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Temperature responsive poly(phosphonate) copolymers: from single chains to macroscopic coacervates†
Polymer Chemistry ( IF 4.6 ) Pub Date : 2017-12-19 00:00:00 , DOI: 10.1039/c7py01811h
Thomas Wolf 1, 2, 3 , Johannes Hunold 3, 4, 5, 6 , Johanna Simon 1, 2, 3 , Christine Rosenauer 1, 2, 3 , Dariush Hinderberger 3, 4, 5, 6 , Frederik R. Wurm 1, 2, 3
Affiliation  

We present the first series of random poly(ethylene alkyl phosphonate) copolymers with either high solubility in water or a finely tunable hydrophilic-to-hydrophobic phase transition upon heating (“LCST”). Polymerization via the organocatalytic anionic ring-opening polymerization provided high control over molecular weight (up to 23 000 g mol−1) and copolymer composition, and resulted in narrow molecular weight distribution (Đ < 1.3). Polymers of molecular weights up to 23 000 g mol−1 were obtained. The phase separation temperature was precisely adjusted in a range from 55 °C to 6 °C in water, depending on the copolymer composition. The phase transition mechanism was thoroughly investigated at different length scales via electron paramagnetic resonance spectroscopy (EPR), dynamic light scattering (DLS), UV-Vis spectroscopy and confocal laser scanning microscopy (cLSM), proving the step-wise formation of aggregates close to the cloud point temperature up to macroscopic coacervates.

中文翻译:

温度响应性聚膦酸酯共聚物:从单链到宏观凝聚层

我们提出了第一系列的无规聚(乙烯烷基膦酸酯)共聚物,它们在水中具有高溶解度,或者在加热时具有可微调的亲水性至疏水性相变(“ LCST”)。通过有机催化阴离子开环聚合进行的聚合提供了对分子量(最高23000 g mol -1)和共聚物组成的高度控制,并导致窄的分子量分布(Đ <1.3)。获得了分子量高达23000 g mol -1的聚合物。根据共聚物的组成,在水中精确地将相分离温度调节在55℃至6℃的范围内。通过不同的长度尺度对相变机理进行了深入研究。 电子顺磁共振光谱(EPR),动态光散射(DLS),紫外-可见光谱和共聚焦激光扫描显微镜(cLSM),证明了聚集体逐步形成并接近浊点温度,直至形成宏观凝聚层。
更新日期:2017-12-19
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