Transient conformational change of bead-spring ring chain during creep process

Macromolecules

Volumn 39, Issue 16, 2006, Pages 5419-5426

  Watanabe, Hiroshi ^a   Inoue, Tadashi ^a   Matsumiya, Yumi ^a  

^a KYOTO UNIVERSITY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

ANISOTROPY; MOLECULAR STRUCTURE; SEPARATION; STEADY FLOW; STRESSES;

BEAD-SPRING MODEL; LINEAR CHAIN; ORIENTATIONAL ANISOTROPY;

POLYMERS;

EID: 33748303146     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma0608471     Document Type: Article

References (25)

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17. 2(n - n′){1 - (n - n)/N}.
18. BT.
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22. o(t) seen in Figure 2 is contributed from time-dependent changes in both of the orientational correlation of different segments and the orientational anisotropy of respective segments.
23. The difference in the orientational correlation of the segments of the ring and linear chains is not limited to the stress-controlled creep process but also observed for the start-up process of constant rate flow. In both processes, positive and negative correlations grow for the ring segments with An Δn ≅ and N/2 while the positive correlation grows for all segments of the linear chain.
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25. η ≅ 1/2 and appear to be described by the bead-spring model. No rigid explanation seems to have been given for this difference between PDMS and PS. Apart from this problem, we note that the viscoelastic properties just correspond to the orientational anisotropy averaged over all segments, and thus, the details of the bead-spring model (motion of respective segments) have not been verified even for the ring and linear PS. It is important to test the model through a rheooptical experiment for partially labeled chains, (b) Cosgrove, T.; Griffiths, P. C.; Hollingshurst, J.; Richards, R. D. C.; Semlyen, J. A. Macromolecules 1992, 25, 6761.