ÇÖZGEN KARIŞIMLARININ ELEKTROLİF ÇEKİM YÖNTEMİ İLE ÜRETİLMİŞ TERMOPLASTİK POLİÜRETAN NANOLİFLERİNİN MORFOLOJİSİNE ETKİSİ

Year 2015, Volume: 25 Issue: 1, 38 - 46, 01.06.2015

Ahmet Çay E. Perrin Akçakoca Kumbasar Çiğdem Akduman

Abstract

Termoplastik poliüretan (TPU) çözeltilerinin elektrolif çekim yöntemine göre çekilebilirliklerine ve elde edilen termoplastik poliüretan nanoliflerinin morfolojik görünümlerine çözgen karışımlarının etkileri taramalı electron mikroskopu (SEM) ile nitel olarak incelenmiştir. Çözgen olarak N,N-dimetilformamid (DMF), tetrahidrofuran (THF) ve etilasetat (EA) kullanılmıştır. TPU-DMF/THF ve TPU-DMF/EA çözeltileri ve elde edilen nanolifler, TPU-DMF sistemi ile elde edilen nanolifler ile karşılaştırılmıştır. Lif çapları artan THF hacim oranı ile artmıştır. 50/50 ve 40/60 DMF/THF karışımlarında lifler birbirlerie yapışmıştır ve elektrolif çekimi THF’nin düşük iletkenliği ve kaynama noktası ve hazırlanan çözeltilerin yüksek viskozitelerine bağlı olarak zorlaşmıştır. Diğer taraftan, 90/10 ve 80/20 DMF/EA ile hazırlanan çözeltilerden daha ince lif çapı olan nanolifler elde edilmiştir. Bu nedenle TPU çözeltilerini %10 veya %20 EA ile seyreltmek elektrolif çekim yöntemine gore elde edilen nanolifler üzerine olumlu etki yapmaktadır

Keywords

Termoplastik poliüretan, elektrolif çekimi, nanolifler, çözgenler

EFFECTS OF SOLVENT MIXTURES ON THE MORPHOLOGY OF ELECTROSPUN THERMOPLASTIC POLYURETHANE NANOFIBRES

Abstract

The effects of solvent mixtures on the electro-spinnability of the thermoplastic polyurethane (TPU) solutions and the morphological appearance of the electrospun thermoplastic polyurethane nanofibres were investigated qualitatively by means of a scanning electron microscope (SEM). N,N-dimethylformamide (DMF), tetrahydrofuran (THF) and ethylacetate (EA) were used as solvents. TPUDMF/THF and TPU-DMF/EA solutions and the resultant nanofibres were compared to those produced by TPU-DMF system. Fibre diameters increased with the increasing THF volume fraction. At 50/50 and 40/60 DMF/THF mixtures fibres were fused to adjacent fibres and electrospinning is restricted due to low conductivity and low boiling point of the THF, and the high viscosity of the prepared solution. On the other hand, 90/10 and 80/20 DMF/EA solutions led to lower nanofibre diameters. Therefore, diluting TPU solutions with 10 or 20 % of EA had positive effect on electrospun nanofibres

Keywords

Thermoplastic polyurethane, electrospinning, nanofibres, solvents

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