### Abstract

Transient shear stresses in linear polystyrene solutions after stepwise change of shear rate from a steady shear rate _{*} _{1}to a higher or a lower values of _{*} _{2} were observed using a Weissenberg rheogoniometer type R-17. The initial parts of stress development curves after stepwise increase of shear rate from constant _{*} _{2}to different *i compose a single line independent of *_{2}. The initial parts of stress relaxation curves relative to the first steady state also compose a single line independent of _{*} _{2}if _{*} _{1}is kept constant. It was concluded that the original quasi-network structure of polymer solutions have a stability and in the case of stepwise increase of shear rate the original structure is ruptured when a certain critical strain is accumulated in the solution. It was also concluded that the initial slopes become lower with increasing *_{u}reflecting decrease of the effective entanglement density with increasing _{*} _{1}.

Original language | English |
---|---|

Pages (from-to) | 132-135 |

Number of pages | 4 |

Journal | Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan) |

Volume | 14 |

Issue number | 3 |

DOIs | |

Publication status | Published - Jan 1 1986 |

Externally published | Yes |

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### All Science Journal Classification (ASJC) codes

- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering

### Cite this

*Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)*,

*14*(3), 132-135. https://doi.org/10.1678/rheology1973.14.3_132

**Transient Viscosity of Polymer Solutions after Stepwise Change of Shear Rates.** / Takahashi, Yoshiaki; Noda, Ichiro; Nagasawa, Mitsuru; Isom, Yoshinobu.

Research output: Contribution to journal › Article

*Nihon Reoroji Gakkaishi(Journal of the Society of Rheology, Japan)*, vol. 14, no. 3, pp. 132-135. https://doi.org/10.1678/rheology1973.14.3_132

}

TY - JOUR

T1 - Transient Viscosity of Polymer Solutions after Stepwise Change of Shear Rates

AU - Takahashi, Yoshiaki

AU - Noda, Ichiro

AU - Nagasawa, Mitsuru

AU - Isom, Yoshinobu

PY - 1986/1/1

Y1 - 1986/1/1

N2 - Transient shear stresses in linear polystyrene solutions after stepwise change of shear rate from a steady shear rate * 1to a higher or a lower values of * 2 were observed using a Weissenberg rheogoniometer type R-17. The initial parts of stress development curves after stepwise increase of shear rate from constant * 2to different *i compose a single line independent of *2. The initial parts of stress relaxation curves relative to the first steady state also compose a single line independent of * 2if * 1is kept constant. It was concluded that the original quasi-network structure of polymer solutions have a stability and in the case of stepwise increase of shear rate the original structure is ruptured when a certain critical strain is accumulated in the solution. It was also concluded that the initial slopes become lower with increasing *ureflecting decrease of the effective entanglement density with increasing * 1.

AB - Transient shear stresses in linear polystyrene solutions after stepwise change of shear rate from a steady shear rate * 1to a higher or a lower values of * 2 were observed using a Weissenberg rheogoniometer type R-17. The initial parts of stress development curves after stepwise increase of shear rate from constant * 2to different *i compose a single line independent of *2. The initial parts of stress relaxation curves relative to the first steady state also compose a single line independent of * 2if * 1is kept constant. It was concluded that the original quasi-network structure of polymer solutions have a stability and in the case of stepwise increase of shear rate the original structure is ruptured when a certain critical strain is accumulated in the solution. It was also concluded that the initial slopes become lower with increasing *ureflecting decrease of the effective entanglement density with increasing * 1.

UR - http://www.scopus.com/inward/record.url?scp=85007666157&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85007666157&partnerID=8YFLogxK

U2 - 10.1678/rheology1973.14.3_132

DO - 10.1678/rheology1973.14.3_132

M3 - Article

AN - SCOPUS:85007666157

VL - 14

SP - 132

EP - 135

JO - Nihon Reoroji Gakkaishi

JF - Nihon Reoroji Gakkaishi

SN - 0387-1533

IS - 3

ER -