摘要
采用传统的自由基聚合和聚合后修饰相结合的策略,设计并合成了一种具有不同偶氮苯接枝率的新型聚离子液体(PIL-Azo-x),并系统地研究了其物理化学性质和光学性能.利用紫外-可见分光光度计(UV-Vis)对聚离子液体薄膜的光致异构化、透射光谱、散射光谱和透射雾度进行了详细表征.结果表明,通过简单的浇铸法制备的薄膜具有强紫外屏蔽性能(200～400 nm)、光诱导的透过率可调谐性能(400～600 nm)、高透明度(600～800 nm)、良好的热稳定性和极佳的酸碱稳定性等优点.进一步,结合掩膜版法,该薄膜还可以重复定制不同的透明图案.这种偶氮苯接枝的聚离子液体薄膜有望推动多功能光学涂层、智能窗户等领域的发展.
Abstract
Three kinds of poly(ionic liquid)s(PIL-Azo-x)with different grafting ratios of azobenzene(10％,30％,and 50％)were successfully synthesized by using conventional free radical polymerization and post-polymerization modification strategies.The initial decomposition temperatures of PIL-Azo-x were higher than 300 ℃,indicating good thermal stability.The films prepared by simple casting method exhibited excellent UV shielding performance in the 200-400 nm band,which can block almost all UV rays;in the 400-600 nm band,they have tunable transmittance performance,which can be reversibly changed under the irradiation of 365 nm UV and 450 nm visible light,and the transmittance decreases accordingly with the increase of the content of azobenzene;in the 600-800 nm band,they show a high transmittance performance,which can be reversed with an increase in the content of azobenzene.In addition,the pure PIL-Azo-x casted films have excellent acid and alkali resistance,and the transmission spectra of the films remain almost unchanged after immersion in a pH=2 HCl solution or pH=12 NaOH solution for 6 h,which makes them suitable for the more severe environments.Finally,its application in the field of pattern writing and erasing is demonstrated in combination with the mask plate method,in which the transparent film can be repeatedly customized with different patterns under the irradiation of 365 nm UV light and 450 nm visible light.These poly(ionic liquid)films with strong UV shielding,tunable transmittance,high transparency,good thermal stability,and excellent acid-base stability are expected to contribute to the development of multifunctional optical coatings,smart windows,and other fields.
维普
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