Author: Yang Weiqiao Sousa Ana M. M. Thomas-Gahring Audrey Fan Xuetong Jin Tony Li Xihong Tomasula Peggy M. Liu LinShu
Publisher: MDPI
E-ISSN: 1996-1944|9|9|757-757
ISSN: 1996-1944
Source: Materials, Vol.9, Iss.9, 2016-09, pp. : 757-757
Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.
Abstract
We report the successful preparation of reinforced electrospun nanofibers and fibrous mats of polyvinyl alcohol (PVA) via a simple and inexpensive method using stable tannic acid (TA) and ferric ion (Fe+++) assemblies formed by solution mixing and pH adjustment. Changes in solution pH change the number of TA galloyl groups attached to the Fe+++ from one (pH < 2) to two (3 < pH < 6) to three (pH < 7.4) and affect the interactions between PVA and TA. At pH ~ 5.5, the morphology and fiber diameter size (FDS) examined by SEM are determinant for the mechanical properties of the fibrous mats and depend on the PVA content. At an optimal 8 wt % concentration, PVA becomes fully entangled and forms uniform nanofibers with smaller FDS (
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