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首页> 外文期刊>ACS applied materials & interfaces >Responsive PET Nano/Microfibers via Surface-Initiated Polymerization
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Responsive PET Nano/Microfibers via Surface-Initiated Polymerization

机译：通过表面引发的聚合反应制备PET纳米/超细纤维

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摘要

Poly(ethylene terephthalate) (PET) is one of the most important thermoplastics in ubiquitous use today because of its mechanical properties, clarity, solvent resistance, and recyclability. In this work, we functionalize the surface of electrospun PET microfibers by growing poly(N-isopropylacrylamide) (PNIPAAm) brushes through a chemical sequence that avoids PET degradation to generate thermoresponsive microfibers that remain mechanically robust. Amidation of deposited 3-aminopropykriethoxysilane, followed by hydrolysis, yields silanol groups that permitsurface attachment of initiator molecules, which can be used to grow PNIPAAm via "grafting from" atom-transfer radical polymerization. Spectroscopic analyses performed after each step confirm the expected reaction and the ultimate growth of PNIPAAm brushes. Water contact-angle measurements conducted at temperatures below and above the lower critical solution temperature of PNIPAAm, coupled with adsorption of Au nanoparticles from aqueous suspension, demonstrate that the brushes retain their reversible thermoresponsive nature, thereby making PNIPAAm-functionalized PET microfibers suitable for filtration media, tissue scaffolds, delivery vehicles, and sensors requiring robust microfibers.
机译：聚对苯二甲酸乙二醇酯（PET）由于其机械性能，透明度，耐溶剂性和可回收性，是当今无处不在的最重要的热塑性塑料之一。在这项工作中，我们通过使聚N-异丙基丙烯酰胺（PNIPAAm）刷子通过化学顺序生长来功能化电纺PET超细纤维的表面，该化学顺序可避免PET降解而产生保持机械强度的热响应性超细纤维。沉积的3-氨基丙氧基乙氧基硅烷进行酰胺化，然后水解，生成硅烷醇基团，该硅烷醇基团允许引发剂分子的表面附着，可用于通过“从原子转移自由基聚合中接枝”来生长PNIPAAm。在每个步骤之后进行的光谱分析证实了预期的反应和PNIPAAm刷子的最终生长。在低于和高于PNIPAAm的较低临界溶液温度的温度下进行的水接触角测量，再加上从水性悬浮液中吸附的金纳米颗粒，表明刷子保持了可逆的热响应性，从而使PNIPAAm功能化的PET超细纤维适合用作过滤介质，需要坚固的超细纤维的组织支架，运载工具和传感器。

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