Curing behaviors of cyanate ester/epoxy copolymers and their dielectric properties

Lei, Yangxue; Xu, Mingzhen; Jiang, Mingli; Huang, Yumin; Liu, Xiaobo

doi:10.1177/0954008316672291

Cited by 30 publications

(27 citation statements)

References 29 publications

(47 reference statements)

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“…The stronger the polarity of the polymers, the higher the dielectric constant and the dielectric loss formed. 35,36 In the current study, nonpolar phthalocyanine ring and triazine ring would form in our forming conditions which can contribute to the stable dielectric properties. For various introduction methods of CPEN, the nitrile groups in CPEN would further copolymerize with the phthalonitrile-based matrix and contribute to the stabile dielectric constant.…”

Section: Dielectric Properties Of the Various Laminatesmentioning

confidence: 75%

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

Ren

Lei

Pan

et al. 2017

J of Applied Polymer Sci

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Phthalonitrile containing benzoxazine (BA‐ph) and cyanate ester (CE) were chosen as the thermosetting matrix and the glass fiber (GF) reinforced laminates formed at low temperature were designed. The polyarylene ether nitriles containing pendent carboxyl groups (CPEN) was selected to modify the interfacial interaction between the resin matrix and GFs. Two methods of introducing CPEN were compared and the effects of CPEN on curing behaviors and properties of the composites were investigated. Results showed that with the CPEN, exothermic peaks shifted to lower temperature and curing temperatures of BA‐ph/CE decreased slightly. The mechanical and thermal properties of GF‐reinforced composites were discussed and the results indicated that the composites of modified GFs with CPEN exhibited outstanding mechanical properties, higher glass transition temperature (Tg > 290 °C) than that of composites composed of CPEN mixed with BA‐ph/CE. Moreover, GF‐reinforced composites showed stable dielectric constants (3.8–4.5) and low dielectric loss (0.005–0.01), which were independent of the frequency. In sum, the various methods of the introduction of CPEN in the GF‐reinforced composites may provide a new route to prepare improved composites, meanwhile, composites with outstanding processability and excellent mechanical and thermal properties are expected to be widely applied in the fields of high‐performance structural materials. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45881.

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Section: Dielectric Properties Of the Various Laminatesmentioning

confidence: 75%

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

Ren

Lei

Pan

et al. 2017

J of Applied Polymer Sci

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“…The peak temperature of the second decomposition (T max2 ) of 0.2 PreEP/CE is consistent with that (first decomposition peak) of CE and EP/CE, namely the triazine ring decomposition peak. [42,43] The third one (T max3 ) is close to the second decomposition peak of CE which is located between 480 and 580 C, namely the decomposition of carbonaceous charcoal containing residual oxygen and nitrogen. [43] 4 | CONCLUSIONS This study uses a new method to improve the toughness properties of polycyanates ester.…”

Section: Phase Morphologies Of Preep/cementioning

confidence: 88%

“…However, how PreEP with an uncured epoxy group reacts with CE still warrants discussion. As shown in Figure 2 (Table S1), the CE and EP/CE systems have only one curing exothermic peak in the reaction process, [15,42] while the PreEP/CE system has two peaks. Both exothermic peaks of PreEP/CE move to low temperatures when the PEA content increases.…”

Section: Curing Mechanism Of Preep/cementioning

confidence: 99%

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Improving the toughness of polycyanate ester by adding epoxy pre‐polymer with different molecular weights

Huang

et al. 2020

J of Applied Polymer Sci

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The toughness of polycyanate ester is improved by adding epoxy pre‐polymer with varying molecular weights. The curing mechanism of epoxy prepolymer (PreEP) and cyanate ester (CE) is discussed based on differential scanning calorimeters and Fourier‐transform infrared spectroscopy. The mechanical, phase separated structures and thermal properties of PreEP/CE are also evaluated. It is found that the molecular weight of PreEP can reach 1,800 when it is cured at 90°C for 45 min by using a set amount of polyetheramine. Meanwhile, by increasing the molecular weight of the prepolymer, the mechanical properties of PreEP/CE show increased first, and then decreased. 0.2 PreEP/CE has the highest bending strength and impact strength (105.8 MPa and 18.3 kJ·m−2). There are 26.7 and 114.5% higher than those of polycyanate ester, respectively. The tougher PreEP/CE is attributable to the phase‐separated structures and the decrease in the cross‐linked product (Oxazolidinone) in PreEP and CE. The method showed in this article provides a new way to improve the toughness properties of thermoset resin.

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“…Polycyanurates are thermosetting networks with outstanding properties, including good thermal resistance, high tensile moduli (up to 3 GPa), high glass transition temperatures (>250 °C), and good dielectric properties . They are used as composites in aerospace, electronics, and construction applications .…”

Section: Introductionmentioning

confidence: 99%

Kinetic Study of Curing Bisphenol A Dicyanate Ester with Ionic Liquid Additive

Zhai

Quitevis

Simon

2019

J Polym Sci B Polym Phys

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A kinetic study of the trimerization reaction of bisphenol A dicyanate ester with an aromatic imidazolium-based ionic liquid (IL) as additive is performed using dynamic and isothermal differential scanning calorimetry. The reaction follows second-order autocatalytic kinetics, and a slight acceleration effect is observed in the presence of the aromatic IL relative to the neat resin. The activation energy also increases with the IL additive, whereas the glass transition temperature (T g ) is depressed, consistent with the Fox equation and a homogeneous one-phase material. A model incorporating diffusion effects is able to describe the dynamic and isothermal curing data for both the neat resin system and that containing aromatic IL. A comparison with aliphatic-based IL additive indicates that the reaction is more accelerated with aliphatic IL than with the aromatic IL in spite of the fact that the aliphatic additive phase separates during cure.

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Curing behaviors of cyanate ester/epoxy copolymers and their dielectric properties

Cited by 30 publications

References 29 publications

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

Design of the phthalonitrile‐based composite laminates by improving the interfacial compatibility and their enhanced properties

Improving the toughness of polycyanate ester by adding epoxy pre‐polymer with different molecular weights

Kinetic Study of Curing Bisphenol A Dicyanate Ester with Ionic Liquid Additive

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