Abstract
Iodination of syndiotacticity-rich high molecular weight poly(vinyl alcohol) (PVA) microfibril, which was obtained from the saponification of poly(vinyl pivalate) without a spinning procedure, was conducted before and after zone drawing at various conditions. The resulting PVA microfibrils were characterized by differential scanning calorimetry and scanning electron microscopy. Surface morphologies of these PVA microfibrils showed some differences between PVA microfibrils iodinated after and before drawing. Crude shapes of PVA microfibrils iodinated after drawing indicated that iodine decreased the structural regularity severely. On the other hand, PVA microfibrils iodinated before drawing showed relatively ordered surfaces. This was ascribed to the enhanced molecular ordering of PVA microfibrils due to zone drawing. Iodinated PVA microfibrils showed a decrease in the crystal melting temperature of about 100°C compared to the untreated sample. PVA microfibrils drawn after iodination showed a relatively higher crystal melting temperature than those of microfibrils iodinated after drawing. These results were considered as proof of the changes in the crystalline lattice of the PVA microfibrils by iodine absorption. Effects of the drawing temperature on the sublimation of iodine were also evaluated.
| Original language | English |
|---|---|
| Pages (from-to) | 1519-1524 |
| Number of pages | 6 |
| Journal | Journal of Applied Polymer Science |
| Volume | 87 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2003 Feb 28 |
| Externally published | Yes |
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Keywords
- Iodination
- PVA microfibril
- Zone drawing
ASJC Scopus subject areas
- Polymers and Plastics
Cite this
Effect of iodine absorption on the characteristics of syndiotacticity-rich high molecular weight poly(vinyl alcohol) microfibril. / Ghim, Han Do; Kim, Jae Pil; Kwon, Ick Chan; Lee, Chul Joo; Lee, Jinwon; Kim, Sam Soo; Lee, Sung Min; Yoon, Won Sik; Lyoo, Won Seok.
In: Journal of Applied Polymer Science, Vol. 87, No. 9, 28.02.2003, p. 1519-1524.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of iodine absorption on the characteristics of syndiotacticity-rich high molecular weight poly(vinyl alcohol) microfibril
AU - Ghim, Han Do
AU - Kim, Jae Pil
AU - Kwon, Ick Chan
AU - Lee, Chul Joo
AU - Lee, Jinwon
AU - Kim, Sam Soo
AU - Lee, Sung Min
AU - Yoon, Won Sik
AU - Lyoo, Won Seok
PY - 2003/2/28
Y1 - 2003/2/28
N2 - Iodination of syndiotacticity-rich high molecular weight poly(vinyl alcohol) (PVA) microfibril, which was obtained from the saponification of poly(vinyl pivalate) without a spinning procedure, was conducted before and after zone drawing at various conditions. The resulting PVA microfibrils were characterized by differential scanning calorimetry and scanning electron microscopy. Surface morphologies of these PVA microfibrils showed some differences between PVA microfibrils iodinated after and before drawing. Crude shapes of PVA microfibrils iodinated after drawing indicated that iodine decreased the structural regularity severely. On the other hand, PVA microfibrils iodinated before drawing showed relatively ordered surfaces. This was ascribed to the enhanced molecular ordering of PVA microfibrils due to zone drawing. Iodinated PVA microfibrils showed a decrease in the crystal melting temperature of about 100°C compared to the untreated sample. PVA microfibrils drawn after iodination showed a relatively higher crystal melting temperature than those of microfibrils iodinated after drawing. These results were considered as proof of the changes in the crystalline lattice of the PVA microfibrils by iodine absorption. Effects of the drawing temperature on the sublimation of iodine were also evaluated.
AB - Iodination of syndiotacticity-rich high molecular weight poly(vinyl alcohol) (PVA) microfibril, which was obtained from the saponification of poly(vinyl pivalate) without a spinning procedure, was conducted before and after zone drawing at various conditions. The resulting PVA microfibrils were characterized by differential scanning calorimetry and scanning electron microscopy. Surface morphologies of these PVA microfibrils showed some differences between PVA microfibrils iodinated after and before drawing. Crude shapes of PVA microfibrils iodinated after drawing indicated that iodine decreased the structural regularity severely. On the other hand, PVA microfibrils iodinated before drawing showed relatively ordered surfaces. This was ascribed to the enhanced molecular ordering of PVA microfibrils due to zone drawing. Iodinated PVA microfibrils showed a decrease in the crystal melting temperature of about 100°C compared to the untreated sample. PVA microfibrils drawn after iodination showed a relatively higher crystal melting temperature than those of microfibrils iodinated after drawing. These results were considered as proof of the changes in the crystalline lattice of the PVA microfibrils by iodine absorption. Effects of the drawing temperature on the sublimation of iodine were also evaluated.
KW - Iodination
KW - PVA microfibril
KW - Zone drawing
UR - http://www.scopus.com/inward/record.url?scp=0037469826&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0037469826&partnerID=8YFLogxK
U2 - 10.1002/app.11551
DO - 10.1002/app.11551
M3 - Article
VL - 87
SP - 1519
EP - 1524
JO - Journal of Applied Polymer Science
JF - Journal of Applied Polymer Science
SN - 0021-8995
IS - 9
ER -