Transient viscoelastic properties of lamellae-forming diblock copolymers with flow-induced alignment

Yoshiaki Takahashi, Kenta Imaichi, Masahiro Noda, Atsushi Takano, Yushu Matsushita

Research output: Contribution to journalArticle

Abstract

The transient viscoelastic properties of lamellae-forming poly(styrene-block-2-vinylpyridine) and poly(styrene-d8-block-2-vinylpyridine) were measured to examine the alignment process of lamellae. Rescaled transient stress σ(t) after step increase of shear rate could not be scaled by strain or time, and the data showed poor reproducibility. σ(t) upon the onset of flow after a given rest time showed relatively large overshoot, while it instantaneously became steady upon the reverse of flow. These results suggest that the average degree of alignment is the same at the steady states, but the transient stresses are determined by the size and number of grains that undergo alignment.

Original languageEnglish
Pages (from-to)437-440
Number of pages4
JournalKOBUNSHI RONBUNSHU
Volume64
Issue number7
DOIs
Publication statusPublished - Jul 1 2007

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All Science Journal Classification (ASJC) codes

  • Chemical Engineering (miscellaneous)
  • Materials Science (miscellaneous)
  • Environmental Science(all)
  • Polymers and Plastics

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