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Effect of Nanofillers on the Mechanical Properties of Vinyl Ester Resin Used as a Carbon Fiber Reinforced Polymer Matrix

Kubit Andrzej, Bucior Magdalena, Kluz Rafał, Ochałek Krzysztof, Burnat Katarzyna

Advances in Science and Technology. Research Journal

2022

Vol. 16, no 4

10--21

This article presents the results of research aimed at determining the influence of selected nanofillers of vinyl ester resin on the mechanical properties of the cured resin. The influence of the resin with nanofillers as a matrix on the properties of the unidirectional CFRP composite was also investigated. Graphite, silicon oxide and titanium dioxide nanopowders were used as resin nanofillers. Each of the fillers was considered in two different contents, i.e. 1 wt.% and 2 wt.%. The variants with such nanofillers content were compared with the unfilled reference variant. The uniaxial tensile strength tests of the resin samples were carried out, showing the possibility of increasing the strength by 19.35% for the variant 1 wt.% of silica nanopowder content. For CFRP composites, the possibility of increasing the strength in the three-point bending test by 25.57% due to the use of a matrix reinforced with graphite nanopowder with a content of 1 wt.% was demonstrated. Based on the analysis of fracture surfaces performed using SEM microscopy, it was shown that the fillers used lead to a significant improvement in the adhesion of the matrix to the composite fibers.

Design, preparation and properties of novel flame retardant thermosetting vinyl ester copolymers based on castor oil and industrial dipentene

Mao W., Li S., Li M., Huang K., Xia J.

Polish Journal of Chemical Technology

2017

Vol. 19, nr 3

1--8

A novel bio-based flame-retardant thermosetting vinyl ester resin monomer was synthesized from castor oil. The chemical structures of the monomer was characterized by FTIR and 1H-NMR. In order to improve its rigidity and expand its application in the field of bio-based materials, it was mixed with certain proportions of another reactive bio-based VER monomer, which had rigid and strong polar groups, and then a series of copolymers were prepared with thermal curing method. Then their tensile property, hardness, morphology of fractured surface, flame retardant property, DMA and thermostability were all investigated. The results indicated that the copolymers had relatively high tensile strength of 11.2 MPa, and the limiting oxygen index is above 23% in all prepared copolymers. DMA demonstrates that the glass transition temperature of the cured resins is up to 56.1°C. Thermogravimetric analysis shows that the copolymers have excellent thermal stability.

Studies on Viscoelastic, Thermal and Morphological Properties of Vinyl Ester - Mixed Diluents System

Ranjan J. K., Raghu Raja Pandiyan K., Goswami S.

Archives of Metallurgy and Materials

2017

Vol. 62, iss. 3

1845--1850

Vinyl ester resin networks formed by using mixture of diluents were prepared. Methyl methacrylate (MMA) diluent was mixed in various proportions with vinyl ester resin which was already premixed with styrene diluent (45 wt. %). Weight ratios e.g. 80:20, 70:30 and 60:40 of VE resin: MMA diluents were studied. Viscoelastic properties of the cross-linked resin were studied by dynamic mechanical analyzer in terms of storage modulus and tanδ. Thermal analysis was performed using non-isothermal mode of Differential scanning calorimetry. The samples with mixed diluents, showed higher modulus, and glass transition temperature in comparison to that of the pure vinyl ester-styrene resin cross-linked in presence of styrene only. The difference in thermal stability between vinyl ester-styrene and vinyl ester-MMA-styrene was checked. Vinyl Ester – 20 wt. % MMA-Styrene samples have the best thermal property among all other prepared samples. Multiphase morphology was formed for the thermoset crosslinked with mixed diluents in contrast to that formed with single diluent. With increase in MMA content in the resin dispersed domain size increased.