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  • Articles  (3)
  • DSC
  • Springer  (3)
  • American Association for the Advancement of Science
  • American Meteorological Society
  • 1995-1999  (1)
  • 1990-1994  (2)
  • 1999  (1)
  • 1992  (2)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (3)
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  • Articles  (3)
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  • Springer  (3)
  • American Association for the Advancement of Science
  • American Meteorological Society
  • Wiley-Blackwell  (1)
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  • 1995-1999  (1)
  • 1990-1994  (2)
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  • 1
    Electronic Resource
    Electronic Resource
    Study on thermal transitions of toluene diisocyanate-based polyurethane elastomers with poly (tetramethylene oxide) as the soft segment by TSC/RMA, DSC and DMA thermal analyzers (1999)
    Springer
    Journal of polymer research 6 (1999), S. 67-78 
    Details
    ISSN: 1572-8935
    Keywords: TDI-based polyurethane elastomers ; Tg ; Tglobal transition ; DSC ; TSC/RMA ; DMA
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Thermal transitions of TDI-based polyurethane elastomers with PTMO as the soft segment were characterized by the depolarization technique in TSC and by using with the thermal windowing technique on selected specimens in the RMA measurements. Results indicate that the broadened thermal transition in the glass transition region as observed in the DSC thermogram is related to the combined Tg transition and the Tglobal transition in the TSC spectrum. This Tglobal transition is associated with the macromolecular property as detected by tan δ in DMA measurement. The increase in the Tg with a high NCO content may be explained by the structural modification found on the urethanic chain with the additional linkage of the hard segment that affects the cooperative motion of the molecular chain. Data measured from DSC, TSC/RMA and DMA with simulated DEA and wide angle X-ray data are presented for the characterization of the polyurethanes. The RMA measurement leads to a compensation search on Tg transition and provides pertinent thermokinetic data that correlates the NCO content with changes in enthalpy and entropy on the relaxation behaviors in the Tg transition of polyurethane elastomers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10965-006-0073-4
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  • 2
    Electronic Resource
    Electronic Resource
    The mechanism and stability of thermal transitions in hair keratin (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 1106-1115 
    Details
    ISSN: 1435-1536
    Keywords: Keratin ; thermal transitions ; water binding ; crystallinity ; DSC
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Differential Scanning Calorimetry (DSC) has been applied to study the interactions between components of human hair keratin. Keratin is a biopolymeric composite made of several proteins forming basically two phases: amorphous matrix and crystalline microfibrillar phase. Water, the content of which depends on atmospheric humidity, is also an integral part of keratin structure. The following processes are apparent from the DSC: removal of loosely bound water (ca. 70°C), a transition in the amorphous phase (155°C) and melting/denaturation of the α-crystalline phase (233°C). The process occurring in keratin at ca. 155°C has an opposite character to a glass transition; we refer to this process as the toughening transition. The area of the α-keratin peak increases significantly upon annealing at temperatures from 80°C to 150°C and decreases for higher annealing temperatures. Water affects both the crystalline and amorphous phases of keratin. The process similar in nature to annealing — induced recrystallization in synthetic polymers is strictly correlated with removal of strongly bound fraction of water in keratin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00652875
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  • 3
    Electronic Resource
    Electronic Resource
    Amorphous phase evolution during crystallization of poly(ethylene-terephthalate) (1992)
    Springer
    Colloid & polymer science 270 (1992), S. 1182-1187 
    Details
    ISSN: 1435-1536
    Keywords: Amorphous phase ; crystallization ; SAXS ; DSC ; PET
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Crystallization of poly(ethylene terephthalate) from the amorphous state has been studied in the temperature range 90°–120°C to characterize the amorphous phase when crystalline microstructure is developing. Small-angle x-ray scattering, scanning electron microscopy, and density measurements were used to investigate the morphology of semi-crystalline materials. Differential scanning calorimetry and dynamical mechanical spectroscopy experiments were carried out on amorphous, partially crystallized and crystallized specimens and, when structural relaxation is allowed (thermal treatments close to but below glass transition temperature), strong evidence is obtained for the existence of two different amorphous phases with different mobilities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01095058
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