Electrospun fibrous structure

Marras SI, Kladi KP, Tsivintzelis I, Zuburtikudis I, Panayiotou C (2008) Biodegradable polymer nanocomposites the role of nanoclays on the thermomechanical characteristics and the electrospun fibrous structure. Acta Biomaterialia 4 756-765... 

The electrospinning of poly(s-caprolactone) (PCL) solutions have been reported by Reneker et al. [74]. They varied the PCL solution concentrations between 14 and 18 wt%. The instability in the electrospinning of PCL results in the contact and merging of segments in different loops of the electrospinning jet to form garlandlike fibrous structures [74]. Yoshimoto et al. [75] have studied the potential of electrospun PCL fiber mats for use in bone tissue engineering. They found that the... 

Cheng Mei-Ling, Chen Po-Ya, Lan Chin-Hung, Sun Yi-Ming, Structure, mechanical properties and degradation behaviors of the electrospun fibrous blends of PHBHHx/ PDLLA. Polym. 2011, doi 10.1016/j.polymer.2011.01.039 in press. 

Cheng, Mei-Ling, Chen, Po-Ya., Lan Chin-Hung, Sun Yi-Ming. (2011). Structure, Mechanical Properties and Degradation Behaviors of the Electrospun Fibrous Blends of PHBHHx/PDLLA. Polymer, 52, 6587-6594. 

One of the limitations of electrospun collagen as bone-like fibrous structure is the potential collagen triple hetix denaturation in the fiber state and the corresponding inadequate wet stability even after... 

In Part Two, Chapter 4 describes a general fabrication-characterization route of electrospinning PLA poly(s-caprolactone) (PCL)/HNT composite fibers. The effects of HNTs with or without the modifier 3-aminopropyltriethoxysilane on fiber diameter, morphological structure, thermal properties, crystalline stmctures, and degree of crys-talhnity, as well as the intermolecular interaction of electrospun nanocomposite fibers, are thoroughly studied to provide the appropriate guidance to the controlled drug release associated with fibrous structures. Chapter 5 deals with the synthesis and characterization of CNT hybrid fillers via chemical vapor deposition (CVD) technique for polymer nanocomposites. Optimized synthesis parameters are presented and comparative studies are also conducted between chemical hybrid-filled and physical hybrid-fiUed polymer nanocomposites in terms of their typical applications. 

The nanofiber mat has extremely high specific surface area, adequate porosity and small pores due to their small diameters. The fiber size and morphology depends on various parameters involved in the preparation method. Electrospun fibrous membranes are highly porous structures that can be produced from a number of polymer/solvent combinations. Pore sizes ranging from 0.1 to 6 nm in diameter can be produced from solvent electrospinning. In this study different ways of producing porous sfructures are investigated. Then porosity measurement relationships are reviewed. 

Wu J, Wang N, Wang L, Dong H, Zhao Y, Jiang L (2012) Electrospun porous structure fibrous film with high oil adsorption capacity. ACS Appl Mater Interfaces 4 3207-3212... 

Using a microfluidic device as the nozzle and putting two polymer solutions into the same microfluidic channel side-by-side, Lin et al. (2005b) have electrospun the side-by-side bicomponent nanofibres successfully (Fig. 5.13). The side-by-side fibre morphology can be clearly proved by selective removal of one of the polymer components from the nanofibres. As shown in Fig. 5.14b, when the polyurethane moiety is removed from a polyacrylonitrile-polyurethane (PAN-PU) bicomponent nanofibre, the residual PAN moiety retains its fibrous structure, except that one side is removed from the fibre. 

The effects of molecular weight distribution on the formation of electrospun polystyrene fibers in THF have been studied. A fibrous structure can be obtained at a lower concentration in polydisperse samples than in a monodisperse polymer. The higher moleeular weight fragments may contribute to entanglements even at low eoneentrations and thereby stabilize a fibrous structure. 

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