Flame-retardant epoxy resins from novel phosphorus-containing novolac

Liu, Ying‐Ling

doi:10.1016/s0032-3861(00)00717-5

Cited by 277 publications

(196 citation statements)

References 33 publications

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“…1,2 Much work has been done in an attempt to make epoxy resin more flame retardancy and great progress has been achieved so far. [3][4][5][6][7][8][9][10] At present, with the consideration of avoiding the generation of toxic and halogenated gases, the trend is toward using environment-friendly flame retardant to modify the epoxy resins. One example is the use of organophosphorus, which shows evident effectiveness as a flame retardant.…”

mentioning

confidence: 99%

“…Moreover, due to the limit from chemical structures in molecular design during the introduction of phosphorus, the low crosslink density of the cured epoxy resin often decreases T g of the epoxy resin. 9,10 According to a previous report, 11 the flame retardancy of phosphorus could be improved if providing an environment to reduce the thermal oxidation of phosphorus char at the high temperature region. Organosiloxanes possess many properties, including hydrophobic property, non-flammability, excellent thermo-oxidative stability and electronic property, which can compensate for the disadvantages of phosphorus flame retardant.…”

mentioning

confidence: 99%

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Studies on the Thermal Properties and Flame Retardancy of Epoxy Resins Modified with Polysiloxane Containing Organophosphorus and Epoxide Groups

Hou

Liu

et al. 2007

Polym J

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ABSTRACT:A novel epoxy resin modifier, phosphorus-containing epoxide siloxane (PES) with pendant epoxide and cyclic phosphorus groups on the side chain of the polysiloxane backbone, was synthesized by the ring-opening reaction of epoxy-siloxane with 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO). PES was characterized by 1 H NMR and FT-IR measurements, and then it was employed to modify an epoxy resin at various ratios via prereaction with 4, 4 0 -diaminodiphenyl-methane (DDM) as curing agent. In order to compare with the epoxy resins modified with PES, DOPO-containing epoxy resins also cured under the same conditions. The thermal, thermomechanical, and flame-retardant properties of all cured polymers were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), the limited oxygen index (LOI) and cone calorimetry. The results showed that the epoxy resins modified with PES exhibited much better thermal properties and flame retardancy than the DOPO-containing epoxy resins at the same phosphorus content and the neat epoxy resin. In recent years, epoxy resins have been widely used in coatings, adhesives, aerospace and electronic industries, especially in microelectronic field. However, with the rapid development of electronic technology, the heat resistance and flame retardancy of conventional epoxy resins couldn't meet the requirements of these applications. 1,2 Much work has been done in an attempt to make epoxy resin more flame retardancy and great progress has been achieved so far. [3][4][5][6][7][8][9][10] At present, with the consideration of avoiding the generation of toxic and halogenated gases, the trend is toward using environment-friendly flame retardant to modify the epoxy resins. One example is the use of organophosphorus, which shows evident effectiveness as a flame retardant. [4][5][6][7][8] However, this increase in flame retardancy is always accompanied by a decrease in the initial decomposition temperature, which makes the modified epoxy resins unfit for those applications requiring critical thermal stability. Moreover, due to the limit from chemical structures in molecular design during the introduction of phosphorus, the low crosslink density of the cured epoxy resin often decreases T g of the epoxy resin. 9,10 According to a previous report, 11 the flame retardancy of phosphorus could be improved if providing an environment to reduce the thermal oxidation of phosphorus char at the high temperature region. Organosiloxanes possess many properties, including hydrophobic property, non-flammability, excellent thermo-oxidative stability and electronic property, which can compensate for the disadvantages of phosphorus flame retardant. Thus, organosiloxanes would be one of choices for enhancing the flame retardancy and heat resistance. [12][13][14] In this paper, a novel modifier for epoxy resins, epoxy oligomer containing organophosphorus and organosilicon, was synthesized by the reaction of methylhydrosiloxane-dimethylsil...

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confidence: 99%

mentioning

confidence: 99%

Studies on the Thermal Properties and Flame Retardancy of Epoxy Resins Modified with Polysiloxane Containing Organophosphorus and Epoxide Groups

Hou

Liu

et al. 2007

Polym J

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“…The phosphorus-contained biphenyl phenolic resin (PBP) was prepared by a twostep procedure (Scheme 1), in which the DOPO-disubstituted 4,4'-biphenyldimethanol (BDCA-2DOPO) was first synthesized by the addition reaction of the -P(O)-H group in DOPO molecule with the -C(O)-H group in 4,4'-biphenyldicarboxylalhydride (BDCA) using DMAC as solvent at elevated temperature (120 o C) [21][22][23]. The dehydration polycondensation of BDCA-2DOPO with phenol catalyzed by p-toluenesulfonic acid using NMP as solvent at 120 o C yield the DOPOsubstituted phenolic resin (PBP).…”

Section: Synthesis Of Bdca-2dopo and Pbpmentioning

confidence: 99%

Preparation and characterization of flame retardant epoxy resins based on phosphorus-containing biphenyl-type phenolic resin

et al. 2010

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Abstract:A phosphorus-containing biphenyl-type phenolic resin (PBP) was prepared by dehydration polycondensation of the DOPO-disubstituted 4,4'-biphenyldimethanol compound (BDCA-2DOPO) with phenol in the presence of strong Lewis acid , in which BDCA-2DOPO was prepared by the reaction of DOPO with 4,4'-biphenyldicarboxaldehyde. The PBP resin has been evaluated as the curing agent of o-cresol epoxy resins. Experimental results indicated that the PBPcured epoxy resins exhibited good thermal stability, high char yields at 700 o C and outstanding flame retardant properties. UL 94 V-0 classifications could be obtained when the phosphorus loading in the epoxy resin is higher than 1.8 wt%.

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“…DOPO and its derivatives due to the molecular structure containing biphenyl ring and phenanthrene ring structure. Thermal stability and chemical stability are high than general organic phosphates [6][7][8].…”

Section: Introductionmentioning

confidence: 98%

Study on Flame Retardancy of Polylactic Acid Composites

Wang¹,

Zhou²,

Feng³

et al. 2017

dtetr

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Based on poly lactic acid (PLA) as the main body, we have selected the phosphorus flame retardant and montmorillonite as auxiliary materials. Prepared PLA composites by Huck torque rheometer, through limiting oxygen index determination, MCC test, UL-94 flame test, we have known the effect of flameretardant material and discussed its flame retardant mechanism. In addition, through measuring tensile strength, impact strength, flexural strength and elongation at break of poly lactic acid composite, we discuss the change of mechanical properties after adding flame retardants. Combustion performance tests show, phosphorus flame retardant and montmorillonite retardant system for poly lactic acid efficiency is very high. Adding a small amount of flame retardants can greatly improve the limiting oxygen index value, the vertical burning poly lactic acid level increased from NR level becomes V-0 level. Mechanics test research shows that a small amount of montmorillonite on composite materials tensile strength, impact strength and static bending strength has obvious promotion effect.

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Flame-retardant epoxy resins from novel phosphorus-containing novolac

Cited by 277 publications

References 33 publications

Studies on the Thermal Properties and Flame Retardancy of Epoxy Resins Modified with Polysiloxane Containing Organophosphorus and Epoxide Groups

Studies on the Thermal Properties and Flame Retardancy of Epoxy Resins Modified with Polysiloxane Containing Organophosphorus and Epoxide Groups

Preparation and characterization of flame retardant epoxy resins based on phosphorus-containing biphenyl-type phenolic resin

Study on Flame Retardancy of Polylactic Acid Composites

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