多偶氮衍生物接枝纤维素纳米晶体的双重光响应和 pH 响应复合材料。,Materials

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多偶氮衍生物接枝纤维素纳米晶体的双重光响应和 pH 响应复合材料。
Materials ( IF 3.1 ) Pub Date : 2018-09-14 , DOI: 10.3390/ma11091725
Xiaohong Liu ₁ , Ming Li ₁ , Xuemei Zheng ₁ , Elias Retulainen ₁ , Shiyu Fu ₁

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作为一种官能团，偶氮衍生物常用于合成响应性材料。通过棉花酸水解制备纤维素纳米晶（CNC），脱水后与2-溴异丁酰溴反应形成大引发剂，接枝6-[4-(4-甲氧基苯基偶氮)苯氧基]甲基丙烯酸己酯（MMAZO）通过原子转移自由基聚合。傅里叶变换红外光谱（FT-IR）和固体磁共振碳谱（MAS 13C-NMR）支持了成功的接枝。通过透射电子显微镜 (TEM) 和 X 射线光电子能谱 (XPS) 证实了聚{6-[4-(4-甲氧基苯基偶氮)苯氧基]甲基丙烯酸己酯} (PMMAZO) 接枝 CNC 的形貌和表面组成。CNCs大分子引发剂上的接枝率超过870%，支化聚合物的多分散性较窄。通过 X 射线衍射 (XRD) 测定，CNC 的晶体结构在接枝后没有改变。热重分析（TGA）显示，聚合物PMMAZO提高了纤维素纳米晶体的热稳定性。然后将PMMAZO接枝的CNC与聚氨酯混合并流延形成复合薄膜。该薄膜表现出显着的光和pH响应，可能适用于视觉酸碱测量和可逆光学存储。

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Dual Light- and pH-Responsive Composite of Polyazo-Derivative Grafted Cellulose Nanocrystals.

As a type of functional group, azo-derivatives are commonly used to synthesize responsive materials. Cellulose nanocrystals (CNCs), prepared by acid hydrolysis of cotton, were dewatered and reacted with 2-bromoisobuturyl bromide to form a macro-initiator, which grafted 6-[4-(4-methoxyphenyl-azo) phenoxy] hexyl methacrylate (MMAZO) via atom transfer radical polymerization. The successful grafting was supported by Fourier transform infrared spectroscopy (FT-IR) and Solid magnetic resonance carbon spectrum (MAS 13C-NMR). The morphology and surface composition of the poly{6-[4-(4-methoxyphenylazo) phenoxy] hexyl methacrylate} (PMMAZO)-grafted CNCs were confirmed with Transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The grafting rate on the macro-initiator of CNCs was over 870%, and the polydispersities of branched polymers were narrow. The crystal structure of CNCs did not change after grafting, as determined by X-ray diffraction (XRD). The polymer PMMAZO improved the thermal stability of cellulose nanocrystals, as shown by thermogravimetry analysis (TGA). Then the PMMAZO-grafted CNCs were mixed with polyurethane and casted to form a composite film. The film showed a significant light and pH response, which may be suitable for visual acid-alkali measurement and reversible optical storage.

更新日期：2019-11-01

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