Studies on thermal and morphological characteristics of E-glass/Kevlar 49 reinforced siliconized epoxy composites

Alagar, M.; Kumar, A. Ashok; Mahesh, K.P.O.; Dinakaran, K.

doi:10.1016/s0014-3057(00)00038-0

Cited by 62 publications

(52 citation statements)

References 7 publications

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“…It has 63 % of Kevlar/49 fibers and 37 % of glass/E fiber by weight, with grammage of 643 g/cm 2 and it has 487 Kgf and 343 Kgf of the breaking load (theoretical) of warp and weft, respectively, according to manufacturer's specification.…”

Section: Materials -Reinforcement and Resinmentioning

confidence: 99%

Polymer Composites Reinforced with Hybrid Fiber Fabrics

Felipe

Batista

et al. 2017

Mat. Res.

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In an effort to show the influence of the hybridization method in hybrid fabric reinforced composites within the characteristic of the fracture and the mechanical properties, two laminate reinforced with bi-directional woven were developed, where one of them was reinforced with a hybrid strand (hybrid strand composite laminate) and the other with a different strands (hybrid fabric composite laminate). Both laminates used polyester resin, Kevlar-49 and glass-E fibers, had four layers and were prepared industrially by hand lay-up manufacturing. The percentages by weight of fiberglass and Kevlar in each type of woven are equal. The hybrid strand composite laminate showed a higher tensile strength, however the hybrid fabric composite laminate showed superior properties in three-point bending test, for example, 41.7 % superiority in flexural strength. The results showed that the hybridization method in hybrid reinforced composites influences the mechanical behavior of laminates and the formation and spread of damage.

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Section: Materials -Reinforcement and Resinmentioning

confidence: 99%

Polymer Composites Reinforced with Hybrid Fiber Fabrics

Felipe

Batista

et al. 2017

Mat. Res.

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“…1 Dentre as formas de incorporação de siloxanos/silicone a políme-ros, o mecanismo que permite a formação de estruturas poliméricas interpenetrantes (Interpenetrating Polymer Networks -IPNs) proporciona a estabilidade de propriedades específicas que possibilitam ampliar o número de aplicações dos produtos assim modificados. [2][3][4][5][6] Numa estrutura polimérica interpenetrante ideal, duas ou mais estruturas poliméricas, quimicamente distintas e com elevado grau de ligações cruzadas dentro de suas cadeias, são mantidas unidas exclusivamente por seu entrelaçamento. No entanto, podem ocorrer situações em que somente um dos componentes apresente ligações cruzadas em sua estrutura polimérica ou, ainda, situações em que as ligações internas das cadeias poliméricas dos componentes não estão entrelaçadas, o que pode ocasionar separação de fases.…”

Section: Introductionunclassified

Revestimentos de alta camada obtidos com a modificação de resinas epóxi novolaca pela reação com organo-siloxano e catálise ácida

et al. 2016

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publicado na web em 12/10/2016 HIGH LAYER COATING OBTAINED IN THE REACTION OF MODIFIED NOVOLAC EPOXYS RESINS WITH ORGANOSILOXANES THROUGH ACID CATALYSIS. Epoxy resins are an important class of thermostable polymers, widely used in structural applications or as adhesives. However, the low fracture resistance is their main weakness in many applications. Due to this fact, this study aims to modify a polymer matrix based on a novolac epoxy resin with an organo siloxane (AMS). The final properties of cured epoxys resins are affected by the curing process and the coatings modified in this study with AMS and cured with acid catalyst presented greater resistance to thermal decomposition compared to that cured with Aradur, demonstrating a higher content of crosslinking in the siloxane polyether and the novolak epoxy resin chains. This epoxy matrix modified was used to prepare coatings whose films applied to 1020 steel surfaces presented a resistance of 10 10 Ohm-cm -2 . This resistance value is one order of magnitude greater than that of epoxy resins films modified by siloxanes in published studies, which demonstrates a potential economy in terms of maintenance costs of metal structures and machines used in power plants (UTE). To obtain the developed inks in pilot plant scale, it was used an aromatic polyamine as curing agent, characterizing the product obtained as an epoxy bi-component paint for commercial use.Keywords: Corrosion, novolac epoxy resin, interpenetrating polymer network-IPN, polyether siloxane, coatings. INTRODUÇÃOAs resinas epóxi são uma importante classe de polímeros termoestáveis, amplamente utilizadas em aplicações estruturais ou como adesivos, devido a suas características de alta tensão e módulo, fácil processamento, boa resistência química e térmica e alta aderência a muitos substratos. Os sistemas epóxi apresentam pequena contração após a cura (em média, 2%), o que indica a necessidade de um baixo grau de rearranjo molecular para formar o sistema curado. Quanto à estabilidade química, o epóxi é um dos termorrígidos mais inertes, além de possuir boa estabilidade dimensional. Entretanto, revestimentos à base de resinas epóxi apresentam hidrofobicidade, baixas resistência ao impacto e à exposição a ambientes abertos, estabilidade térmica relativamente baixa e, em muitas aplicações, sua principal desvantagem é sua baixa resistência à fratura. Por essas razões, as resinas epóxi são frequentemente modificadas buscando aprimorar suas características.Conforme estudo de Gu et al., 1 têm sido introduzidas nanopartículas inorgânicas (SiO 2 , ZrO 2 , ZnO) em matrizes epóxi que atuam preenchendo os defeitos, como microfissuras e vazios, do revestimento epóxi, com o intuito de aprimorar suas propriedades anticorrosivas modificando seu efeito como barreira física. A otimização de propriedades, principalmente mecânicas, das resinas epóxi e dos polímeros termofixos também pode ser alcançada pela modificação da estrutura do polímero, aumentando-se a cadeia em pontos de entrecruzamento. 2 De forma geral, a introdução...

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“…7 Major disadvantage for their application are their flammability 3,12 and low impact resistance. 8,13 The low pigment-holding ability and yellowing of epoxy resins further resist their wide application in paints and coatings. 6 Recently, numerous attempts at the toughening of epoxy resins have been made with, for example, carboxy-, amine-, or hydroxyl-terminated acrylonitrile butadiene rubbers, functionally terminated acrylates, poly(phenylene oxide), and alkylene oxide.…”

Section: Introductionmentioning

confidence: 99%

“…6 Recently, numerous attempts at the toughening of epoxy resins have been made with, for example, carboxy-, amine-, or hydroxyl-terminated acrylonitrile butadiene rubbers, functionally terminated acrylates, poly(phenylene oxide), and alkylene oxide. 4,5,8,9,13 Such modifications improve the impact behavior of epoxy resins; however, in some cases, the presence of a high level of unsaturations in their structure has been found to provide sites for degradative reactions, 9 and for some other modifications, these systems have been found to be unsuitable for high-performance engineering applications. 8,13 To overcome the drawbacks of such systems, extensive research efforts have been made to provide opportunities for the development of high-performance organic-inorganic hybrid polymers.…”

Section: Introductionmentioning

confidence: 99%

“…4,5,8,9,13 Such modifications improve the impact behavior of epoxy resins; however, in some cases, the presence of a high level of unsaturations in their structure has been found to provide sites for degradative reactions, 9 and for some other modifications, these systems have been found to be unsuitable for high-performance engineering applications. 8,13 To overcome the drawbacks of such systems, extensive research efforts have been made to provide opportunities for the development of high-performance organic-inorganic hybrid polymers. 3,[13][14][15][16][17][18] The combination of organic and inorganic siloxane functionalities in a single component offers diverse and unique properties such as good processability, flexibility, durability, and toughness and high thermooxidative stability to the resin, along with good abrasion resistance, hardness, chemical resistance, weatherability, and UV resistance.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis, formulation, and characterization of siloxane‐modified epoxy‐based anticorrosive paints

Ahmad

Ashraf

Sharmin

et al. 2006

J of Applied Polymer Sci

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Diglycidyl ether of bisphenol A epoxy (E) was modified with hydroxyl-terminated polydimethylsiloxane through a ring-opening addition polymerization reaction. The structural elucidation of the siloxane-modified epoxy resin (ES) was carried out with Fourier transform infrared, 1 H-NMR, and 13 C-NMR spectroscopy techniques. The physicochemical characterization of the synthesized resin (ES) was performed with standard methods. E and ES were subjected to paint formulation with the help of a rutile (TiO 2 ) pigment. The formulated paint systems were cured at room temperature with 1,6-diaminohexane (AH) and 1,3-diaminopropane (AP), which were used as curatives. The E-AH, E-AP, ES-AH, and ES-AP paint systems were applied to mild steel strips. The physicomechanical and anticorrosive performance of the coated panels was evaluated with standard methods. The thermal analysis of these E-amine and ES-amine systems was carried out via thermogravimetric analysis. The effects of siloxane incorporation and amine curatives on the coating properties of the paint systems were also investigated. The ES-AP system exhibited good thermal and corrosion stability performance among all the E and ES paint systems.

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Studies on thermal and morphological characteristics of E-glass/Kevlar 49 reinforced siliconized epoxy composites

Cited by 62 publications

References 7 publications

Polymer Composites Reinforced with Hybrid Fiber Fabrics

Polymer Composites Reinforced with Hybrid Fiber Fabrics

Revestimentos de alta camada obtidos com a modificação de resinas epóxi novolaca pela reação com organo-siloxano e catálise ácida

Synthesis, formulation, and characterization of siloxane‐modified epoxy‐based anticorrosive paints

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