Temperature dependence of the rheological properties of poly(vinylidene fluoride)/dimethyl acetamide solutions and their electrospinning

Dong Wook Chae, Min Hyung Kim, Byoung Chul Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The effects of measuring temperature on the rheological properties of poly(vinylidene fluoride) (PVDF) solutions in dimethyl acetamide (DMAc) were investigated at three different concentrations. Ubbelohde vis-cometer and rotational rheometer were employed for dilute and concentrated solution regimes, respectively. In the dilute concentration regime, intrinsic viscosity was decreased with increasing temperature over the range of 30 to 70°C but Huggins constant was increased from 0.301 to 0.345. In the high concentration regime, however, dynamic viscosity (η') was increased with increasing measuring temperature. PVDF solutions exhibited almost Newtonian flow behavior at 30°C but a notable dependence of η' on frequency was observed at 50 and 70°C. In temperature sweep measurement, the critical temperature where η' was abruptly increased was reduced with increasing PVDF concentration. Increasing measuring temperature from 30 to 70°C decreased the value of loss tangent (tan δ). The Cole-Cole plot at 30°C revealed that PVDF solutions gave a single master curve of constant slope irrespective of PVDF concentration. On the other hand, the slope varied with polymer concentration at 50 and 70°C. As the electrospinning temperature was increased the average diameter of nanofibers in the electrospun web was decreased and the fiber surface got rougher and coarser.

Original languageEnglish
Pages (from-to)229-234
Number of pages6
JournalKorea Australia Rheology Journal
Volume22
Issue number3
StatePublished - 2010 Sep 1

Fingerprint

Electrospinning
vinylidene
fluorides
temperature dependence
Temperature
temperature
viscosity
slopes
Viscosity
rheometers
Newtonian flow
tangents
Rheometers
Nanofibers
acetamide
polyvinylidene fluoride
critical temperature
plots
Polymers
fibers

Keywords

  • Dimethyl acetamide
  • Electrospinning
  • Huggins constant
  • Poly(vinylidene fluoride)
  • Rheology

Cite this

@article{a02309a5d6ad414a9a8e368c2abfd436,
title = "Temperature dependence of the rheological properties of poly(vinylidene fluoride)/dimethyl acetamide solutions and their electrospinning",
abstract = "The effects of measuring temperature on the rheological properties of poly(vinylidene fluoride) (PVDF) solutions in dimethyl acetamide (DMAc) were investigated at three different concentrations. Ubbelohde vis-cometer and rotational rheometer were employed for dilute and concentrated solution regimes, respectively. In the dilute concentration regime, intrinsic viscosity was decreased with increasing temperature over the range of 30 to 70°C but Huggins constant was increased from 0.301 to 0.345. In the high concentration regime, however, dynamic viscosity (η') was increased with increasing measuring temperature. PVDF solutions exhibited almost Newtonian flow behavior at 30°C but a notable dependence of η' on frequency was observed at 50 and 70°C. In temperature sweep measurement, the critical temperature where η' was abruptly increased was reduced with increasing PVDF concentration. Increasing measuring temperature from 30 to 70°C decreased the value of loss tangent (tan δ). The Cole-Cole plot at 30°C revealed that PVDF solutions gave a single master curve of constant slope irrespective of PVDF concentration. On the other hand, the slope varied with polymer concentration at 50 and 70°C. As the electrospinning temperature was increased the average diameter of nanofibers in the electrospun web was decreased and the fiber surface got rougher and coarser.",
keywords = "Dimethyl acetamide, Electrospinning, Huggins constant, Poly(vinylidene fluoride), Rheology",
author = "Chae, {Dong Wook} and Kim, {Min Hyung} and Kim, {Byoung Chul}",
year = "2010",
month = "9",
day = "1",
language = "English",
volume = "22",
pages = "229--234",
journal = "Korea Australia Rheology Journal",
issn = "1226-119X",
number = "3",

}

Temperature dependence of the rheological properties of poly(vinylidene fluoride)/dimethyl acetamide solutions and their electrospinning. / Chae, Dong Wook; Kim, Min Hyung; Kim, Byoung Chul.

In: Korea Australia Rheology Journal, Vol. 22, No. 3, 01.09.2010, p. 229-234.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Temperature dependence of the rheological properties of poly(vinylidene fluoride)/dimethyl acetamide solutions and their electrospinning

AU - Chae, Dong Wook

AU - Kim, Min Hyung

AU - Kim, Byoung Chul

PY - 2010/9/1

Y1 - 2010/9/1

N2 - The effects of measuring temperature on the rheological properties of poly(vinylidene fluoride) (PVDF) solutions in dimethyl acetamide (DMAc) were investigated at three different concentrations. Ubbelohde vis-cometer and rotational rheometer were employed for dilute and concentrated solution regimes, respectively. In the dilute concentration regime, intrinsic viscosity was decreased with increasing temperature over the range of 30 to 70°C but Huggins constant was increased from 0.301 to 0.345. In the high concentration regime, however, dynamic viscosity (η') was increased with increasing measuring temperature. PVDF solutions exhibited almost Newtonian flow behavior at 30°C but a notable dependence of η' on frequency was observed at 50 and 70°C. In temperature sweep measurement, the critical temperature where η' was abruptly increased was reduced with increasing PVDF concentration. Increasing measuring temperature from 30 to 70°C decreased the value of loss tangent (tan δ). The Cole-Cole plot at 30°C revealed that PVDF solutions gave a single master curve of constant slope irrespective of PVDF concentration. On the other hand, the slope varied with polymer concentration at 50 and 70°C. As the electrospinning temperature was increased the average diameter of nanofibers in the electrospun web was decreased and the fiber surface got rougher and coarser.

AB - The effects of measuring temperature on the rheological properties of poly(vinylidene fluoride) (PVDF) solutions in dimethyl acetamide (DMAc) were investigated at three different concentrations. Ubbelohde vis-cometer and rotational rheometer were employed for dilute and concentrated solution regimes, respectively. In the dilute concentration regime, intrinsic viscosity was decreased with increasing temperature over the range of 30 to 70°C but Huggins constant was increased from 0.301 to 0.345. In the high concentration regime, however, dynamic viscosity (η') was increased with increasing measuring temperature. PVDF solutions exhibited almost Newtonian flow behavior at 30°C but a notable dependence of η' on frequency was observed at 50 and 70°C. In temperature sweep measurement, the critical temperature where η' was abruptly increased was reduced with increasing PVDF concentration. Increasing measuring temperature from 30 to 70°C decreased the value of loss tangent (tan δ). The Cole-Cole plot at 30°C revealed that PVDF solutions gave a single master curve of constant slope irrespective of PVDF concentration. On the other hand, the slope varied with polymer concentration at 50 and 70°C. As the electrospinning temperature was increased the average diameter of nanofibers in the electrospun web was decreased and the fiber surface got rougher and coarser.

KW - Dimethyl acetamide

KW - Electrospinning

KW - Huggins constant

KW - Poly(vinylidene fluoride)

KW - Rheology

UR - http://www.scopus.com/inward/record.url?scp=78649762453&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:78649762453

VL - 22

SP - 229

EP - 234

JO - Korea Australia Rheology Journal

JF - Korea Australia Rheology Journal

SN - 1226-119X

IS - 3

ER -