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Unique aqueous self-assembly behavior of a thermoresponsive diblock copolymer
Chemical Science ( IF 7.6 ) Pub Date : 2019-11-12 , DOI: 10.1039/c9sc04197d Sarah J Byard 1 , Cate T O'Brien 1 , Matthew J Derry 1 , Mark Williams 1 , Oleksandr O Mykhaylyk 1 , Adam Blanazs 2 , Steven P Armes 1
Chemical Science ( IF 7.6 ) Pub Date : 2019-11-12 , DOI: 10.1039/c9sc04197d Sarah J Byard 1 , Cate T O'Brien 1 , Matthew J Derry 1 , Mark Williams 1 , Oleksandr O Mykhaylyk 1 , Adam Blanazs 2 , Steven P Armes 1
Affiliation
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It is well-recognized that block copolymer self-assembly in solution typically produces spheres, worms or vesicles, with the relative volume fraction of each block dictating the copolymer morphology. Stimulus-responsive diblock copolymers that can undergo either sphere/worm or vesicle/worm transitions are also well-documented. Herein we report a new amphiphilic diblock copolymer that can form spheres, worms, vesicles or lamellae in aqueous solution. Such self-assembly behavior is unprecedented for a single diblock copolymer of fixed composition yet is achieved simply by raising the solution temperature from 1 °C (spheres) to 25 °C (worms) to 50 °C (vesicles) to 70 °C (lamellae). Heating increases the degree of hydration (and hence the effective volume fraction) of the core-forming block, with this parameter being solely responsible for driving the sphere-to-worm, worm-to-vesicle and vesicle-to-lamellae transitions. The first two transitions exhibit excellent reversibility but the vesicle-to-lamellae transition exhibits hysteresis on cooling. This new thermoresponsive diblock copolymer provides a useful model for studying such morphological transitions and is likely to be of significant interest for theoretical studies.
中文翻译：
热响应二嵌段共聚物独特的水自组装行为
众所周知，嵌段共聚物在溶液中自组装通常会产生球体、蠕虫或囊泡，每个嵌段的相对体积分数决定了共聚物的形态。可以经历球体/蠕虫或囊泡/蠕虫转变的刺激响应二嵌段共聚物也有充分记录。在此，我们报道了一种新的两亲性二嵌段共聚物，它可以在水溶液中形成球体、蠕虫、囊泡或片层。这种自组装行为对于固定组成的单一二嵌段共聚物来说是前所未有的，但只需将溶液温度从 1 °C（球体）提高到 25 °C（蠕虫）到 50 °C（囊泡）到 70 °C（片层）。加热增加了核心形成块的水合程度（从而增加了有效体积分数），该参数仅负责驱动球体到蠕虫、蠕虫到囊泡以及囊泡到片层的转变。前两个转变表现出优异的可逆性，但囊泡到片层的转变在冷却时表现出滞后性。这种新型热响应二嵌段共聚物为研究这种形态转变提供了一个有用的模型，并且可能对理论研究具有重要意义。
更新日期：2019-11-12
中文翻译：
热响应二嵌段共聚物独特的水自组装行为
众所周知，嵌段共聚物在溶液中自组装通常会产生球体、蠕虫或囊泡，每个嵌段的相对体积分数决定了共聚物的形态。可以经历球体/蠕虫或囊泡/蠕虫转变的刺激响应二嵌段共聚物也有充分记录。在此，我们报道了一种新的两亲性二嵌段共聚物，它可以在水溶液中形成球体、蠕虫、囊泡或片层。这种自组装行为对于固定组成的单一二嵌段共聚物来说是前所未有的，但只需将溶液温度从 1 °C（球体）提高到 25 °C（蠕虫）到 50 °C（囊泡）到 70 °C（片层）。加热增加了核心形成块的水合程度（从而增加了有效体积分数），该参数仅负责驱动球体到蠕虫、蠕虫到囊泡以及囊泡到片层的转变。前两个转变表现出优异的可逆性，但囊泡到片层的转变在冷却时表现出滞后性。这种新型热响应二嵌段共聚物为研究这种形态转变提供了一个有用的模型，并且可能对理论研究具有重要意义。
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