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zhzh0731金虫 (小有名气)
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[求助]
高分子热重测试分析
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| 聚合物PDMAEMA、PVA和PDMAEMA/PVA复合薄膜的热重分析图见Fig.S2 Supplementary data。由Fig.S2可以得知，PVA在氮气氛围下的主要分解阶段是170℃-350℃,这个阶段将分解高活化能的结构单元，高温区350℃-600℃区域对残余的聚合物结构单元进行深度分解[12]。复合膜PDMAEMA/PVA与PVA热分解差异较大，其热稳定性却与PDMAEMA类似，且随PDMAEMA含量的减少热稳定性明显增加，通过DTA图看出其分解速度和分解量也随PDMAEMA含量减少明显下降，在400℃左右清晰的看出PVA的引入使膜分解速度下降，因此PVA参杂到PDMAEMA中有效的改善了聚合膜的热稳定性能。 |
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【答案】应助回帖
★ ★
zhzh0731(金币+100, 翻译EPI+1): 挺好的，谢谢！ 2011-04-30 21:10:57
Mally89(金币+2): 鼓励新虫的热情应助！~ 2011-05-03 10:11:19
zhzh0731(金币+100, 翻译EPI+1): 挺好的，谢谢！ 2011-04-30 21:10:57
Mally89(金币+2): 鼓励新虫的热情应助！~ 2011-05-03 10:11:19
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翻译得不好，还请见谅！ Fig. S2 shows the TGA curves of PDMAEMA, PVA, and PDMAEMA/EVA films. As shown in Fig. S2, the main decomposition temperature of PVA is from 170℃ to 350℃ due to the decomposition of high activation energy unit. At high temperature from 350℃ to 600℃, the residual PVA is further decomposed [12]. The thermal property of PDMAEMA/PVA film is quite different with that of PVA, however, it is similar with PDMAEMA and increases with decreasing content of PDMAEMA. From the DTA curves, it is observed that both the decompostion rate and decomposition weight decrease with decreasing content of PDMAEMA. It is clear that the introduction of PVA causes the reduction of decomposition rate in the region of 400℃. Therefore, the addition of PVA improves the thermal stability of PDMAEMA/PVA films effectively. |
2楼2011-04-30 20:46:22
