Infra-red spectroscopic characterization of the α → β phase transition in poly(tetramethylene terephthalate)

Polymer ◽  
1985 ◽  
Vol 26 (2) ◽  
pp. 235-240 ◽  
Author(s):  
P.C. Gillette ◽  
J.B. Lando ◽  
J.L. Koenig
Keyword(s):  
Phase Transition ◽  
Spectroscopic Characterization ◽  
Β Phase ◽  
Infra Red

Spectroscopic Characterization of the α⇌β Crystalline Phase Transition in Poly(Butylene Terephthalate) and its Copolymers with Poly(Tetramethylene Oxide).

1986 ◽  
Vol 79 ◽  
Author(s):  
Eva Dobrovolny-Marand ◽  
Shaw Ling Hsu
Keyword(s):  
Phase Transition ◽  
Volume Ratio ◽  
Spectroscopic Characterization ◽  
Intramolecular Interactions ◽  
Butylene Terephthalate ◽  
Β Phase ◽  
The Mean ◽  
Hard Segments ◽  
Tetramethylene Oxide

AbstractThe stress-induced crystalline α⇌β phase transition found in poly(butylene terephthalate) and its copolymers with poly(tetramethylene oxide) has been studied by Fourier transform infrared spectroscopy coupled with mechanical measurements. The phase transformation behavior was explained in terms of a cooperative model which considered both intermolecular as well as intramolecular interactions within the crystal. It was shown that the strength of the intramolecular interactions increased with length of the hard segments and that the strength of the intermolecular interactions increased with perfection and lateral size of the crystals. The intermolecular interaction was assumed to be dominated by the interaction between neighboring terephthalate groups. The “mean” intramolecular energy was estimated at 0.40 Kcal/mole. This calculation was based on the potential energy of rotations of a carbonyl group about a benzene-carbonyl bond. Cooperativity between chains diminished when the surface to volume ratio increased above 2 x 10-2 Å-1.

Infra-red spectroscopic characterization of surface coatings on glass fibres

1981 ◽  
Vol 16 (11) ◽  
pp. 3211-3214 ◽  
Author(s):  
A. Garton ◽  
A. Stolow ◽  
D. M. Wiles
Keyword(s):  
Spectroscopic Characterization ◽  
Surface Coatings ◽  
Glass Fibres ◽  
Infra Red

Characterization of the α−β Phase Transition in Friedels Salt (Ca2Al(OH)6Cl·2H2O) by Variable-Temperature27Al MAS NMR Spectroscopy

2002 ◽  
Vol 106 (28) ◽  
pp. 6676-6682 ◽  
Author(s):  
Morten Daugaard Andersen ◽  
Hans J. Jakobsen ◽  
Jørgen Skibsted
Keyword(s):  
Phase Transition ◽  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
Β Phase

Microstructural and Microchemical Characterization of Nickel Sulfide Inclusions in Plate Glass

1991 ◽  
Vol 49 ◽  
pp. 962-963
Author(s):  
J. Cooper ◽  
O. Popoola ◽  
W. M. Kriven
Keyword(s):  
Thermal Expansion ◽  
Phase Transformation ◽  
Glass Matrix ◽  
Nickel Sulfide ◽  
Plate Glass ◽  
Thermal Expansion Mismatch ◽  
Volume Increase ◽  
Β Phase ◽  
Microchemical Characterization

Nickel sulfide inclusions have been implicated in the spontaneous fracture of large windows of tempered plate glass. Two alternative explanations for the fracture-initiating behaviour of these inclusions have been proposed: (1) the volume increase which accompanies the α to β phase transformation in stoichiometric NiS, and (2) the thermal expansion mismatch between the nickel sulfide phases and the glass matrix. The microstructure and microchemistry of the small inclusions (80 to 250 μm spheres), needed to determine the cause of fracture, have not been well characterized hitherto. The aim of this communication is to report a detailed TEM and EDS study of the inclusions.

Spectroscopic Characterization of Bacteriorhodopsin's L-intermediate in 3D Crystals Cooled to 170 K¶

2001 ◽  
Vol 74 (6) ◽  
pp. 794 ◽  
Author(s):  
Antoine Royant ◽  
Karl Edman ◽  
Thomas Ursby ◽  
Eva Pebay-Peyroula ◽  
Ehud. M. Landau ◽  
...  
Keyword(s):  
Spectroscopic Characterization
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