Two-Dimensional Raman Correlation Spectroscopy Study of the Pathway for the Thermal Imidization of Poly(amic acid)
Two-Dimensional Raman Correlation Spectroscopy Study of the Pathway for the Thermal Imidization of Poly(amic acid)
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DOI：
10.5012/bkcs.2003.24.3.357
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发表时间：
2003
影响因子：
1.7
通讯作者：
K. Yu;Yang Hyun Yoo;J. Rhee;Myong-Hoon Lee;Soo-chang Yu
中科院分区：
文献类型：
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作者：
K. Yu;Yang Hyun Yoo;J. Rhee;Myong-Hoon Lee;Soo-chang Yu
采用二维拉曼相关光谱技术对聚酰胺酸（PAA）热亚胺化过程中酰亚胺闭环的途径进行了研究。同步光谱中交叉峰的符号提供了PAA随加热温度升高而热亚胺化成PI的证据。异步光谱中交叉峰的符号表明，酰亚胺相关的模式先于酰胺或羧基模式发生变化，这表明环化发生在酰胺质子被夺取之前。
The pathway producing imide ring closure during the thermal imidization of poly(amic acid) (PAA) was investigated in detail using a new analytical method, two-dimensional (2D) Raman correlation spectroscopy. The signs of the cross peaks in synchronous spectra provided evidence of the thermal imidization of PAA into PI as the heating temperature increased. The signs of the cross peaks in asynchronous spectra suggested that the imide-related modes changed prior to the amide or carboxylic mode, which indicates that cyclization occurred before the amide proton was abstracted.