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研究了吲哚啉环上的取代基及高分子介质对螺恶嗪 (ASP)的光致变色与热消色过程的影响 .当吲哚啉环 1位上的取代基R2 的空间位阻增大时 ,热消色速率减慢 .当吲哚啉环 5位上的取代基R1氢原子被供电子基团取代时 ,成色体的稳定性增加 ;而被吸电子基团取代时 ,成色体的稳定性降低 .螺恶嗪成色体的稳定性还与高分子介质的性质有关 .高分子介质的极性愈强 ,刚性愈大 ,成色体的热消色速率愈慢 .反之亦然 .成色体的热消色动力学符合双指数衰减规律
The effects of substituents on the indoline ring and the photochromism and thermal decoloration of spirooxazine (ASP) were studied.When the steric hindrance of the substituent R2 on the 1-position of the indoline ring increases The thermal decoloration rate is slowed down.When the hydrogen atom of substituent R1 on the 5-position of indoline ring is replaced by electron-donating group, the stability of chromophore increases. When substituted by electron-withdrawing group, The stability of the spirooxazine chromophore is also related to the nature of the polymer medium.The higher the polarity of the polymer medium, the greater the rigidity, and the slower the rate of heat elimination of the color former, and vice versa. The kinetics of thermal colorimetry conforms to the double exponential decay law