Melting Behavior of Epitaxially Crystallized Polycarprolactone on a Highly Oriented Polyethylene Thin Film Investigated byin SituSynchrotron SAXS and Polarized Infrared Spectroscopy

2010 ◽  
Vol 43 (12) ◽  
pp. 5315-5322 ◽  
Author(s):  
Yongxin Duan ◽  
Jianming Zhang ◽  
Haibo Chang ◽  
Shouke Yan ◽  
Chunming Yang ◽  
...  
Keyword(s):  
Thin Film ◽  
Infrared Spectroscopy ◽  
Melting Behavior ◽  
Polarized Infrared Spectroscopy ◽  
Oriented Polyethylene

Spontaneous polarization parallel to the tilt plane in the antiferroelectric chiral smectic-CAphase of liquid crystals as observed by polarized infrared spectroscopy

1995 ◽  
Vol 52 (3) ◽  
pp. R2153-R2156 ◽  
Author(s):  
Kouichi Miyachi ◽  
Jin Matsushima ◽  
Yoichi Takanishi ◽  
Ken Ishikawa ◽  
Hideo Takezoe ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Liquid Crystals ◽  
Spontaneous Polarization ◽  
Polarized Infrared Spectroscopy

Evolution of the structural orientation in polyacrylonitrile precursors during stabilization revealed by in-situ synchrotron wide-angle X-ray diffraction and polarized infrared spectroscopy

2016 ◽  
Vol 29 (10) ◽  
pp. 1158-1164 ◽  
Author(s):  
Yiran Zhou ◽  
Xu Han ◽  
Xiaoyuan Hu ◽  
Lianghua Xu ◽  
Weiyu Cao
Keyword(s):  
Infrared Spectroscopy ◽  
Thermal Relaxation ◽  
Thermal Stabilization ◽  
Orientation Factor ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
Temperature Dependent ◽  
X Ray ◽  
Polarized Infrared Spectroscopy

Evolution of the orientation structures of polyacrylonitrile (PAN) precursors during thermal stabilization was investigated on the basis of in situ temperature-dependent measurements including synchrotron wide-angle X-ray diffraction and polarized infrared spectroscopy. The results indicated that the Hermans orientation factor of PAN crystallites increased firstly and then decreased in the process of stabilization, while the orientation of molecular chains showed a two-stage decrease. These were mainly attributed to the thermal relaxation of molecular chains and the cyclization reactions, which also resulted in the physical shrinkage as well as the chemical shrinkage apparently observed from the thermal mechanical curves of the precursor.

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