Rheology of liquid crystalline polymers

Synthesis and Properties of Thermotropic Copolyesters Based on Poly(ethylene terephthalate) and 4′-Acetoxy-4-biphenyl-carboxylic Acid

“…(3) sharply non-Newtonian behavior due to fragmentation and reorientation of the LC phase domains [39,40]. In our case, only zones 2 and 3 were observed for copolyesters C60 and C80 (Figure 7a), which can be explained by insufficiently long conditioning of the melts at the measurement temperature in order to avoid thermal oxidative processes.…”

A review of the second normal-stress difference; its importance in various flows, measurement techniques, results for various complex fluids and theoretical predictions

“…Liquid crystals may flow in a fluid-like manner, but also have the molecular alignment characteristics of a solid crystal and interesting optical properties. They consist of rod-like polymer solutions which align in parallel and exhibit crystallinity (Głowińska, Parcheta, and Datta, 2019;Wissbrun, 1981). These fluids can be isotropic solutions and their behaviour is broadly consistent with concentrated polymer solutions and − N = 0.29 ± 0.01 (Baek, Magda, N and Larson, 1993;Hongladarom and Burghardt, 1993;.…”

Surface-induced interaction of colloidal particles in isotropic liquid crystals

“…The elastic deformations induced by colloidal particles in their neighborhoods extend over distances, influencing the stability of structures formed within the liquid crystal medium [20][21][22][23]. Moreover, boundary conditions play a crucial role in determining how colloidal particles respond to external fields, such as electric or magnetic fields, and can modulate the rheological properties of the system [6,[13][14][15]24]. Researchers frequently leverage specific boundary conditions to engineer desired structures and functionalities, making it a pivotal aspect in the study of these complex materials [7,10].…”