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【答案】应助回帖
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爱与雨下: 金币+1 2012-09-20 21:39:58
sltmac: 金币+15, 翻译EPI+1 2012-11-01 10:31:42
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Through the TG curve ( Fig. 4) was found in either the BOZ-1 high purity products or their untreated crude product decomposition rates were higher than those of BOZ-3, and 800℃the residual carbon rate is far lower than that of BOZ-3, BOZ-1 heat resistance than BOZ-3, this explained to a certain extent the benzoxazine resin prepolymer. Xi Bingji and methoxy not only produces a synergistic effect to increase the curing product heat resistance, but will reduce its thermal performance. At the same time, the author found that crude product initial decomposition temperature while the higher purity product is low, but its heat resistance is high purity products, from Figure 4, it is not difficult to find whether BOZ-1 or BOZ-3 crude product decomposition rate is lower than 800℃high purity products, the residual carbon rate is more than the product of high purity. This is because the crude product containing benzoxazine compound monomer oligomers, oligomers containing hydroxyl group, and the hydroxyl presence can accelerate benzoxazine resin prepolymer curable, make originally below the decomposition rate cure rate increased and eventually to curing, decomposition supplemented, curing extent increase can be effective increase the cured product of cross-linking density, increasing carbon layer structure and protection layer, improve the curing thermostability, and ultimately reflected in high carbon residue rate and low decomposition rate, BOZ-1 ' and BOZ-3 ' phased weightlessness effectively confirmed the hypothesized. |
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