Synthesis of high performance phosphorine antioxidants and their application to mCOC

Rwei, Syang‐Peng; Liu, Meng Long

doi:10.1007/s12221-008-0001-9

Cited by 3 publications

(4 citation statements)

References 16 publications

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“…Unsaturated bonds containing materials such as HTPB are the most affected categories of polymers by the thermal‐oxidation degradation due to the high reactivity of the unsaturated bond in the free radical . Therefore, the development of methods for inhibition of the oxidation process is remarked in many studies …”

Section: Introductionmentioning

confidence: 99%

“…26,27 Therefore, the development of methods for inhibition of the oxidation process is remarked in many studies. [28][29][30] The thermal-oxidative degradation of the materials is directly affected by the activation energy (E a ) of the decomposition reaction. Therefore, investigation of the E a value of degradation process could be assumed as a helpful method in evaluation of the antioxidant effect.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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The effect of the mixture of two antioxidants has been evaluated on the thermal‐oxidant degradation of the hydroxyl‐terminated polybutadiene (HTPB) because of its importance in the coatings and adhesives industries. 2,2‐Methylene bis(4‐methyl‐6‐tertiarybutylphenol) or A.O.2246 and 3‐hydroxy pyridine have been considered as antioxidants in this study as a common HTPB antioxidant and an active antioxidant, respectively. The thermal‐oxidant degradation behavior of the HTPB has been investigated in the presence of a mixture of two antioxidants by TGA and DTG tests, and, subsequently, the results of these tests have been interpreted by two model‐free methods, e.g., Kissinger–Akahira–Sunose and Friedman methods. The results revealed that the mixture of two antioxidants affected the activation energy of the thermal‐oxidant degradation reaction of the HTPB. The calculated activation energy value obtained from the Kissinger–Akahira–Sunose method was about 199 ± 1 kJ⋅mol−1. In addition, the Ea value at various conversion rates has also been calculated by using the Friedman method. This method showed that the highest Ea value in the thermal‐oxidant degradation reaction belonged to the initiation step of the reaction (about 299 kJ⋅mol−1). Moreover, the lowest activation energy value was correlated to the second step of the degradation reaction at a conversion rate of 0.6 (about 184 kJ⋅mol−1).

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Nazmi

Yarmohammadi

Pedram

et al. 2018

Int J of Chemical Kinetics

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“…They have potent antioxidant activity in several industrial areas such as: fuels and biofuels; tribology; polymers [5,6]; rubbers [7][8][9][10] and can be used in the biological industry too as antibacterial, anti-fungal and anti-tumor [11,12].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus cardanol: chemical characterization and thermal stability

et al. 2016

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Devido à grande utilização do cardanol para o desenvolvimento de novos aditivos, o presente trabalho tem como objetivos apresentar a caracterização química do fósforo cardanol, a qual foi verificada utilizando-se FTIR e técnicas termoanalíticas (TG/DSC/DTA) e, a avaliação antioxidante do composto em um óleo lubrificante de base naftênica. Neste trabalho, os autores incluíram também o estudo térmico do fósforo cardanol por aquecimento em estufa, com monitoramento das alterações em FTIR. De acordo com os resultados, o fósforo cardanol apresentou boa estabilidade térmica quando comparado a outros ésteres de fosfato de mesma classe e, não apresentou alterações antes e após aquecimento a 120 ° C, sob atmosfera de ar. Desta forma, o composto de fósforo obtido a partir do cardanol apresenta potencial de aplicação, como aditivo, em óleos lubrificantes e produtos petroquímicos do mesmo segmento. Palavras-chave: LCC, oxidação, estabilidade térmicaDue to the wide use of the cardanol to develop new additives, this study presents the chemical characterization of phosphorus cardanol using FTIR and Thermoanalytical techniques (TG / DSC / DTA), and the evaluation of the antioxidant potentiality of compound when added to a lubricating oil. In this paper, the authors also included the thermal study of phosphorus cardanol by heating in an oven, monitoring changes in FTIR. According to results, the phosphorus cardanol showed good thermal stability when compared with other compounds of the same class "phosphate esters" and showed no changes before and after heating at 120 ° C, under air atmosphere. Thus, the phosphorus compound derived from cardanol has potential application as additive for lubricating oils and petrochemicals of the same segment.

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“…[7][8][9][10][11][12] The authors' previous study demonstrates that the mCOC (metallocenebased cyclic olefin copolymer) fiber can be produced by the melt-spinning process with a particular quenching set-up. 13,14 Consequently, the mCOC fiber has become a potential replacement for glass fiber in high-frequency PCBs owing to its low dielectric constant -typically half of that of glass fiber. In this work, mCOC fibers are weaved to make mCOC fabric with the help of PVA (polyvinyl alcohol) fibers as a sheath layer.…”

mentioning

confidence: 99%

A flame-retardant copper-clad laminate composite made of (metallocenebased cyclic olefin copolymer/glass)/ cresol-novolak epoxy with low dielectricity

Rwei

Lin

Yeh

2014

Textile Research Journal

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A CNE (cresol-novolak epoxy) composite of CCL (copper-clad laminate), comprising glass fabrics and mCOC (metallocenebased cyclic olefin copolymer) fabrics with various laminated structures, was fabricated and its dielectricity at high frequency was examined. The dielectric constant, D k , at 5 GHz of a conventional glass/CNE composite is 4.0, whereas that of a seven alternately layered mCOC/glass/CNE composite with an externally facing mCOC layer is 2.3. In the same manner, the former has a loss tangent, D f , of 0.035, whereas the latter has a loss tangent, D f , of 0.007. In addition, the decrease of D f with increasing mCOC content is not linear but logarithmical. The T g (glass transition temperature) and scanning electron microscope results reveal the good compatibility of the mCOC and CNE at the interface between them. An optimal compression process, which involved a pressure of 20 kg/cm 2 at 185 C for 120 min, was followed by setting at 120 C for 30 min, to relax the residual stress that built up inside the mCOC prepregs, with the purpose of fabricating a mCOC/glass/CNE CCL without any tilt angle. The worsening of the flame retardancy that is caused by replacing some of the nonflammable glass layers with organic mCOC layers can be overcome by blending more 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide dicyandiamide hardener into the CNE matrix. The highest flameretardant standard, of grade UL 94 V0, can be achieved with a phosphorus content of the glass/CNE and glass/ mCOC/CNE CCLs of 8000 and 12,500 ppm, respectively. Briefly, a flame-retardant mCOC/glass/CNE composite of CCL operated at high frequency is successfully produced.

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Synthesis of high performance phosphorine antioxidants and their application to mCOC

Cited by 3 publications

References 16 publications

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Evaluation of the 3‐hydroxy pyridine antioxidant effect on the thermal‐oxidative degradation of HTPB

Phosphorus cardanol: chemical characterization and thermal stability

A flame-retardant copper-clad laminate composite made of (metallocenebased cyclic olefin copolymer/glass)/ cresol-novolak epoxy with low dielectricity

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