Molecular orientation and structure in ultrathin films of amphiphilic microgel copolymer with the branching of octadecyl groups studied by infrared spectroscopy

1997 ◽  
Vol 106 (1) ◽  
pp. 144-146
Author(s):  
B. Zhao ◽  
H. Li ◽  
X. Zhang ◽  
R. Zhang ◽  
J. Shen ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Ultrathin Films ◽  
Molecular Orientation

Real-Time Pursuit of Crystal Growth by Millisecond Time-Resolved Multichannel Fourier Transform Infrared Spectroscopy

1998 ◽  
Vol 52 (2) ◽  
pp. 222-225
Author(s):  
Mamoru Hashimoto ◽  
Hiro-O Hamaguchi
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Structural Change ◽  
Liquid Phase ◽  
Fourier Transform Infrared Spectroscopy ◽  
Molecular Orientation ◽  
Structural Changes ◽  
Fourier Transform Infrared ◽  
Time Resolved ◽  
Recovery Curves

The surface (about 130 molecular layers) of an oriented thin crystal of decanoic acid was subjected to sudden melting by a laser-induced temperature jump (T-jump), and the process of subsequent crystal re-growth was monitored by millisecond time-resolved multichannel Fourier transform infrared spectroscopy. The gauche–trans structural change of the alkane part of the molecule has been probed by the CH stretch bands in the 2800–3000 cm−1 region. The change in the molecular orientation has been detected by the OH stretch band around 3065 cm−1. The recovery curves for the CH2 antisymmetric stretch and the OH stretch bands are markedly different from each other in the first 200 ms, suggesting that the gauche–trans structural changes precedes the crystal re-growth. After 500 ms, the recovery curves become identical. This result means that the rate of the gauche to the trans structural change is equal to the rate of the recovery of the molecular orientation. It is highly likely that a fast equilibrium is attained between the gauche and the trans conformations in the liquid phase after 500 ms from the sudden melting and that the crystal re-growth takes place solely via the all-trans structure in the liquid phase.

Molecular Orientation and Relaxation of Poly(ethylene terephthalate) by Polarization Modulation Infrared Spectroscopy

2002 ◽  
Vol 35 (23) ◽  
pp. 8768-8773 ◽  
Author(s):  
Christine Duchesne ◽  
Xiaohua Kong ◽  
Josée Brisson ◽  
Michel Pézolet ◽  
Robert E. Prud'homme
Keyword(s):  
Infrared Spectroscopy ◽  
Molecular Orientation ◽  
Ethylene Terephthalate ◽  
Polarization Modulation ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene
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