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Preparation and characterization of biscyanamide resins containing o ‐substituted groups or phenyl–ether linkage
Author(s) -
Suzuki Masao,
Nagai Akira,
Suzuki Masahiro,
Takahashi Akio
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430209
Subject(s) - differential scanning calorimetry , curing (chemistry) , ether , substituent , thermal stability , polymer chemistry , materials science , alkyl , polymerization , chemistry , organic chemistry , polymer , composite material , physics , thermodynamics
New biscyanamides containing o ‐substituted groups or a phenyl‐ether linkage were synthesized. The curing reaction behaviors of the biscyanamides were investigated. All the prepared biscyanamides began to polymerize as soon as they melted after being put on a heated plate beyond a certain temperature. The cured resins of each biscyanamides were prepared on the optimal conditions. Optimal conditions for cured resins were obtained from the curing reaction behaviors of each biscyanamide by differential scanning calorimetry (DSC). The effect of chemical structures of the biscyanamides on the thermal and mechanical properties of the cured resins such as seen by thermal gravimetric analysis (TGA), density, and flexural strength were studied. The introduction of alkyl groups into the ortho position decreased intermolecular interactions. The introduction of a long phenyl‐ether linkage into the structure gave a broad exothermal peak in the DSC and good workability for the preparation of the cured resins. Moreover, the extension between cross‐linkings improved the flexibility of the cured resins. The cured resins with fluorine‐containing substituent groups also had better thermal stability in the air compared with hydrocarbon group resins.