Cyansäureester sterisch gehinderter Phenole

Stroh, Rudolf; Gerber, H.

doi:10.1002/ange.19600722416

Cited by 9 publications

(4 citation statements)

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“…Although it has been almost 60 years since aryl cyanates were successfully synthesized from sterically hindered phenols, there is still a plenty to learn about their polymerization. For example, the structure of intermediates formed during polymerization remains debatable.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Mechanistic Insights into Thermally Initiated Polymerization of Cyanate Esters with Different Bridging Groups

Galukhin

Liavitskaya

Vyazovkin

2019

Macro Chemistry & Physics

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This study investigates the kinetics of thermally initiated polymerization of aryl cyanates with different bridging fragments ((CH3)2C, S, and O). To minimize the effect of impurities on the kinetics, the aryl cyanates are synthesized in a highly pure form. The rates of polymerization are measured by differential scanning calorimetry (DSC) and treated by an advanced isoconversional method. The DSC measurements indicate that the ((CH3)2C‐ and S‐bridging monomers have, respectively, the lowest and highest reactivities. The observed variation of the activation energy with conversion and temperature is determined to be in agreement with the two‐step kinetic model by Kamal. Estimating the parameters of the Kamal model has provided mechanistic insights into the polymerization process. The enhanced reactivity of the S‐bridged monomer is found to be associated with acceleration of the first step that demonstrates an increased value of the preexponential factor. The acceleration is linked to higher polarizability of this monomer that can promote stronger intermolecular interaction and preferred orientation of the reacting species.

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Section: Introductionmentioning

confidence: 99%

Kinetic and Mechanistic Insights into Thermally Initiated Polymerization of Cyanate Esters with Different Bridging Groups

Galukhin

Liavitskaya

Vyazovkin

2019

Macro Chemistry & Physics

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“…ArO-C. ^c-OAr Ν In 1960, however, a few sterically hindered cyanates were produced by essen tially the same process [8]. All these procedures involved the addition of cyanogen halides to a reaction medium in which an excess of alcoholates or phenolates was present.…”

Section: ν Na Nhmentioning

confidence: 99%

Cyanates, Isocyanates, Thiocyanates, and Isothiocyanates

Sandler¹

1983

Organic Functional Group Preparations

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“…[1] In 1963, Farbenfabriken Bayer AG patented a method that was successful with mono-and polyphenols and with a number of partially halogenated aliphatic hydroxyl compounds. [1] In 1963, Farbenfabriken Bayer AG patented a method that was successful with mono-and polyphenols and with a number of partially halogenated aliphatic hydroxyl compounds.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Novel Cyanate Ester Containing Dimethyl Benzene Linkage

Wang

Zhu

et al. 2010

International Journal of Polymer Analysis and Characterization

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A novel cyanate ester, dimethyl benzene cyanate ester (DMBCY), containing dimethyl benzene linkage, was synthesized from dimethyl benzene, methyl alcohol, formalin, and ClCN by a low-cost procedure. The resin was characterized by Fourier transform-infrared spectroscopy (FT-IR) and mass spectra (MS). The resin was cured with catalysts and studied by DSC. The thermal properties of the cured DMBCY were studied using DMA and TGA, and moisture absorption property was determined for the cured resin as well as its dielectric properties, flexural strength, and flexural modulus. The cured resin exhibited low dielectric constant (2.85), dissipation factor (2 Â 10 À4 ), and moisture absorption (0.43% after 48 h in 100 C).

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Cyansäureester sterisch gehinderter Phenole

Cited by 9 publications

References 0 publications

Kinetic and Mechanistic Insights into Thermally Initiated Polymerization of Cyanate Esters with Different Bridging Groups

Kinetic and Mechanistic Insights into Thermally Initiated Polymerization of Cyanate Esters with Different Bridging Groups

Cyanates, Isocyanates, Thiocyanates, and Isothiocyanates

Synthesis and Characterization of a Novel Cyanate Ester Containing Dimethyl Benzene Linkage

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