Abstract
The effects of tacticities on the characteristics of polyvinyl alcohol) (PVA) nanowebs prepared by an electrospinning technique were investigated. PVA webs composed of uniform nanofibers with syndiotactic dyad (s-dyad) contents of 53.5 and 57.3% were successfully obtained with electrospinning. By changing processing parameters such as the initial polymer concentration, applied voltage, and tip-to-collector distance, we found suitable conditions for forming PVA webs with uniform nanofibers. PVAs of higher s-dyad contents were prepared at a lower solution concentration and at a higher applied voltage because of the easy formation of syndiotactic PVA chain entanglements at a very low polymer concentration. The average diameter of the nanofibers in a PVA web with the higher s-dyad content of 57.3% (ca. 240 nm) was thinner than that of the nanofibers in a PVA web with the lower s-dyad content of 53.5% (ca. 270 nm). In addition, the crystallinity and thermal stability were greatly increased with an increase in the s-dyad content.
Original language | English |
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Pages (from-to) | 3282-3289 |
Number of pages | 8 |
Journal | Journal of Applied Polymer Science |
Volume | 106 |
Issue number | 5 |
DOIs | |
State | Published - 5 Dec 2007 |
Keywords
- Electrospinning
- Morphology
- Poly(vinyl alcohol)