Crosslinking behavior of polyarylene ether nitrile terminated with phthalonitrile (PEN‐<i>t</i>‐Ph)/1,3,5‐Tri‐(3,4‐dicyanophenoxy) benzene (TPh) system and its enhanced thermal stability

Tong, Lifen; Pu, Zejun; Huang, Xu; Chen, Zhiran; Yang, Xulin; Liu, Xiaobo

doi:10.1002/app.39312

Cited by 34 publications

(33 citation statements)

References 25 publications

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“…The polyarylene ether nitrile terminated with phthalonitrile (PEN-Ph) is firstly synthesized in our laboratory according to our previous work35. Through simply curing with high temperature, the phthalonitriles capped at the ends of PEN self-crosslink and form the phthalocyanines as the crosslinking points in the system3637. As the crosslinking points are at the ends of linear PEN, the obtained network is a PEN elastomer.…”

Section: Resultsmentioning

confidence: 99%

Crosslinked polyarylene ether nitrile film as flexible dielectric materials with ultrahigh thermal stability

Yang

Wei

et al. 2016

Sci Rep

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Dielectric film with ultrahigh thermal stability based on crosslinked polyarylene ether nitrile is prepared and characterized. The film is obtained by solution-casting of polyarylene ether nitrile terminated phthalonitrile (PEN-Ph) combined with post self-crosslinking at high temperature. The film shows a 5% decomposition temperature over 520 °C and a glass transition temperature (Tg) around 386 °C. Stable dielectric constant and low dielectric loss are observed for this film in the frequency range of 100–200 kHz and in the temperature range of 25–300 °C. The temperature coefficient of dielectric constant is less than 0.001 °C−1 even at 400 °C. By cycling heating and cooling up to ten times or heating at 300 °C for 12 h, the film shows good reversibility and robustness of the dielectric properties. This crosslinked PEN film will be a potential candidate as high performance film capacitor electronic devices materials used at high temperature.

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Section: Resultsmentioning

confidence: 99%

Crosslinked polyarylene ether nitrile film as flexible dielectric materials with ultrahigh thermal stability

Yang

Wei

et al. 2016

Sci Rep

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“…It is well known that phthalonitrile shows excellent reactivity and crosslinkable property [19,20]. Therefore, by introducing the phthalonitrile in the end of the PEN main chain, the PEN-Ph integrated the excellent performances of PEN [21][22][23][24][25] (high thermal stability, superior mechanical properties as well as good workability) and the crosslinkable property of the phthalonitrile, resulting in more excellent thermal properties and mechanical properties [26,27]. Besides, the PEN-Ph also possesses partially crystalline owing to the regular structure of the part of the molecular chain.…”

Section: Introductionmentioning

confidence: 99%

A novel single-component composite based on phthalonitrile end-capped polyarylene ether nitrile: crystallization and crosslinking

2015

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A novel single-component composite based on phthalonitrile end-capped polyarylene ether nitrile (PEN-Ph) was prepared successfully via hot compression. In the PENPh system, the crosslinking reactions and crystallization exist simultaneously, and the crystals are embedded in the crosslinked PEN-Ph matrix, which can work as reinforcement. Analysis of the Non-isothermal cold crystallization kinetics of the PEN-Ph system was performed by using differential scanning calorimetry (DSC), and the activation energy of the crystallization process is obtained to be 217.5 kJ·mol −1 . The DSC and SEM analysis provide the evidence for that there exists crosslinking reactions as well as crystallization behavior. However, the crosslinking reaction with excessive speed will restrict the crystallization behavior of the PEN-Ph. Furthermore, the DMA and mechanical measurements indicate that the glass transition temperature and mechanical properties are influenced by not only the crosslinking degree but also the crystallinity. The tensile strength of the single-component composite is 111.0 MPa, increased by about 10 MPa than that of amorphous PEN-Ph sheet.

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“…Compared with the phthalonitrile resins reported, stronger endothermic peaks below 300 °C were observed after blending the resins with the mixed curing agent, as seen in Figure , suggesting obvious curing reactions were occurring as a result of the enhanced moveability of the chain segments. The curing peak temperature was reduced after BP‐Ph was added, implying higher curing reactivity was obtained.…”

Section: Resultsmentioning

confidence: 86%

Low‐viscosity and soluble phthalonitrile resin with improved thermostability for organic wave‐transparent composites

Han

et al. 2017

J of Applied Polymer Sci

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High processing viscosity and poor solubility limit the application of heterocyclic polymers for fabricating organic wavetransparent composites for aerospace applications. In this paper, a novel resin, poly(phthalazinone ether bisphenol fluorene) encapped with phthalonitrile (PPEBF-Ph), was synthesized and used as the matrix. Biphenol-based phthalonitrile monomer BP-Ph was also synthesized and blended with PPEBF-Ph to further lower the processing viscosity. Solubility tests showed that the resin was soluble in dimethylformamide, N,N-dimethyl acetamide, N-methylpyrrolidone, dimethyl sulfoxide, chloroform, and other solvents. Differential scanning calorimetry and rheological studies revealed that the mixed resins exhibited low processing viscosity and a wide processing window below the gel temperature. Thermogravimetric analysis indicated that the cured resins were stable below 510-530 8C under nitrogen atmosphere after 6 h of curing (decreased by 40-60% compared with previous reports on phthalonitrile resin). In air, the char yields of the resins reached 20-30% when heated at 800 8C. The composites were reinforced by a quartz fiber cloth and exhibited a dielectric constant of 2.94-3.27 in an electromagnetic field with frequency ranging from 8 to 18 GHz. Retention of the bending modulus exceeded 70% at 400 8C according to dynamic mechanical analysis, indicating excellent mechanical stability was obtained.

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Crosslinking behavior of polyarylene ether nitrile terminated with phthalonitrile (PEN‐t‐Ph)/1,3,5‐Tri‐(3,4‐dicyanophenoxy) benzene (TPh) system and its enhanced thermal stability

Cited by 34 publications

References 25 publications

Crosslinked polyarylene ether nitrile film as flexible dielectric materials with ultrahigh thermal stability

Crosslinked polyarylene ether nitrile film as flexible dielectric materials with ultrahigh thermal stability

A novel single-component composite based on phthalonitrile end-capped polyarylene ether nitrile: crystallization and crosslinking

Low‐viscosity and soluble phthalonitrile resin with improved thermostability for organic wave‐transparent composites

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