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| 발행년도/권호 |
2010 년 / 권호: V.22,no.3,Sept |
| 논문제목1(원어) |
Rheological Measurement of Fiber Spinnability of PVA Solution Dopes in DMSO |
| 논문제목2(타언어) |
Rheological Measurement of Fiber Spinnability of PVA Solution Dopes in DMSO |
| 저자(원어) |
Dong Wook Chae |
| 저자(타언어) |
Dong Wook Chae |
| 소속(원어) |
Kyungpook National University |
| 소속(타언어) |
Kyungpook National University |
| 시작/끝
페이지 |
187 ~ 193 총페이지 : 7 |
| 언어(원어) |
English |
| 초록 |
Abstract― The effects of molecular weight (MW) and concentration on the rheological properties of poly(vinyl alcohol)
(PVA) solutions in dimethyl sulfoxide (DMSO) were investigated at 30 oC. Ubbelohde viscometer and rotational rheometer
were employed for dilute and concentrated regime, respectively. In the dilute regime, the Mark-Houwink exponent (α) of the
solutions determined from three different MWs proved 0.73. The critical concentration (C*), in which the entanglement and
overlap of polymer molecules began to take place, decreased with increasing the MW of PVA. Huggins constant (KH) values
ranged from 0.33 to 0.45 over the MW examined. In the log-log plot of ηsp versus [η]C, the PVA with higher degree of
polymerization (DP) gave a greater slope exhibiting the inflection point in the vicinity of C*. In the dynamic viscosity (η\')
curve, the PVA solutions of DP 1700 presented Newtonian fluid behavior over most of the frequency range examined.
However, the lower Newtonian flow region reduced with increasing the DP. As the PVA concentration increased, η\' was
increased and the onset shear rate for pseudoplasticity was decreased. In the Cole-Cole plot, PVA solutions showed almost a
single master curve in a slope of ca. 1.65 regardless of the DP. However, the increase of the concentration from 8 to 12 wt%
for PVA solutions of DP 5000 decreased the slope from 1.73 to 1.57. In the tan δ curve, the onset frequency for sol-gel
transition was shifted from 154 to 92 rad/s with increasing the DP from 3300 to 5000 and from 192 to 46 rad/s with
increasing the concentration from 8 to 12 wt%. In addition, longer relaxation time (λ) was observed with increasing the DP
and concentration. |
| 키워드 |
Keywords: poly(vinyl alcohol) (PVA), dimethyl sulfoxide (DMSO), Mark-Houwink equation, dynamic viscosity,
Cole-Cole plot, tanδ |
| 학회지 |
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| Reference |
http://www.koreascience.or.kr/article/ArticleFullRecord.jsp?cn=OSGGBT_2010_v22n3_187 |
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