A device-quality thermosetting polyurethane with improved processability and high thermal stability of dipole alignment for electro-optic applications

2006 ◽  
Vol 66 (8) ◽  
pp. 832-839 ◽  
Author(s):  
Jumin Hao ◽  
Mei-Juan Han ◽  
Yanfang Yang ◽  
Yuquan Shen ◽  
Ling Qiu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
High Thermal Stability ◽  
Electro Optic ◽  
Thermal Stability Of ◽  
Dipole Alignment

SYNTHESIS OF NOVEL Y-TYPE POLYURETHANES WITH HIGH THERMAL STABILITY OF DIPOLE ALIGNMENT AND THEIR ELECTRO-OPTIC PROPERTIES

2005 ◽  
Vol 14 (03) ◽  
pp. 341-355 ◽  
Author(s):  
JU-YEON LEE ◽  
WON-TAEK JUNG ◽  
BUM KU RHEE
Keyword(s):  
Thermal Stability ◽  
Main Chain ◽  
High Thermal Stability ◽  
Scanning Calorimetry ◽  
Electro Optic ◽  
Chain Character ◽  
Device Applications ◽  
Nlo Chromophores ◽  
Thermal Stability Of ◽  
Dipole Alignment

3,4-di-(2′-hydroxyethoxy)benzylidenemalononitrile (3) was prepared and condensed with 2,4-toluenediisocyanate, 1,6-hexamethylenediisocyanate and 3,3′-dimethoxy-4,4′-biphenylenediisocyanate to yield novel Y-type polyurethanes (4-6) containing 3,4-dioxybenzylidenemalononitrile groups as nonlinear optical (NLO) chromophores, which are parts of the polymer backbones. The resulting polyurethanes 4-6 were soluble in common organic solvents such as acetone and DMSO. Polymers 4-6 exhibited a thermal stability up to 260°C from thermogravimetric analysis (TGA) with differential scanning calorimetry (DSC) with T g values in the range of 96–152°C. The SHG coefficients (d33) of poled polymer films were around 6.8 × 10-9 esu. These poled polymers exhibited a high thermal stability of dipole alignment even at 20°C higher than T g , and no SHG decay was observed below 175°C due to the partial main chain character of the polymer structure, which is acceptable for NLO device applications.

Synthesis and nonlinear optical properties of novel polyurethanes with high thermal stability of dipole alignment

2004 ◽  
Vol 144 (2) ◽  
pp. 159-167 ◽  
Author(s):  
Ju-Yeon Lee ◽  
Han-Bae Bang ◽  
Eun-Ju Park ◽  
Chang Suk Baek ◽  
Bum Ku Rhee ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
High Thermal Stability ◽  
Nonlinear Optical Properties ◽  
Thermal Stability Of ◽  
Dipole Alignment
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