Aza‐Michael Addition Chemistry for Tuning the Phase Separation of PDMS/PEG Blend Coatings and Their Anti‐Fouling Potentials,Macromolecular Chemistry and Physics

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Aza‐Michael Addition Chemistry for Tuning the Phase Separation of PDMS/PEG Blend Coatings and Their Anti‐Fouling Potentials
Macromolecular Chemistry and Physics ( IF 2.5 ) Pub Date : 2020-02-13 , DOI: 10.1002/macp.201900477
Yunjiao Gu ₁ , Shuxue Zhou ₁ , Jinlong Yang ₂

Affiliation

Free adjustment of micro/nanophase‐separation degrees in coatings is not easily accessible, which is a big handicap in the development of phase‐separation‐related applications. Here, by utilizing the reactivity difference between two phases, a two‐step aza‐Michael addition pre‐crosslinking strategy, demonstrated by acryloxy‐terminated polydimethylsiloxane/polyethylene glycol (PEG) blend coatings, is proposed for the first time to tune microphase separation degrees, and promote compatibility of the biphasic amphiphilic polymer blends. Followed by a systematic study of the two‐step pre‐crosslinking time, surface morphologies of samples with desired phase‐separation degrees are unveiled using optical microscopy, AFM, and XPS. The wettability, and anti‐fouling properties — for example, anti‐protein and anti‐marine bacterial (Shewanella) adhesion — of these coatings are assessed. Less protein adsorption is observed on those surfaces with lower receding water contact angles. Shewanella adhesion is efficiently discouraged by the introduction of PEG segments, but the trend evolved with surface wettability and micro/nanophase structure in a complex way.

中文翻译：

用于调整PDMS / PEG共混涂层的相分离及其抗污垢潜力的Aza-Michael加成化学

不容易获得涂层中微/纳米相分离度的自由调节，这在相分离相关应用的开发中是一个很大的障碍。在这里，通过利用两相之间的反应性差异，可以进行两步氮杂首次提出了以丙烯酰氧基封端的聚二甲基硅氧烷/聚乙二醇（PEG）共混涂料为代表的迈克尔加成预交联策略，以调节微相分离度，并促进两相两亲聚合物共混物的相容性。在对两步预交联时间进行系统研究之后，使用光学显微镜，AFM和XPS揭示了具有所需相分离度的样品表面形态。评估了这些涂层的润湿性和防污性能，例如抗蛋白质和抗海洋细菌（希瓦氏菌）的附着力。在水接触角较小的那些表面上观察到较少的蛋白质吸附。希瓦内拉 PEG段的引入有效地阻止了粘附，但是这种趋势随着表面润湿性和微/纳米相结构的复杂发展而发展。

更新日期：2020-02-13

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