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首页> 美国卫生研究院文献>International Journal of Molecular Sciences >Thermo-Responsive Polymer Brushes with Side Graft Chains: Relationship Between Molecular Architecture and Underwater Adherence
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Thermo-Responsive Polymer Brushes with Side Graft Chains: Relationship Between Molecular Architecture and Underwater Adherence

机译：带有侧接链的热敏聚合物刷：分子结构与水下附着力之间的关系

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摘要

During the last few decades, wet adhesives have been developed for applications in various fields. Nonetheless, key questions such as the most suitable polymer architecture as well as the most suitable chemical composition remain open. In this article, we investigate the underwater adhesion properties of novel responsive polymer brushes with side graft chain architecture prepared using “ ” approach on flat surfaces. The incorporation in the backbone of thermo-responsive poly( -isopropylacrylamide) (PNIPAm) allowed us to obtain LCST behavior in the final layers. PNIPAm is co-polymerized with poly(methyl ethylene phosphate) (PMEP), a poloyphosphoester. The final materials are characterized studying the surface-grafted polymer as well as the polymer from the bulk solution, and pure PNIPAm brush is used as reference. PNIPAm-g-PMEP copolymers retain the responsive behavior of PNIPAm: when T > LCST, a clear switching of properties is observed. More specifically, all layers above the critical temperature show collapse of the chains, increased hydrophobicity and variation of the surface charge even if no ionizable groups are present. Secondly, effect of adhesion parameters such as debonding rate and contact time is studied. Thirdly, the reversibility of the adhesive properties is confirmed by performing adhesion cycles. Finally, the adhesive properties of the layers are studied below and above the LCST against hydrophilic and hydrophobic substrates.
机译：在过去的几十年中，已经开发了湿粘合剂用于各种领域。尽管如此，诸如最合适的聚合物结构以及最合适的化学组成等关键问题仍然存在。在本文中，我们研究了使用“”方法在平坦表面上制备的具有侧接链结构的新型响应式聚合物刷的水下附着性能。热响应性聚（-异丙基丙烯酰胺）（PNIPAm）骨架中的结合使我们能够在最终层中获得LCST行为。 PNIPAm与一种聚磷酸酯聚（甲基丙烯酸乙二酯）（PMEP）共聚。通过研究表面接枝的聚合物以及本体溶液中的聚合物来表征最终材料，并使用纯PNIPAm刷作为参考。 PNIPAm-g-PMEP共聚物保留了PNIPAm的响应行为：当T> LCST时，观察到明显的性能切换。更具体地，即使不存在可电离基团，在临界温度以上的所有层都显示链的塌陷，增加的疏水性和表面电荷的变化。其次，研究了粘合参数如脱胶率和接触时间的影响。第三，通过进行粘合循环来确认粘合性的可逆性。最后，研究了在LCST下方和上方对亲水性和疏水性基材的粘合性能。

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