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Volumn 113, Issue 45, 2009, Pages 14884-14891

Tg and rheological properties of triazine-based molecular glasses: Incriminating evidence against hydrogen bonds

Author keywords

[No Author keywords available]

Indexed keywords

FOURIER TRANSFORM INFRARED SPECTROSCOPY; GLASS; GLASS BONDING; GLASS TRANSITION; HYDROGEN; NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY; RHEOLOGY; VISCOSITY;

EID: 72449175844     PISSN: 15206106     EISSN: None     Source Type: Journal    
DOI: 10.1021/jp905268a     Document Type: Article
Times cited : (26)

References (39)
  • 4
    • 0015034365 scopus 로고
    • (a) Ozawa, T. Polymer 1971, 12, 150-158.
    • (1971) Polymer , vol.12 , pp. 150-158
    • Ozawa, T.1
  • 9
  • 14
    • 0009071257 scopus 로고
    • For example, see:(a) Angell, C. A. Science 1995, 267, 1924-1935.
    • (1995) Science , vol.267 , pp. 1924-1935
    • Angell, C.A.1
  • 28
    • 84906364767 scopus 로고    scopus 로고
    • Since we could not quantify the absolute molar fraction of N-H groups participating in hydrogen bonding in the samples, the concept of hydrogen bonding index is used herein in a qualitative fashion to describe differences in hydrogen bonding as a function of temperature
    • Since we could not quantify the absolute molar fraction of N-H groups participating in hydrogen bonding in the samples, the concept of hydrogen bonding index is used herein in a qualitative fashion to describe differences in hydrogen bonding as a function of temperature.
  • 30
    • 84906379119 scopus 로고    scopus 로고
    • This temperature was chosen because viscosity is low enough that the apparatus does not reach shear stress limit at high shear rate
    • This temperature was chosen because viscosity is low enough that the apparatus does not reach shear stress limit at high shear rate.
  • 33
    • 84906393003 scopus 로고    scopus 로고
    • The high resistance of compound 9a to crystallization under thermal conditions was already reported. See ref 11
    • The high resistance of compound 9a to crystallization under thermal conditions was already reported. See ref 11.
  • 34
    • 84906364768 scopus 로고    scopus 로고
    • Frequency scans were performed at various amplitudes, but the results did not vary significantly
    • Frequency scans were performed at various amplitudes, but the results did not vary significantly.
  • 35
    • 84906406854 scopus 로고
    • No degradation was observed in the same temperature range by DSC, possibly because the DSC measurement was taken under nitrogen atmosphere. Chlorinated polymers such as PVC are known to degrade upon heating: Fuchsman, C. H. SPE J. 1959, 15, 787-790.
    • (1959) SPE J. , vol.15 , pp. 787-790
    • Fuchsman, C.H.1
  • 36
    • 84906379116 scopus 로고    scopus 로고
    • For ease of comparison, bonded N-H vs free N-H ratios (which were calculated by comparing the heights of the respective bands) were normalized to a value of 1 for the measure taken at the lowest temperature for each data set. Thus, for every sample, the bonded N-H vs free N-H ratio for every temperature was divided by the ratio taken at the lowest temperature
    • For ease of comparison, bonded N-H vs free N-H ratios (which were calculated by comparing the heights of the respective bands) were normalized to a value of 1 for the measure taken at the lowest temperature for each data set. Thus, for every sample, the bonded N-H vs free N-H ratio for every temperature was divided by the ratio taken at the lowest temperature.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.