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Study on the Sythesis and Properties of Fluorene-containing Benzoxazines

Author: HuoZiChun
Tutor: LiuWenBin
School: Harbin Engineering University
Course: Applied Chemistry
Keywords: flourene-containing benzoxazines synthesis curing process thermal stability
CLC: TQ323.1
Type: Master's thesis
Year: 2009
Downloads: 67
Quote: 3
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Abstract


As a new type of phenolic resin, polybenzoxazine have attracted much attention owing to its outstanding characteristics such as near-zero shrinkage or volumetric expansion upon curing, good thermal properties, electrionic properties, and flame retardant.By taking advantage of the molecular design flexibility of benzoxazine, three novel bisphenol-based benzoxazines, BPBF, BPMBF and BBBF, and two diamine-based benzoxazines, BAFB and MBAFB were parpared. And synthetic conditions such as reagent formula, reaction temperature and reaction time were optimized. The chemical structures of the obtained products were characterized by FTIR and NMR. Under optimized process, the average weight yield of BPBF and BAFB was 92.3% and 69.2% respectively.The curing processes of the resulting five benzoxazines were investigated by differential scanning calorimetry (DSC) to obtain initial peak and final extrapolated curing temperatures, and the optimized curing processes were finally concluded based on the results of the abovementioned testment. DSC results indicate that the order of the five curing processes were all one. And the curing activation energies of the diamine-based benzoxazines were lower than the bisphenol-based benzoxazine. The curing activation energy increased with increase of the substituent group’volume owing to the steric hinderance effect.The influences of heating-up rate, curing temperature and molecular constitution on themal stability of polybenzoxazines were evaluated. The results indicate that the char yield increases with the adding of heating rate and the content of phenyl group increasing. Increasing the curing temperature resulted in lower char yield. The thermal properties of two polybenzoxazines were evaluated by thermogravimetric analysis (TGA). The orders and energies of the two decomposition reactions were determined. TGA results indicate that the orders of the two decomposition reactions were all one, and the thermal stability of the diamine-based polybenzoxazine was better than the bisphenol-based polybenzoxazine.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Phenolic resins and plastic materials
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