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Volumn 109, Issue 37, 2005, Pages 17654-17669

Whole range of chain dynamics in entangled polystyrene melts revealed from creep compliance: Thermorheological complexity between glassy-relaxation region and rubber-to-fluid region. 1

Author keywords

[No Author keywords available]

Indexed keywords

CALORIMETRY; CHEMICAL RELAXATION; DIFFUSION; ENTROPY; FRICTION; GLASS; GLASS TRANSITION; MELTING; MOLECULAR WEIGHT; RHEOLOGY; RUBBER; VISCOSITY;

EID: 25844481601     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp040568k     Document Type: Article
Times cited : (10)

References (98)
  • 10
    • 25844509828 scopus 로고    scopus 로고
    • note
    • A(t) process obtained from the G(t) line-shape analysis (i.e., eq 8) has been used when the J(t) line-shape analysis over the whole range is being made, whose results are shown in Figures 1 and 2.
  • 24
    • 25844518975 scopus 로고    scopus 로고
    • note
    • Note: The polydispersity of the sample, even though nearly monodisperse, has an effect on the detailed line shape of J(t) in the rubber-like-to-fluid region. This effect, as can be easily accounted for by convolution with the Schulz distribution, virtually does not affect the obtained K value. See section 3.4.
  • 30
    • 25844492411 scopus 로고    scopus 로고
    • note
    • p) are proportional to K′, which is in turn proportional to K through eq 8.
  • 32
    • 0004039387 scopus 로고
    • Cantow, M. J. R., Ed.; Academic: New York
    • Tung, L. H. Polymer Fractionation; Cantow, M. J. R., Ed.; Academic: New York, 1967.
    • (1967) Polymer Fractionation
    • Tung, L.H.1
  • 33
    • 25844500797 scopus 로고    scopus 로고
    • note
    • The uncertainty ±0.4 in temperature is estimated from the standard deviation of K as shown in Table 1 and the temperature dependence of viscosity as given in ref 29; this uncertainty is an overestimate as the standard deviation of K includes the errors in molecular weight of the samples.
  • 35
    • 25844515598 scopus 로고    scopus 로고
    • note
    • In the visual superposition to obtain a good fit, both the calculated and measured curves are first displayed in separate figures using the same scales. The figures are stored in a graphic software (CorelDRAW), which allows the superposition to be done under a large magnification on a monitor and at the same time allows the data points being plotted onto the calculated curve. The finished figures can be adjusted to any suitable size. In this procedure, logical steps can be followed to ensure that the comparison between the theory and experiments is accurate.
  • 37
    • 25844434678 scopus 로고    scopus 로고
    • note
    • S of sample A as defined in ref 31 (i.e., equivalent to the temperature dependence of the product of K and s) and that of J(t) in the recoverable region determined by Plazek through data reduction, as shown in Figure 5 of ref 31. The agreement in temperature dependence between the obtained K values and the viscosity results of Plazek is also shown in the same figure. These agreements support the consistency between the composition of the J(t) curves measured at different temperatures as shown in Figure 1 and that shown in Figure 2 of ref 19; the former is guided by the fittings to eqs 1, 4, and 5, while the latter was done through the data reduction by Plazek.
  • 42
    • 25844452678 scopus 로고    scopus 로고
    • note
    • e, which can be regarded as a solvent as far as entanglement is concerned. The details can be found in refs 4 and 5.
  • 44
    • 0009071257 scopus 로고
    • and references therein
    • Angell, C. A. Science 1995, 267, 1924 and references therein.
    • (1995) Science , vol.267 , pp. 1924
    • Angell, C.A.1
  • 46
    • 25844463601 scopus 로고    scopus 로고
    • note
    • g value, the value of sample A should be close to 97 °C, while that of sample B should be around 98.5 °C. (see refs 42 and 43).
  • 48
    • 0025664698 scopus 로고
    • and unpublished results
    • Lin, Y.-H. Macromolecules 1990, 23, 5292 and unpublished results.
    • (1990) Macromolecules , vol.23 , pp. 5292
    • Lin, Y.-H.1
  • 50
    • 25844530082 scopus 로고    scopus 로고
    • note
    • Note: One may also calculate the shift Δ log t using eq 3 of ref 44.
  • 59
  • 64
    • 25844480552 scopus 로고    scopus 로고
    • note
    • g. In the case of sample A, whose molecular weight is not that low, the effect causes at most a shift of 20% along the time coordinate in the fluid region. Besides, the shift is accounted for in determining the K value as shown by the close fitting between the calculated and measured curves. Thus, any error that can arise is really very small.
  • 77
    • 0346571801 scopus 로고
    • and references therein
    • Mountain, R. D. J. Chem. Phys. 1995, 102, 5408 and references therein.
    • (1995) J. Chem. Phys. , vol.102 , pp. 5408
    • Mountain, R.D.1
  • 95
    • 25844458183 scopus 로고    scopus 로고
    • note
    • n of the sample has gone significantly beyond 1.1. See refs 5 and 88 for details.
  • 98
    • 25844530742 scopus 로고    scopus 로고
    • See page 182 of ref 5
    • See page 182 of ref 5.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.