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采用DTA、偏光显微镜、X-射线衍射仪等对降冰片烯二甲酸酐(NA酐)的相态和相变进行了分析,发现并证实了NA酐在92℃时由针状晶体转变成树枝状晶体,主要在2θ=16.86°时产生一个极强的衍射峰。NA酐的晶形转变焓、熵分别为16.7 kJ/mol、45.8 J/k·mol;用双变量线性逼近的方法得到的转变动力学参数为:表观级数1.01,表观活化能341 kJ/mol,频率因子4.38×10~(48)s~(-1)。
The phase and phase transition of norbornenedicarboxylic anhydride (NA anhydride) were analyzed by DTA, polarized light microscopy and X-ray diffraction. It was found that NA anhydride changed from acicular crystals to branches at 92 ℃ Crystal, mainly in the 2θ = 16.86 ° produce a very strong diffraction peak. The enthalpies and entropies of crystal transition of NA anhydride were 16.7 kJ / mol and 45.8 J / k · mol, respectively. The transformation kinetic parameters obtained by the bivariate linear approximation method were as follows: apparent order 1.01, apparent activation energy 341 kJ / mol, the frequency factor is 4.38 × 10 ~ (48) s ~ (-1).