions. The resulting benzoxazines were characterised for their molecular structure and thermal behaviour using different analytical methods. Among the different systems studied, the tertiary amine derivatives were found to reduce the curing temperature efficiently (CrAb-275 °C > CrDb-265 °C > CrCb-251 °C) and were confirmed by DSC analysis. These cardanol based CrAb benzoxazines were blended with conventional benzoxazines (Bzs) and bismaleimides (BMIs) as binary and ternary systems and their thermal properties were studied. Three different catalysts (4-hydroxy acetophenone, 4-aminophenol, and 4-hydroxyphenyl maleimide) were used to study the effect of lowering the curing temperature. Further, the prepared benzoxazines were reinforced with varying weight percentages (1, 3, 5 and 10 wt%) of bio-silica derived from rice husk to obtain hybrid composites. The dielectric studies of bio-silica reinforced cardanol benzoxazines infer that the values of dielectric constant decreased with increasing wt% of bio-silica. It was further observed that 10 wt% bio-silica reinforced cardanol benzoxazines show the lowest value of dielectric constant of 1.9 at 1 MHz. From the data obtained from the different studies, it is concluded that the blends of cardanol based benzoxazines can be used in the form of sealants, encapsulants, adhesives and matrices in the fields of microelectronics and automobile applications for better performance.
A facile and economical procedure for the synthesis of maleimide derivatives using an acidic ionic liquid as a catalyst
Li, Kai,Yuan, Chao,Zheng, Shijun,Fang, Qiang
experimental part, p. 4245 - 4247 (2012/08/28)
Seven maleimide derivatives were synthesized in good yields and high purity from the corresponding maleamic acids using a Bronsted acidic room temperature ionic liquid (RTIL) as a catalyst. The products were obtained through merely a decanting and removal of the solvent, suggesting that this procedure is superior to the conventional routes, in which the strong organic/inorganic acids were used as the catalysts, as well as a complicated post-processing procedure for the separation and purification of the products was employed.
Polydentate Carboxyamide Ligands as Analytical Reagents
Sarojini, T.,Ramachandraiah, A.
, p. 138 - 141 (2007/10/02)
Biphenyl bridged, binucleating and polydentate macromolecular ligand series, H2L, possessing two terminal -NH-CO-A-COOH, carboxyamide moieties (where A = -CH2-CH2- or -CH=CH- or ortho-phenylene linkage), has been synthesized and was found to be a set of p
