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Photoresponsive nanostructures of azobenzene-containing block copolymers at solid surfaces
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-12-08 , DOI: 10.1039/d1py01452h
Shaodong Sun 1 , Chenrui Yuan 1 , Zhulu Xie 1 , Wen-Cong Xu 1 , Qijin Zhang 1 , Si Wu 1
Polymer Chemistry ( IF 4.1 ) Pub Date : 2021-12-08 , DOI: 10.1039/d1py01452h
Shaodong Sun 1 , Chenrui Yuan 1 , Zhulu Xie 1 , Wen-Cong Xu 1 , Qijin Zhang 1 , Si Wu 1
Affiliation
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The self-assembly properties and photoresponsive behaviours of an azobenzene-containing block copolymer poly(acrylic acid-block-6-(4-(p-tolyldiazenyl)phenoxy)hexyl acrylate) (PAA-b-PAzo) are reported. As azobenzene has reversible trans–cis photoisomerization abilities, trans PAA-b-PAzo solutions were converted into cis PAA-b-PAzo solutions via UV irradiation. Thus, trans or cis PAA-b-PAzo films were prepared after spin-coating the associated solutions on freshly cleaned silicon wafers. The trans PAA-b-PAzo films self-assembled to produce a hemimicelle morphology with the PAA blocks as the matrix and PAzo blocks as the dispersed phase, which was driven by microphase separation. In contrast, the cis PAA-b-PAzo films generated nanostructures with smaller sizes than the trans PAA-b-PAzo thin films. Moreover, when under UV illumination for 10 min, the island-like hemimicelle assemblies in the trans PAA-b-PAzo films fused into a chain-like morphology based on the photoinduced solid-to-liquid transitions at the nanoscale. Our findings suggest a new method to control the microphase separation and morphologies of block copolymers.
中文翻译：
固体表面含偶氮苯嵌段共聚物的光响应纳米结构
报道了含偶氮苯嵌段共聚物聚（丙烯酸-嵌段-6-（4-（对甲苯基二氮烯基）苯氧基）己基丙烯酸酯）（PAA- b- PAzo）的自组装性能和光响应行为。偶氮苯具有可逆的反式-顺式光异构化的能力，反式PAA- b -PAzo溶液转化成顺式PAA- b -PAzo溶液通过UV照射。因此，反式或顺式PAA- b- PAzo 薄膜是在将相关溶液旋涂在新清洁的硅片上之后制备的。这反式PAA - b -PAzo 薄膜自组装产生半胶束形态，以 PAA 嵌段为基质，PAzo 嵌段为分散相，由微相分离驱动。相比之下，顺式PAA- b -PAzo 薄膜产生的纳米结构比反式PAA- b -PAzo 薄膜的尺寸更小。此外，当在紫外线照射下 10 分钟时，反式PAA- b- PAzo 膜中的岛状半胶束组件融合成基于纳米级光致固液转变的链状形态。我们的研究结果提出了一种控制嵌段共聚物微相分离和形态的新方法。
更新日期：2021-12-17
中文翻译：
固体表面含偶氮苯嵌段共聚物的光响应纳米结构
报道了含偶氮苯嵌段共聚物聚（丙烯酸-嵌段-6-（4-（对甲苯基二氮烯基）苯氧基）己基丙烯酸酯）（PAA- b- PAzo）的自组装性能和光响应行为。偶氮苯具有可逆的反式-顺式光异构化的能力，反式PAA- b -PAzo溶液转化成顺式PAA- b -PAzo溶液通过UV照射。因此，反式或顺式PAA- b- PAzo 薄膜是在将相关溶液旋涂在新清洁的硅片上之后制备的。这反式PAA - b -PAzo 薄膜自组装产生半胶束形态，以 PAA 嵌段为基质，PAzo 嵌段为分散相，由微相分离驱动。相比之下，顺式PAA- b -PAzo 薄膜产生的纳米结构比反式PAA- b -PAzo 薄膜的尺寸更小。此外，当在紫外线照射下 10 分钟时，反式PAA- b- PAzo 膜中的岛状半胶束组件融合成基于纳米级光致固液转变的链状形态。我们的研究结果提出了一种控制嵌段共聚物微相分离和形态的新方法。
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