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首页> 外文期刊>ACS Macro Letters >Photoinduced Sequence-Controlled Copper-Mediated Polymerization: Synthesis of Decablock Copolymers
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Photoinduced Sequence-Controlled Copper-Mediated Polymerization: Synthesis of Decablock Copolymers

机译：光诱导的序列控制的铜介导的聚合：十嵌段共聚物的合成

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摘要

Photoinitiated copper-mediated radical polymerization offers an one-pot and time efficient method of preparing a decablock copolymer PMA-PtBA-PMA-PDEGA-PMA-PtBA-PMA-PDEGA-PnBA- PDEGA with an overall molecular weight of 8500 g·mol ~(-1) . The molecular weight is in close agreement with theoretical expectations and significantly narrow dispersities (? = 1.1-1.17) are achieved for the various block extensions. The tert-butyl group of the decadeblock was deprotected to form PMA-PAA-PMA-PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA. The deprotection is confirmed by the disappearance of tert-butyl signal and the loss of molecular weight investigated by ~1 H NMR and SEC, respectively. The carboxylic group of PAA is protonated in acidic solution (water insoluble) and deprotonated in basic solution (water-soluble). This enables a conformational change of PMA-PAA-PMA- PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA in water/ethanol mixture (80/20%v/v), as is demonstrated by a turbid solution at pH 2 and transparent solutions at pH 10.
机译：光引发的铜介导的自由基聚合为制备十嵌段共聚物PMA-PtBA-PMA-PDEGA-PMA-PtBA-PMA-PDEGA-PnBA-PDEGA提供了一种一锅又省时的方法，总分子量为8500 g·mol〜 （-1）。分子量与理论预期值非常一致，并且对于各种嵌段延伸，获得了非常窄的分散度（η= 1.1-1.17）。十嵌段的叔丁基被去保护形成PMA-PAA-PMA-PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA。通过叔丁基信号的消失和分别通过〜1 H NMR和SEC研究的分子量损失来确认脱保护。 PAA的羧基在酸性溶液中质子化（不溶于水），在碱性溶液中质子化（水溶性）。这可以使水/乙醇混合物（80/20％v / v）中的PMA-PAA-PMA-PDEGA-PMA-PAA-PMA-PDEGA-PnBA-PDEGA发生构象变化，如pH 2的混浊溶液所示pH值为10的透明溶液。

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