Curing behavior and network formation of cyanate ester resin/polyethylene glycol

Ma, Junxian; Lei, Xuefeng; Tian, Dean; Yuan, Liangjie; Liao, Chongshan

doi:10.1002/app.41841

Cited by 11 publications

(12 citation statements)

References 27 publications

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“…This is consistent with the DSC analysis described above. Based on previous studies, 16,30 the curing process of BADCy with different POs includes the following reactions (Figure 3): (1) cyclotrimerization of BADCy and further cyclotrimerization network formation, (2) formation of imidocarbonate by the reaction between −OCN functional group and −OH group from POs, (3) copolymerization between imidocarbonate and −OCN groups in BADCy monomers and (4) formation of polycyanurate via decomposition of imidocarbonate.…”

Section: Resultsmentioning

confidence: 99%

“…This was because −OH and −OCN were polymerized to form –O–C (=NH) –O– groups, which extended the chain length between the triazine rings and reduced the triazine ring density in the cross-linked network. 16,34 Among the modification agents, HO made the greatest contribution to maintaining the heat resistance of the polycyanurates. The copolymer with 1 wt% HO showed the highest T g (296.4°C), which was higher than that of the modified polycyanurates reported previously ( T g of 224.8°C when containing 10 wt% modification agent).…”

Section: Resultsmentioning

confidence: 99%

“…Recently, various additives have been used to modify cyanate esters, including transition metal catalysts, 10 –13 photocatalysts 14,15 and active hydrogen catalysts, 8,16 with different effects on curing cyanate ester resins. Transition mental catalysts and active hydrogen catalysts have attracted particular attention.…”

Section: Introductionmentioning

confidence: 99%

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Effects of trace phenolic hydroxyl groups on the cure behaviours and properties of cyanate esters

Wang

Hou

Chen

et al. 2020

High Performance Polymers

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To improve the curing properties of cyanate esters and retain their heat resistance, dielectric properties and adhesion properties, modified cyanate copolymers were prepared by blending bisphenol A cyanate (BADCy) ester with phenol, hydroquinone (HO), resorcinol and phloroglucinol (LO). Differential scanning calorimetry analysis (DSC) and Fourier transform infrared spectroscopy were used to investigate the cure behaviours of the prepared compounds. The prepared materials were compared with the BADCy ester containing trace of cobalt acetylacetonate (CoAt). The CoAt/BADCy blend modified by HO exhibited better curing properties. The exothermic peak temperature ( T p) of the CoAt/BADCy blend dropped to 169°C after introducing 1 wt% HO, likely due to the hydroxyl functional groups at the para position of the benzene ring resulting in higher symmetry and reactivity for the HO. In addition, compared with original CoAt/BADCy, the cyanate esters modified by phenolic hydroxyl groups demonstrated higher adhesive properties and a similar glass transition temperature (approximately 290°C) as well as stable dielectric properties. The experimental results indicate potential applications of the cyanate ester under high-temperature conditions.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Effects of trace phenolic hydroxyl groups on the cure behaviours and properties of cyanate esters

Wang

Hou

Chen

et al. 2020

High Performance Polymers

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“…These phenomena presented that BPAF had short curing time for modifying cyanate ester resins. It could be because BPAF formed active catalytic species or imidocarbonates intermediately with —OCN, and the active energy of that reaction was lower than the reaction that formed triazine ring …”

Section: Resultsmentioning

confidence: 99%

“…At present, catalysts of CEs mainly include transition metal catalysts, photocatalysts and active hydrogen catalysts, and they have different effects on curing CEs. Researchers have paid significant efforts to cure CEs by using these catalysts.…”

Section: Introductionmentioning

confidence: 99%

Preparation and properties of 4,4′‐(hexafluoroisopropylidene) diphenol cured 2,2‐bis(4‐cyanatophenyl) propane

Hou

Liu

et al. 2016

J of Applied Polymer Sci

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A novel easily curing system of 2,2-bis(4-cyanatophenyl) propane(BACY) was prepared by employing 4,4 0 -(Hexafluoroisopropylidene) Diphenol (BPAF) as modifier. The curing efficiency of BPAF was evaluated by means of differential scanning calorimetry (DSC) and Fourier translation infrared spectroscopy analysis (FTIR). It was found that the exothermic peak temperature (T p ) was 168 8C when the content of BPAF/BACY was 15/85 by weight, while the temperature of BACY was 215 8C under the same conditions when trace of cobalt(III) acetylacetonate(CoAt(III)) was added. Besides, BPAF/BACY system owned outstanding properties including excellent curing characteristics, high shear strength, remarkable dielectric properties and high thermal stability in contrast to BACY, 4,4 0 -(1-methylethylidene) bisphenol(BPA)/BACY, and nonylphenol(NoP)/BACY systems. Moreover, the properties of cured BPAF/ BACY modified by different proportions of BPAF were studied in detail. It was shown that moderate BPAF was conducive to most properties of polycyanurate, and the optimal proportion of BPAF/BACY was 15/85 by weight. V C 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44518.

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Catalytic cyanate resin with polysulfide cation catalyst and its ultra‐high molecular weight polyethylene fiber composites for radome

Jiang,

Geng,

et al. 2024

Polymer Composites

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Cyanate (CE) resin and ultrahigh‐molecular‐weight polyethylene (UHMWPE) fiber are respectively important matrix and reinforcing material for lightweight and high wave‐transparent composites. However, the preparation and application of the composites is limited by the mismatch of molding temperature between CE resin and UHMWPE fiber. The best method to solve this problem is to catalyze the CE resin curing reaction and reduce its molding temperature from 270 to 135°C, which is the upper heat‐resistance temperature of UHMWPE fiber. In this study, the polysulfide catalyst (PSC) was used to catalyze CE resin curing reaction, reduce the curing reaction activation energy and the molding temperature. The apparent activation energy of the CE‐PSC resin decreases from 107.2 to 60.7 kJ mol−1, and the glass transition temperature of the CE‐PSC resin is 257.2°C, flexural strength and tensile strength are 120.2 and 60.8 MPa, respectively. As a result, the CE‐PSC/UHMWPE fiber composites, which are molded at the matching temperature of 135°C, have low density of 1.05 g cm−3, low dielectric constant of 2.4, low dielectric loss of 0.006, and high wave transmittance of 92.2%. Therefore, the CE‐PSC/UHMWPE fiber composites have wide application prospect in the field of light weight and high wave‐transparent composites.Highlights A novel catalytic CE resin can be cured at 135°C with low dielectric properties. The processing temperature mismatch between CE and UHMWPE fiber was solved. Catalytic CE/UHMWPE composites have lightweight and high wave‐transparent properties.

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Curing behavior and network formation of cyanate ester resin/polyethylene glycol

Cited by 11 publications

References 27 publications

Effects of trace phenolic hydroxyl groups on the cure behaviours and properties of cyanate esters

Effects of trace phenolic hydroxyl groups on the cure behaviours and properties of cyanate esters

Preparation and properties of 4,4′‐(hexafluoroisopropylidene) diphenol cured 2,2‐bis(4‐cyanatophenyl) propane

Catalytic cyanate resin with polysulfide cation catalyst and its ultra‐high molecular weight polyethylene fiber composites for radome

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