Liquid crystalline epoxy resin modified cyanate ester/epoxy resin systems

Yu, Yingfeng; Gan, Wenjun; Liu, Xiaoyun; Li, Shanjun

doi:10.1002/app.28358

Cited by 11 publications

(8 citation statements)

References 25 publications

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“…In addition, oxazolidinone absorption peak located at 1,750 cm −1 ( ν CO) disappeared due to the cure reaction of aromatic dicyanate. Also, the reduction in absorbance of triazine peak located at 1,370 and 1,560 cm −1 ( ν NCN) showed that the cyanate group decreased with epoxy content in the blend film .…”

Section: Resultsmentioning

confidence: 98%

Influence of epoxy addition on the thermal, mechanical, and dielectrical properties of polycyanurate films

Deniz

Sarıboğa

Yıldırım

et al. 2017

Polymer Engineering & Sci

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In the study, polycyanurate (PCN)/epoxy resin (ER) blends are prepared to enhance the physical properties of cyanate ester resins. The effects of curing schedule and blend composition on their thermal, mechanical, and dielectrical properties of cured PCN/epoxy blend films are examined. FTIR analysis of the cured blend films exhibits the expected cyanurate and oxazolidinone peaks in all blend compositions except the film thermally treated for 1 h in the presence of 1% phenol. TGA results show that the thermal stability decreases with epoxy content in the blend film. From SEM analyses, it is observed that all films have very dense, smooth, and bubble free surface without phase separation. For the pure PCN, the dielectric constants are found to be 3.54-5.91 in the range of 10 21 -10 7 Hz between 208C and 2008C. PCN/epoxy blends up to 50% epoxy resin show a good stability of dielectric constant in this frequency band for 2008C, which is close to the dielectric constant of the homopolymerized PCN. Beyond this percentage of epoxy resin, dielectric constants of PCN/epoxy blends greatly increase at low-frequency region (0.1-10 3 Hz) due to the interfacial polarization governed by Maxwell-Wagner-Sillars effect. POLYM. ENG. SCI., 58:820-829, 2018.Isocyanurate 1,695 (m C@O) 1,490 (amide N)Ring opening polymerization of EP 1,179 (m CAOAC of polyether)

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Section: Resultsmentioning

confidence: 98%

Influence of epoxy addition on the thermal, mechanical, and dielectrical properties of polycyanurate films

Deniz

Sarıboğa

Yıldırım

et al. 2017

Polymer Engineering & Sci

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“…Liquid crystalline polymers are chemical modifiers which simultaneously enhance thermal and mechanical properties, unlike thermoplastics and rubber modifiers. These are thermosets with elastomeric behavior. , Yu et al utilized liquid crystalline EP (LCE) to modify the thermal properties of the CE–EP blend. The results showed that the addition of LCE from 0 to 20 wt % lowers the CTE below T g from 53.6 to 42 μm/mK.…”

Section: Thermal Propertiesmentioning

confidence: 99%

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Salunke

Sasidharan

Gopinathapanicker

et al. 2021

Ind. Eng. Chem. Res.

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The blending of conventionally available polymers has been extensively investigated over the past several decades and is considered as an alternative cost-effective method for the development of new polymers for specific applications. The blending of thermosets invites special attention as many of them can be used as matrices for composites for primary load-bearing applications. Cyanate ester and epoxy are two of the most popular thermoset polymers used across various industries such as aerospace, automobile, military, and civil sectors. Nevertheless, each of these resins has its limitations when used individually. Hence the blending of cyanate ester and epoxy is significant, for both commercial and academic interests. In this article, investigations on blends of cyanate ester and epoxy are reviewed based on their properties. Emphasis has been made on modifications of such blends resulting in improvements in mechanical, thermal, and other functional properties. Various applications employing these thermoset blends are discussed subsequently.

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“…Liquid‐crystalline epoxy resins (LCERs) are important thermosetting polymeric materials. Under suitable curing conditions, the curing reaction of LCERs with a curing agent can form highly ordered and densely crosslinked liquid‐crystalline polymer networks, which show interesting properties because of the combination of thermoset and liquid‐crystalline formation capabilities 1–4. The cure kinetics and reaction mechanism of epoxy resins and LCERs are widely studied by isothermal or dynamic experiments with differential scanning calorimetry (DSC).…”

Section: Introductionmentioning

confidence: 99%

Nonisothermal cure kinetics and diffusion effect of liquid‐crystalline epoxy sulfonyl bis(1,4‐phenylene)bis[4‐(2,3‐epoxypropyloxy)benzoate] resin with aromatic diamine

Gao

Huo

2012

J of Applied Polymer Sci

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The curing kinetics of the liquid-crystalline epoxy resin sulfonyl bis(1,4-phenylene)bis[4-(2,3-epoxypropyloxy)benzoate] with 4,4 0 -diaminodiphenylsulfone was investigated by nonisothermal differential scanning calorimetry. The relationship between the apparent activation energy (E a ) and the conversion was determined, and the effects of the molecular structure and the order of liquid crystallinity on E a are discussed in detail. Some parameters were evaluated with the autocatalytic kinetic model of the Šesták-Berggren (S-B) equation. The results show that there were some deviations of these simulation curves from the experimental curves at high heating rates and in the late stage of the curing reaction. The diffusion effect in the nonisothermal curing reaction is discussed, and a dif-fusion factor was proposed and introduced into the S-B equation. Then, a modified S-B equation was created, as follows: da, where a is the conversion, t is the time, m and n are reaction orders, K is rate constant, C is the diffusion coefficient, and a c is the critical conversion. The theoretical simulation curves agreed very well with the experimental data as determined with the modified S-B equation, which may be more useful for describing and predicting the nonisothermal curing reaction kinetics of epoxy resin.

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Liquid crystalline epoxy resin modified cyanate ester/epoxy resin systems

Cited by 11 publications

References 25 publications

Influence of epoxy addition on the thermal, mechanical, and dielectrical properties of polycyanurate films

Influence of epoxy addition on the thermal, mechanical, and dielectrical properties of polycyanurate films

Cyanate Ester—Epoxy Blends for Structural and Functional Composites

Nonisothermal cure kinetics and diffusion effect of liquid‐crystalline epoxy sulfonyl bis(1,4‐phenylene)bis[4‐(2,3‐epoxypropyloxy)benzoate] resin with aromatic diamine

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