Structure/property relationships in nematic liquid crystal/polymer alignment layer interactions

2000 ◽  
Vol 521 (1-3) ◽  
pp. 121-126 ◽  
Author(s):  
C.M Snively ◽  
J.L Koenig
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Structure Property ◽  
Alignment Layer ◽  
Structure Property Relationships ◽  
Crystal Polymer ◽  
Polymer Alignment

Dispersions of Diamond Nanoparticles in Nematic Liquid Crystal/Polymer Materials

2011 ◽  
Vol 545 (1) ◽  
pp. 77/[1301]-84/[1308] ◽  
Author(s):  
M. Elouali ◽  
C. Beyens ◽  
F. Z. Elouali ◽  
O. Yaroshchuk ◽  
B. Abbar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Liquid Crystal Polymer ◽  
Polymer Materials ◽  
Diamond Nanoparticles ◽  
Crystal Polymer

Photoresponsive Azobenzene Liquid Crystal Polymer Networks: In Situ Photogenerated Stress Measurement

2010 ◽  
Author(s):  
Yanira Torres ◽  
Timothy White ◽  
Amber McClung ◽  
William Oates
Keyword(s):  
Liquid Crystal ◽  
Stress Measurement ◽  
Polymer Network ◽  
Polymer Networks ◽  
Liquid Crystal Polymer ◽  
Polymerization Process ◽  
Polarization Angle ◽  
Structure Property ◽  
Crystal Polymer ◽  
Azobenzene Mesogens

Azobenzene liquid crystal polymers and polymer networks are adaptive materials capable of converting light into mechanical work. Often, the photomechanical output of the azobenzene liquid crystal network (azo-LCN) is observed as a bending cantilever. The response of these materials can be either static (e.g. a simple bending cantilever) or dynamic (e.g. oscillating cantilever of 20–270 Hz). The resulting photomechanical output is dependent upon the domain orientation of the polymer network and the wavelength and polarization of the actinic light. Polydomain azobenzene liquid crystal polymer networks, which have the capability of bending both backwards and forwards with the change of polarization angle, are of particular interest. In the current study, three azo-LCNs are compared — two of them are equivalent in all respects except for one contains pendant azobenzene mesogens (1azo, azo-monoacrylate) and the other contains crosslinked azobenzene mesogens (2azo, azo-diacrylate). The third specimen has a combination of both mesogens. The mechanical behavior at different temperatures and examination of structure-property relationships in the polymerization process, including curing temperatures and liquid crystal cell alignment rubbing methods, were explored. Using dynamic mechanical analysis (DMA) the mechanical properties and the photogenerated stress and strain in the polymer are examined. It is found the differences in chemistry do correlate to small variation in the speed of photodirected bending, elastic modulus, and glass transition temperature. Despite these differences, all three azo-LCNs display nearly equivalent photogenerated stresses.

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