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Volumn 38, Issue 5, 2005, Pages 1767-1778

Impacts of polystyrene molecular weight and modification to the repeat unit structure on the glass transition-nanoconfinement effect and the cooperativity length scale

Author keywords

[No Author keywords available]

Indexed keywords

ASYMETRIC MEMBRANES; DISK DRIVE LUBRICANTS; NANOCONFINEMENT EFFECTS; REPEAT UNIT STRUCTURES; X-RAY REFLECTIVITY;

EID: 15344343482     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma047846y     Document Type: Article
Times cited : (294)

References (95)
  • 42
    • 0028424882 scopus 로고
    • and references therein
    • Mayes, A. M. Macromolecules 1994, 27, 3114-3115 and references therein.
    • (1994) Macromolecules , vol.27 , pp. 3114-3115
    • Mayes, A.M.1
  • 43
    • 15344339965 scopus 로고    scopus 로고
    • note
    • g, bulk.
  • 49
  • 68
    • 15344341369 scopus 로고    scopus 로고
    • note
    • The overall chain conformation is likely substantially altered in nanoconfined films, adopting, on average, an ellipsoidal conformation with a large aspect ratio as opposed to the random coil expected in bulk.
  • 69
    • 15344349484 scopus 로고    scopus 로고
    • note
    • 21
  • 78
    • 15344345887 scopus 로고    scopus 로고
    • note
    • It should be noted that Donth's method has been described in the literature (see ref 56) as being controversial as it theoretical basis has not been verified.
  • 79
    • 15344350030 scopus 로고    scopus 로고
    • note
    • CRR value of ∼3.5 nm for PS and that measured by Donth of ∼3.0 nm.
  • 80
    • 15344346811 scopus 로고    scopus 로고
    • note
    • Given the assumptions employed in Donth's method (see ref 79), the associated error significantly exceeds ±0.1 nm.
  • 82
    • 15344351027 scopus 로고
    • Doctoral Dissertation, Mainz University, Germany
    • Stickel, F. Doctoral Dissertation, Mainz University, Germany, 1995.
    • (1995)
    • Stickel, F.1
  • 84
    • 15344343249 scopus 로고    scopus 로고
    • note
    • CRR values for glycerol obtained by Donth (which are consistent with our data) and those obtained using 4D NMR. However, that discussion invokes the use of a temperature dependence for the size scale or number of units in a cooperatively rearranging region that is different from that mentioned in our paper.
  • 85
    • 0000917845 scopus 로고    scopus 로고
    • note
    • g, we had a couple of reasons for believing that it was important to perform our own investigation of this issue. First, we needed to establish credibility for our experiments, which also included the effects of diluent addition to PS and modification of repeat unit structure. Second, ref 49 has been virtually forgotten in the research literature, even by Donth himself, who has not cited this reference in his later studies. This led to some concern on our part regarding the reference; those concerns were allayed by our measurements. (It should be noted that the results in ref 49 are from analysis of measurements published in: Krause, S.; Iskander, M.; Iqbal, M. Macromolecules 1982, 15, 105-111).
  • 86
    • 15344343250 scopus 로고    scopus 로고
    • note
    • CRR obtained from our experimental studies are calculated without employing Donth's correction factor, S (see ref 79).
  • 94
    • 15344345004 scopus 로고    scopus 로고
    • note
    • CRR assumed that all units were PS repeat units.
  • 95
    • 15344341904 scopus 로고    scopus 로고
    • note
    • CRR to be approximately the same in the two polymers, the value of the S parameter for PTBS would need to be about 4 times that of PS.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.