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合成了3种新型螺噁嗪类化合物(SP1~SP3),其分子结构中分别带有不同碳链长度的同类型取代基—(CH2)nBr;利用其活性基团C-Br与部分水解的聚甲基丙烯酸甲酯(h PMMA)反应制备了含SP1~SP3官能基的PMMA光致变色功能高分子材料(SP1~SP3-h PMMA).采用1H-NMR和IR对SP1~SP3结构进行了表征.研究了SP1~SP3及SP1~SP3-h PMMA的光致变色性能及其影响因素;研究了酸的加入和PMMA的水解率对SP1~SP3-h PMMA光致变色性能及热稳定性的影响.研究结果表明,与SP1、SP2比较,含最长碳链的SP3表现出优良的光敏感性和热稳定性;SP1~SP3-h PMMA的热稳定性均明显高于相应的SP1~SP3;盐酸的加入有利于提高SP-h PMMA的热稳定性;以水解率为9%的PMMA制备的SP3-9%h PMMA具有优异的光致变色性能和热稳定性.
Three novel spirooxazine compounds (SP1 ~ SP3) were synthesized. Their molecular structures were the same type of substituents - (CH2) nBr with different carbon chain lengths. Their active groups C-Br and partially hydrolyzed (SP1 ~ SP3-h PMMA) with SP1 ~ SP3 functional groups were prepared by the reaction of poly (methyl methacrylate) (h PMMA) .The structure of SP1 ~ SP3 was characterized by 1H-NMR and IR The photochromic properties of SP1 ~ SP3 and SP1 ~ SP3-h PMMA were investigated. The effects of the addition of acid and the hydrolysis rate of PMMA on the photochromic properties and thermal stability of SP1 ~ SP3-h PMMA .The results showed that compared with SP1 and SP2, SP3 with the longest carbon chain showed excellent photosensitivity and thermal stability. The thermal stability of SP1 ~ SP3-h PMMA was significantly higher than that of SP1 ~ SP3 ; Addition of hydrochloric acid is beneficial to improve the thermal stability of SP-h PMMA; SP3-9% h PMMA prepared by PMMA with a hydrolysis rate of 9% has excellent photochromic properties and thermal stability.