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首页> 外文期刊>Journal of Applied Polymer Science >Thermo-responsive polyurethane hydrogels based on poly(ethylene glycol) and poly(caprolactone): Physico-chemical and mechanical properties
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Thermo-responsive polyurethane hydrogels based on poly(ethylene glycol) and poly(caprolactone): Physico-chemical and mechanical properties

机译：基于聚乙二醇和聚己内酯的热敏聚氨酯水凝胶：理化性质和机械性质

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In this work, we present the synthesis and characterization of chemically crosslinked polyurethanes (PU) composed of poly(ethylene glycol) (PEG) and poly(caprolactone) diol (PCL-diol), as hydrophilic and hydrophobic segments respectively, poly(caprolactone) triol (PCL-triol), to induce hydrolysable crosslinks, and hexamethylene diisocyanate (HDI). The syntheses were performed at 45 degrees C, resulting in polyurethanes with different PEG/PCL-diol/PCL-triol mass fractions. All the PUs are able to crystallize and their thermal properties depend on the global composition. The water uptake capacities of the PU increase as the PEG amount increases. The water into hydrogels is present in different environments, as bounded, bulk and free water. The PU hydrogels are thermo-responsive, presenting a negative dependence of the water uptake with the temperature for PEG rich networks, which gradually changes to a positive behavior as the amount of poly(caprolactone) (PCL) segments increases. However, the water uptake capacity changes continuously without an abrupt transition. Scanning electron microscopy (SEM) analyses of the hydrogel morphology after lyophilization revealed a porous structure. Mechanical compression tests revealed that the hydrogels present good resilience and low recovery hysteresis when they are subject to cycles of compression-decompression. In addition, the mechanical properties of the hydrogels varies with the composition and crosslinking density, and therefore with the water uptake capacity. The PU properties can be tuned to fit for different applications, such as biomedical applications. (c) 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43573.
机译：在这项工作中，我们介绍了由聚（乙二醇）（PEG）和聚（己内酯）二醇（PCL-二醇）组成的化学交联聚氨酯（PU）的合成和表征，分别作为亲水和疏水链段，聚（己内酯）三醇（PCL-三醇）和六亚甲基二异氰酸酯（HDI）来诱导可水解的交联。合成在45℃下进行，得到具有不同PEG / PCL-二醇/ PCL-三醇质量分数的聚氨酯。所有PU都能够结晶，并且它们的热性能取决于整体组成。 PU的吸水能力随着PEG量的增加而增加。进入水凝胶的水存在于不同的环境中，包括有约束的，散装的和自由的水。 PU水凝胶具有热响应性，对富含PEG的网络而言，吸水率随温度呈负相关关系，随着聚己内酯（PCL）片段数量的增加，其逐渐变为正行为。但是，吸水量连续变化而不突然变化。冻干后水凝胶形态的扫描电子显微镜（SEM）分析显示出多孔结构。机械压缩测试表明，当水凝胶经受压缩-减压循环时，它们表现出良好的回弹性和低恢复滞后性。另外，水凝胶的机械性能随组成和交联密度而变化，并因此随吸水能力变化。可以调整PU属性以适合不同的应用程序，例如生物医学应用程序。 （c）2016 Wiley Periodicals，Inc. J. Appl。 Polym。科学2016，133，43573。

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