Humidity Tempering of Polyelectrolyte Complexes
Humidity Tempering of Polyelectrolyte Complexes
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DOI：
10.1021/acs.macromol.8b01367
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发表时间：
2018-12-11
期刊：
影响因子：
5.5
通讯作者：
Peterson, Amy M.
中科院分区：
文献类型：
--
作者：
Lyu, Xuejian;Peterson, Amy M.
水在聚电解质材料的结构和性能中起着重要的作用。本研究探讨了湿度历史对干燥聚电解质复合体(PECs)结构和性能的影响。由聚二烯丙基二甲基氯化铵和聚4-苯磺酸钠溶液组装成聚乙二醇酯，然后在控制湿度的条件下干燥。在较高湿度下(湿度回火)后，所得到的PEC的室温储存弹性模量和弯曲弹性模量都增加。湿空气中的水使PEC增塑，增加了流动性，促进了湿度回火期间的链重组，从而产生了具有更多固有静电键(交联键)和更高模数的结构。在以水为唯一溶剂的室温加工过程中，湿度回火可以使PEC硬度增加35%。基于这些结果，湿度回火被认为是一种在温和的条件下定制聚电解质材料结构和力学性能的新方法，这使得该方法非常适合于生物材料和控制释放。
Water plays an important role in the structure and properties of polyelectrolyte-based materials. In this study, the effect of humidity history on the structure and properties of dried polyelectrolyte complexes (PECs) was explored. PECs were assembled from poly(diallyldimethylammonium chloride) and poly(sodium 4-styrenesulfonate) solutions and then dried under controlled humidity conditions. After exposure to higher humidities (humidity tempering), both room temperature storage modulus and flexural modulus of the resulting PEC increased. Water from the humid air plasticized the PEC, increasing mobility and facilitating chain reorganization during humidity tempering, which resulted in a structure with more intrinsic electrostatic bonds (cross-links) and higher moduli. Humidity tempering can achieve a 35% increase in PEC stiffness during room temperature processing with water as the only solvent. Based on these results, humidity tempering is presented as a novel approach to tailoring the structure and mechanical properties of polyelectrolyte-based materials under mild conditions, which makes this approach very appealing to biomaterials and controlled release.