Epoxy resin/polymer blends: Improvement of thermal and mechanical properties

Abstract

Fatty acid waste was recycled as raw material and utilized to synthesize epoxy (HP) or unsaturated ester group (OEE) containing polymers. The radicalic polymerization between the styrene and itaconic acid was carried out, too. Glycidyl ester of styrene‐itaconic acid copolymer was obtained by esterification reaction with epichlorohydrin. The polymers were characterized by means of Fourier transform infrared spectroscopy and chemical analysis. The polymers were incorporated into diglycidyl ether of bisphenol A type commercial epoxy resin to prepare composites. The effects of polymer structure and amount on the physico‐mechanical and thermal properties of epoxy were investigated. Surface hardness, tensile strength, percentage elongation and stress at maximum load of the composites were obtained higher than pure epoxy resin. The composites reinforced with bio‐based polymers showed about 74.55–243% increase in elastic modulus over the pure epoxy matrix. Obtained Young's modulus values were higher for composites with styrene‐based polymers. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Synthesis and thermal stability properties of boron‐doped silicone resin

“…The main weight loss was from 400°C to 500°C, followed by a further slight weight loss between 500 and 560°C, leaving a stabilized residue of 50.5% when the temperature is higher than 600°C. For BSR, the residue may be a mixture of silicon oxide and boron oxide …”

“…According to the results of TGA and DTG, we conclude that the thermal stability of the boron‐doped silicon resin has been greatly improved compared to the normal silicone resin. Such stability improvement might be explained by the formation of the SiOB bond network that protects the small groups of the side‐chains from a thermal decomposition . In addition, compared with SiO bond, the high bond energy of BO bond (514 kJ/mol) also contributes to the improvement of the thermal stability of resin.…”

“…To study the thermal stability of BSR more comprehensively, a series of samples doped with different degree of boron were examined by TGA. Degradation temperatures at 5, 10, and 50% weight loss of composites and the char residue at 800°C are given in Table , T 5% , T 10% , and T 50% are temperatures corresponding to 5, 10, and 50% weight loss, respectively, which are the main criteria indicating the thermal stability of the composites, the higher is the values, the higher is the thermal stability …”

Research progress on bio‐based thermosetting resins

“…It has been shown to be an excellent comonomer and is widely used as the primary source for emulsion paints and paper coating latexes . The carboxyls in its copolymers can also be grafted with epoxy groups by esterification with epichlorohydrin, and the obtained functional copolymers used to enhance the mechanical properties of DGEBA . Itaconic acid can directly react with epichlorohydrin to form an epoxy resin (EIA) containing double bonds .…”

Modification of the epoxy resin with epoxide and ester group containing oligomers and compounds

“…In our previous study, epoxy resin has been modified with the bio-based and styrene-based polymers. The results indicate that modification process enhances some properties of the epoxy resin such as surface hardness, tensile strength, percentage elongation, and stress at maximum load of the composites [8]. In this context, recent studies have shown that the addition of some modifying agents and additives into polymer matrices significantly affects their mechanical properties.…”