Details

Autor(en) / Beteiligte

• Liu, Yuhong
• Zhang, Xiying
• Gao, Ning

Titel

Synthesis and characterization of isocyanate-functionalized hyperbranched polyurethane and its cocuring with benzoxazine

Ist Teil von

• Polymer engineering and science, 2015-03, Vol.55 (3), p.604-613

Ort / Verlag

Newtown: Blackwell Publishing Ltd

Erscheinungsjahr

2015

Link zum Volltext

Quelle

Wiley Online Library

Beschreibungen/Notizen

• In the study, isocyanate‐functionalized hyperbranched polyurethane (HPUNCO) with a degree of branch of 35.2% was synthesized via an A2 + B3 method. This novel HPUNCO was used to fabricate a blend system with hydroxyl groups bearing benzoxazine precursor (BZOH) to investigate its effective on the thermal properties of BZOH. The structure of HPUNCO is confirmed by Fourier transform infrared (FTIR) and nuclear magnetic resonance spectroscopy. The curing behavior of the reactive HPUNCO/BZOH blend is investigated via differential scanning calorimetry and FTIR analyses. HPUNCO/BZOH blend indicates two successively broad exotherm peaks centered at 132 and 204°C, respectively, which is obviously different from that of BZOH with one broad peak centered at 206°C. Thermogravimetric analysis results confirmed that the thermal stability was enhanced and the char yield of BZOH was increased from 34.3 to 43.2% by cocuring with 10 wt% HPUNCO. POLYM. ENG. SCI., 55:604–613, 2015. © 2014 Society of Plastics Engineers