Electrospinning of PLA

LAURA PEPONI, ALICIA MUJICA-GARCIA AND JOSE M. KENlSn  

Poly(lactic acid) Science and Technology Processing, Properties, Additives and Applications 

Edited by Alfonso Jimenez, Mercedes Peltzer and Roxana Ruseckaite 

Finally, depending on the needle used, that is simple or concentric, we refer to conventional or coaxial electrospinning, respectively. In general, two groups of parameters have to be taken into account in order to optimize the electrospinning process (i) those related to the solution properties, such 

Melt electrospun PLA sub-micron fibre mats with no residual solvent can be employed as filter media and tissue scaffolds preferred to those prepared by solution electrospinning processes, due to the elimination of possible 

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Electrospinning of PLA and copolymers [12] and the PLA stereocomplex [145,146] has been used to prepare nanofibres or nanomats. Similar to the effect of pores on the mechanical properties of PLA-based materials, the formation of nanomats effectively lowers the E and elevates the 8b value. The morphology of the fibres and nanomats and the mechanical properties are affected by the applied voltage, the effluent rate and concentration of the solution, the type of solvent and so on (Figure 8.12 [147]). 

Haroosh H.J., Chaudhary D., and Yusa S. (2011) Effect of halloysite on electrospinning of PLA/PCL nanofibres. Proceedings of CHEMECA 2011 Conference, Sydney, Austraha, September 18-21, 2011. 

Haroosh, H.J., Chaudhary, D.S., Yusa, S.-I., 2011d. Effect of baUoysite on electrospinning of PLA/PCL nanofibres. In CHEMECA 2011 Engineering a Better World. Sydney Hilton Hotel, NSW, Australia, September 18—21, 2011, p. 474. 

The materials are obtained by electrospinning solutions containing tetracycline along with PLA, ethylene vinyl acetate (EVA) or a combination of PLA and EVA. The release of tetracycline hydrochloride was determined by spectroscopic measurements. 

On the basis of the DSC data summarized in Table 8.3, the crystallization temperature (T ) of PLA fibers becomes lower than that of as-received PLA pellets. It is convincing that the crystallization process can be accelerated by the well-structured PLA molecular chains when tailored into the fiber-like form. By decreasing HMW PCL concentration from 15 to 9wt%/v, the glass transition temperature (T ) of PCL within PLA/PCL blends is reduced whereas the of PLA is hardly identified in that its point has overlapped the melting peak of PCL. The different thermal properties in terms of and melting temperature (T ) may be influenced by the variation of fiber diameters as well as electrospinning process for the orientation of polymer chains [32]. In comparison to HMW PCL with PLA in blends, LMW PCL gives rise to an evident increase in the of PLA, but a considerable decline in the of PCL. The solvent effect on thermal... 

In order to prepare PLA nanocomposites with highly dispersed cellulose nanocrystals and porous PLA-based scaffolds with enhanced mechanical properties and thermal stability, CNCs have been incorporated into PLA fibres by electrospinning method. Fibrous biocomposite mats consisting of PLA and CNCs have been electrospun from solvent or solvent mixtures such as l,l,l,3,3,3-hexafluoro-2-propanol (HFP), DMF/chloro-form and DMF/tetrahydrofuran (THF). The electrospun PLA/CNCs bionanocomposites have demonstrated rapid in vitro biodegradability and cytocompatible properties, and could be potentially suitable in tissue engineering. ... 

PLA/inorganic nanosize layered double hydroxides (LDH) has been successfully obtained by the method of electrospinning. LDH particles are dispersed evenly and uniformly in PLA matrix. The number average molecular weight of the eletrospun PLA fibers does not change remarkably while the melting point of PLA decreases upon the increase of LDH content, which suggests that the PLA/LDH composite material may have prospective application as the basis of environmental friendly systems [68]. 

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