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Synthesis and characterization of phenylsiloxane‐modified bismaleimide/barbituric acid‐based polymers with 3‐aminopropyltriethoxysilane as the coupling agent
Author(s) -
Pham QuocThai,
Hsu JungMu,
Pan JingPin,
Wang TsungHsiung,
Chern ChorngShyan
Publication year - 2013
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.4390
Subject(s) - oligomer , differential scanning calorimetry , thermogravimetric analysis , thermal stability , polymer chemistry , materials science , polymer , curing (chemistry) , fourier transform infrared spectroscopy , chemistry , chemical engineering , organic chemistry , composite material , physics , engineering , thermodynamics
The preparation and characterization of phenylsiloxane ( PhSLX )‐modified N , N ′‐bismaleimide‐4,4′‐diphenylmethane ( BMI )/barbituric acid ( BTA ) (10/1 mol/mol) oligomers are described. 3‐Aminopropyltriethoxysilane ( APTES ) was used as the coupling agent. The resultant hybrid BMI / BTA‐APTES‐PhSLX polymers were characterized primarily using thermogravimetric analysis in combination with differential scanning calorimetry and Fourier transform infrared measurements. The thermal stability of the BMI / BTA oligomer was improved significantly by incorporation of a small amount (20–30 wt%) of the copolymer of PhSLX and APTES ( PASi ). After adequate post‐curing reactions, the PASi ‐modified BMI / BTA oligomers ( HYBRID20 and HYBRID30 containing 20 and 30 wt% PASi , respectively) exhibited greatly reduced thermal degradation rates in the temperature range 300–800 °C and an increased level of residues at 800 °C as compared to the native BMI / BTA oligomer. This was further confirmed by thermal degradation kinetic studies, in which the activation energies for the thermal degradation reactions of the cured PASi ‐modified BMI / BTA oligomers were shown to be higher than that of the pristine BMI / BTA oligomer. © 2012 Society of Chemical Industry