Utilization of surface differences to improve dyeing properties of poly(m-phenylene isophthalamide) membranes
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Bulk poly(m-phenylene isophthalamide) (PMIA) can achieve flexibility upon dissolution by a LiCl/dimethylacetamide co-solvent, but remains hydrophobic despite the occasional emergence of cis amide groups providing a weak negative charge. In this study, based on the significant surface differences between PMIA membranes processed by nanofiber electrospinning and casting, a series of chemical analyses, in-situ Au nanoparticle depositions, and dye-adsorption experiments revealed that more cis-configuration amide groups appeared on the surface of the electrospun PMIA membrane than on that of the cast membrane. Based on this surface difference, a strategy was proposed to improve the dyeing properties of PMIA by reversibly changing the cis/trans configurations of electrospun and cast membranes. The reversible chain-segment switch mechanism is a novel method for tuning the macroscale properties of polymer materials based on inherent molecular characteristics.
Keywordswettability polymer surface difference electrospun PMIA interfaces
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We thank the National Natural Science Foundation of China (Grant Nos. 51471153 and 51372227) and the 521 Talent Project of Zhejiang Sci-Tech University, Science and Technology Department of Zhejiang Province Foundation (No. 2017C37017) for providing financial support.
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