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zhzh0731金蟲 (小有名氣)
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[求助]
高分子熱重測試分析
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| 聚合物PDMAEMA、PVA和PDMAEMA/PVA復(fù)合薄膜的熱重分析圖見Fig.S2 Supplementary data。由Fig.S2可以得知,PVA在氮?dú)夥諊碌闹饕纸怆A段是170℃-350℃,這個階段將分解高活化能的結(jié)構(gòu)單元,高溫區(qū)350℃-600℃區(qū)域?qū)堄嗟木酆衔锝Y(jié)構(gòu)單元進(jìn)行深度分解[12]。復(fù)合膜PDMAEMA/PVA與PVA熱分解差異較大,其熱穩(wěn)定性卻與PDMAEMA類似,且隨PDMAEMA含量的減少熱穩(wěn)定性明顯增加,通過DTA圖看出其分解速度和分解量也隨PDMAEMA含量減少明顯下降,在400℃左右清晰的看出PVA的引入使膜分解速度下降,因此PVA參雜到PDMAEMA中有效的改善了聚合膜的熱穩(wěn)定性能。 |
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翻譯得不好,還請見諒! 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. |
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