Modification of high ortho novolac resin with diacids to improve its mechanical properties

2007 ◽  
Vol 106 (1) ◽  
pp. 46-52 ◽  
Author(s):  
Tülin Banu İyim
Keyword(s):  
Mechanical Properties ◽  
Novolac Resin

Fire and mechanical properties of a novel free-radically cured phenolic resin based on a methacrylate-functional novolac and of its blends with an unsaturated polyester resin

RSC Advances ◽  
2015 ◽  
Vol 5 (43) ◽  
pp. 33772-33785 ◽  
Author(s):  
Baljinder K. Kandola ◽  
Latha Krishnan ◽  
Dario Deli ◽  
Piyanuch Luangtriratana ◽  
John R. Ebdon
Keyword(s):  
Mechanical Properties ◽  
Functional Groups ◽  
Phenolic Resin ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Unsaturated Polyester Resin ◽  
Novolac Resin ◽  
Methacryloyl Chloride

A novel free-radically curable phenolic novolac resin bearing methacrylate functional groups has been synthesized by reaction of the novolac with methacryloyl chloride.

Mechanical properties and structure of solvent processed novolac resin/layered silicate: development of interphase region

RSC Advances ◽  
2015 ◽  
Vol 5 (98) ◽  
pp. 80875-80883 ◽  
Author(s):  
Parisa Jahanmard ◽  
Akbar Shojaei
Keyword(s):  
Mechanical Properties ◽  
Layered Silicate ◽  
Novolac Resin ◽  
Modified Clays ◽  
Interphase Region ◽  
Organically Modified ◽  
Mixing Method ◽  
Silicate Layers

It was shown that the solution mixing method is able to disperse natural and organically modified clays in novolac resin efficiently. Development of a strong interphase region around the silicate layers was also explored.

Performance of Graphite Filled Composite Based on Benzoxazine Resin. II. Decreasing the Moulding Time of the Composite

2012 ◽  
Vol 20 (8) ◽  
pp. 717-724 ◽  
Author(s):  
Hajime Kimura ◽  
Keiko Ohtsuka ◽  
Akihiro Matsumoto
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Gas Permeability ◽  
Expanded Graphite ◽  
Bipolar Plate ◽  
Novolac Resin ◽  
Compression Moulding ◽  
Phenolic Resins ◽  
Cure Time ◽  
Filled Composite

To put the fuel cell to practical use, it is necessary to reduce its cost for the production of the bipolar plate as one of the components in the cell. Decreasing the moulding (cure) time of the graphite filled composites as a bipolar plate can increase its productivity. In this study, we aimed to decrease the moulding (cure) time of graphite-filled composites based on benzoxazine resin for the bipolar plate. Therefore, phenol novolac resin was added to benzoxazine resin as a curing accelerator. Expanded graphite was used for the preparation of the graphite-filled composites. The composites were prepared by means of the compression moulding of mixtures of graphite and benzoxazine resin containing phenol novolac as a curing accelerator. The properties of the graphite filled composites based on benzoxazine resin containing phenol novolac as a curing accelerator were characterised by mechanical properties, gas permeability and electrical conductivity. As a result, the curing reaction of benzoxazine resin containing phenol novolac as a curing accelerator could proceed more rapidly than that of only benzoxazine resin, and the moulding (cure) time of the composite was decreased. It was found that phenol novolac was an effective moulding accelerator of the graphite filled composites based on benzoxazine resin, and that it could increase the productivity of the bipolar plate using the graphite filled composite based on benzoxazine resin. It was also found that graphite filled composites based on benzoxazine resin containing phenol novolac as a curing accelerator showed good gas impermeability, electrical conductivity and mechanical properties compared with those of the graphite-filled composites based on the conventional phenolic resins.

Effects of novolac resin modification on mechanical properties of carbon fiber/epoxy composites

2010 ◽  
Vol 32 (2) ◽  
pp. 227-235 ◽  
Author(s):  
Hongwei He ◽  
Kaixi Li ◽  
Jianlong Wang ◽  
Jian Wang ◽  
Jianyu Gu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
Epoxy Composites ◽  
Novolac Resin ◽  
Carbon Fiber Epoxy

scholarly journals Improvement of the Mechanical Properties of Thermosetting-Binding-System-Based Composites by Means of Kneading Procedure Modification and Composite Formulation

Processes ◽  
2020 ◽  
Vol 8 (5) ◽  
pp. 625
Author(s):  
Adis Šahinović ◽  
Branka Mušič
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Thermal Properties ◽  
Raw Material ◽  
Great Success ◽  
Mechanical And Thermal Properties ◽  
Novolac Resin ◽  
Product Price ◽  
Binding System ◽  
Reduction Of Energy Consumption

By understanding the effects of the physical properties of individual input materials (e.g., binding system) on the physical and thermal properties of a composite material, the latter can be engineered in advance according to the desired properties and application. Often, a need to replace a specific component in a composite material arises, due to various reasons such as high raw material prices, product price reduction, environmental issues, improvement of properties, and others. In this study, we focused on the substitution of a phenolic novolac resin binding system and the reduction of compounding process temperature in combination with material throughput and screw speed variation of a phenolic-novolac-resin-based composite material, manufactured by kneading process using a co-kneader single screw extruder. Modifications were carried out in the interest of reducing production process cost and positive environmental effect due to reduction of energy consumption in the compounding process. We achieved great success in improvement of mechanical properties with all four substituted phenolic molding compounds (PMCs), while the decrease in thermal stability was the lowest for PMCs prepared at higher screw speeds and material throughput. The results indicated that higher screw speeds produce the best combination of mechanical and thermal properties of PMCs.

scholarly journals Investigation on the Flame Retardant Properties and Fracture Toughness of DOPO and Nano-SiO2 Modified Epoxy Novolac Resin and Evaluation of Its Combinational Effects

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1528 ◽  
Author(s):  
Markus Häublein ◽  
Karin Peter ◽  
Gökhan Bakis ◽  
Roi Mäkimieni ◽  
Volker Altstädt ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Heat Release ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Novolac Resin ◽  
Nano Sio2 ◽  
Char Layer ◽  
Flame Retardant Properties ◽  
Modified Epoxy

In this study, the flame-retardant, thermal and mechanical properties of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and nano-SiO2 modified epoxy novolac resin is evaluated, and the combinational effects of both additives are verified. As a hardener, an isophorone diamine (IPDA) and polyetheramine blend is stoichiometrically added to obtain a low viscous epoxy resin system, suitable for resin injection and infusion techniques. The glass transition temperature (Tg) and the silica dispersion quality is affected by the DOPO modification and the nano silica particles. The flame-retardant (FR) and mechanical properties of the additives are investigated separately. The fracture toughness could be increased with the incorporation of both FR additives; however, the effect is deteriorated for higher DOPO amount which is referred to silica particle agglomeration and consequently reduced shear yielding mechanism. Flame-retardant properties, especially the peak heat release rate (pHRR) and the total heat release (THR) could be decreased from 1373.0 kW/m2 of neat novolac to 646.6 kW/m2 measured by resins with varying phosphorous and silica content. Thermogravimetric analysis (TGA) measurements show the formation of a high temperature stable char layer above 800 °C which is attributed to both additives. Scanning electron microscopy (SEM) images are taken to get deeper information of the flame-retardant mechanism, showing a dense and stable char layer for a certain DOPO silica mixture which restrains the combustible gases from the burning zone in the cone calorimeter test and influences the fire behavior of the epoxy resin.

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