Abstract:The effects of oxirane groups in vinyl ester (VE) resin and reactive diluent on curing characteristics and thermal behavior of cured resins are described. Stoichiometric (0.5:1, sample A) as well as nonstoichiometric (0.5:0.85, sample B) ratios of the diglycidyl ether of bisphenol‐A (DGEBA) and methacrylic acid (MA) were used for the synthesis of VE resins. Resin sample B had more residual epoxy groups because of the stoichiometric imbalance of the reactants. VE resins thus obtained were diluted with methyl me… Show more
“…The TGA thermogram also shows a decomposition event in APEA between 300 and 500°C and 250 and 450°C in plain PEA. The comparative study highlights the higher thermal stability of APEA than plain PEA because of the incorporation of SMA copolymer; the presence of polystyrene moiety is imparting higher thermal stability17, 28–29 to the APEA resin.…”
Ambient-cured polyesteramide (APEA) coating resin synthesized from dihydroxy fatty amide obtained from linseed oil, a sustainable resource, and poly(styrene-co-maleic anhydride), a bifunctional acid component, was found to exhibit improved physicomechanical and anticorrosive properties. The structural elucidation of APEA resin has been carried out by FTIR, 1 H-NMR, and 13 C-NMR spectroscopies. The physicomechanical and chemical resistance properties were investigated by standard methods. The corrosion resistance performance was evaluated in acid, alkali, and organic solvent. The thermal behavior was studied by TGA technique. A comparative study of these properties of APEA with reported baked polyesteramide (PEA) coatings was carried out. A remarkable improvement in the drying property of APEA was observed. The APEA coatings also showed improved physicomechanical and anticorrosive properties as compared to the baked PEA coatings.
“…The TGA thermogram also shows a decomposition event in APEA between 300 and 500°C and 250 and 450°C in plain PEA. The comparative study highlights the higher thermal stability of APEA than plain PEA because of the incorporation of SMA copolymer; the presence of polystyrene moiety is imparting higher thermal stability17, 28–29 to the APEA resin.…”
Ambient-cured polyesteramide (APEA) coating resin synthesized from dihydroxy fatty amide obtained from linseed oil, a sustainable resource, and poly(styrene-co-maleic anhydride), a bifunctional acid component, was found to exhibit improved physicomechanical and anticorrosive properties. The structural elucidation of APEA resin has been carried out by FTIR, 1 H-NMR, and 13 C-NMR spectroscopies. The physicomechanical and chemical resistance properties were investigated by standard methods. The corrosion resistance performance was evaluated in acid, alkali, and organic solvent. The thermal behavior was studied by TGA technique. A comparative study of these properties of APEA with reported baked polyesteramide (PEA) coatings was carried out. A remarkable improvement in the drying property of APEA was observed. The APEA coatings also showed improved physicomechanical and anticorrosive properties as compared to the baked PEA coatings.
“…The free-radical curing behavior is generally depended on the resin structure, the type and amount of reactive diluent and the initiator. 39 In this work, all of the mentioned factors except for the main structure of the resins are the same. As it is clear from Figure 4, the highest enthalpy of curing (i.e.…”
Section: Curing Studies By Dscmentioning
confidence: 99%
“…Such etherification reactions are reported for epoxy resins at higher temperatures. 39 The endothermic removing of water has decreasing influence on the overall curing enthalpy. Such phenomenon is more noteworthy for AESSO comparing to VE due to its more pendant OH groups (Figure 1(b)).…”
This study deals with the synthesis of vegetable oil (VO)-derived formulated resins with high bio-based content (30–77%) as potential renewable alternatives to conventional fossil-based vinyl ester (VE) and unsaturated polyester (UP) resins. First, epoxy acrylate was synthesized from a commercial epoxy resin via acrylation with acrylic acid. Then, acrylated epoxidized sesame oil (AESSO) and maleated castor oil (MCO) were synthesized and spectrally characterized. Afterward, networks of VE, AESSO, and MCO or their binary blends were prepared. The curing trend of the resins was investigated by differential scanning calorimetry. According to thermal and thermomechanical analysis, all of the VO-based networks possessed slightly inferior properties compared to those of VE. However, the adhesion strength of the VO-based alloying systems was higher than that of their petroleum-based counterpart based on T-peel and lap shear tests. Overall, it was concluded that the bio-resourced alloys could be considered as good alternatives to VE and UP resins, and the novel bio-resin formulations may be designed for adhesives, the polymer–matrix composites, and surface coating applications.
“…The major problem with rubber toughening is that the particle size of the functional rubbers can hardly be controlled via phase separation during the very fast copolymerization/crosslinking reaction. To modify the network density, either the type of VE (chemical buildup and molecular mass) or the comonomer (buildup and reactivity) should be varied 33–36. A recent strategy is to use functional hyperbranched polymers or star‐shaped polymers (SSPs) as toughness modifiers, which usually have epoxy and amine functionalities 37–41.…”
ABSTRACT:The morphology-toughness relationship of vinyl ester resins was studied as a function of their modification. Bisphenol A based and novolac-based vinyl ester resins were modified by a star-shaped polyether polymer with vinyl and hydroxyl functionalities and/or by a polyisocyanate. The polyisocyanate-containing systems were termed vinyl ester/urethane hybrids. The morphology of the crosslinked resins was studied with dynamic mechanical thermal analysis and atomic force microscopy with ioneroded specimens and discussed. The toughness of the crosslinked resins was assessed by the linear elastic fracture mechanics with compact tension specimens. The fracture toughness and energy changed fairly linearly as functions of M c and M c 0.5 , respectively, where M c is the mean molecular mass between crosslinks.
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