Nonwoven polymer matrices

Poly(vinyl pyrrolidone) (PVP) was used by Nguyen et al. as a polymer matrix to prepare electrically conducting nano(micro)poly(3,4-ethylenedioxythiophene) (PEDOT) fiber non-woven web [50]. The electrical conductivity of the electrospun PEDOT non woven web was as high as 7.5 S cm when 1-propanol was used as the solvent. An electrochemical capacitor was assembled using one pair of the PEDOT nonwoven webs as the electrodes by a simple stack method, where metal plates were used as current collectors. They observed the electrochemical charge and discharge behavior of the capacitor, confirming that the PEDOT nonwoven web can be used as an electrode for flexible electrochemical capacitors. 

Reinforcing fillers are often fibers or films that exhibit better mechanical and thermomechanical properties than the polymer matrix and develop strong molecular interactions with it. Upon mixing such fillers with polymers, materials called composites are obtained. Due the single orientation of fibers, the improvement in the mechanical properties is observed in one direction. To overcome this drawback, nonwoven fibers and fabrics can be utilized as bi-dimensional reinforcing fillers. 

The term filler in the present context is used for describing those inert, solid materials which are physically dispersed in the pol3mtier matrix, without significantly affecting the molecular structure of the polymer. Further, the term is restricted to those materials which are in the form of discrete particles or of fibers not exceeding a few inches in length. Continuous filaments or fabrics either woven or nonwoven are not included in this category of fillers discussed... 

Chitin-alginate co-polymer Water-soluble chitin-alginate-PEI-DNA nanoparticles Nonwoven fibrous scaffold vehicle for DNA delivery Matrix capable of delivering genes to direct and support cellular development in tissue engineering... 

Most fundamental studies on the impact of immersion precipitation factors have cast membranes on glass supports during the synthesis phase. In the reality of full-scale application, PVDF is cast on a woven or a nonwoven fabric. Therefore, a different membrane behavior is expected. Huo et al. (2009) demonstrated that the woven support thickness is closely related to the optimum PVDF concentration. Below 10% PVDF, the polymer solution was too runny, and thus fully penetrated the support. As a result, a poorly integrated membrane structure was formed, with many big holes defects. On the other hand, when an integrated PVDF matrix was formed, lower concentrations yielded a higher peeling strength. 

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