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Overview of the effect of monomers and green solvents on thermoresponsive copolymers: phase transition temperature and surface properties

机译：单体和绿色溶剂对热响应共聚物影响的概述：相转变温度和表面性质

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The present study explores the effect of the monomer substitution pattern of different copolymers on their volume phase transition temperature (VPTT) and surface wetting properties (SWPs) with the aid of differential scanning calorimetry (DSC), contact angle (CA), scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy (FT-IR) measurements. The present experimental results unveil that the VPTT and SWPs were greatly governed by the ability of the neighboring side chains to form intramolecular hydrogen bonds and the hydrophobic-hydrophilic balance of the polymer. The substitution of some of the acrylic acid (AA) monomers in the copolymer hydrogel P(NIPAM-co-AA) by the polyethyleneglycolmethacrylate (PEGMA) monomer resulted in the copolymer hydrogel, P(NIPAM-co-PEGMA-co-AA). The PEGMA in P(NIPAM-co-PEGMA-co-AA) can promote the intermolecular hydrogen bonds of the copolymer with the water molecules and thus hinders the formation of the intramolecular hydrogen bonds. Consequently, the VPTT of the P(NIPAM-co-PEGMA-co-AA) occurs at higher temperatures when compared to the P(NIPAM-co-AA) and P(NIPAM-co-PEGMA) systems. Further, in view of the potential applications of ionic liquids (IL) in polymer science, the effect of IL on the VPTT and SWP of the copolymers was investigated. The knowledge from this study can pave the way to engineer stimuli responsive polymers for a wide range of applications in the modern era.
机译：本研究借助于差示扫描量热法（DSC），接触角（CA），扫描电子显微镜，扫描电子显微镜，扫描电子显微镜，探讨了不同共聚物的单体取代模式对体积相转变温度（VPTT）和表面润湿性能（SWPS）的影响。 （SEM）和傅里叶变换 - 红外光谱（FT-IR）测量。本实验结果揭示了VPTT和SWPS极大地通过相邻侧链形成分子内氢键和聚合物的疏水亲水性平衡的能力。通过聚乙二醇丙烯酸乙酯（PEGMA）单体取代共聚物水凝胶P（NIPAM-CO-AA）中的一些丙烯酸（AA）单体，得到共聚物水凝胶，P（NIPAM-CO-PEGMA-CO-AA）。 P中的PEGMA（NIPAM-CO-PEGMA-CO-AA）可以促进与水分子的共聚物的分子间氢键，因此阻碍了分子内氢键的形成。因此，与P（NIPAM-CO-AA）和P（NIPAM-CO-PEGMA）系统相比，P（NIPAM-CO-CO-CO-CO-AA）的VPTT发生在较高温度下。此外，考虑到离子液体（IL）在聚合物科学中的潜在应用，研究了IL对共聚物VPTT和SWP的影响。本研究中的知识可以为现代时代的各种应用提供工程师刺激响应聚合物。

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