Birefringence in polymers
WebOct 1, 1985 · Optical birefringence is usually linked to molecular orientation in polymers. Birefringence in materials used for optical applications represents non-isotropic optical … WebJan 1, 2013 · Birefringence of polymers should be controlled for some photonic devices.IntroductionA polymer molecular chain has a polarizability anisotropy originated …
Birefringence in polymers
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WebMay 9, 2024 · Here, ∆n 0 is an intrinsic birefringence, which is determined by the repeating unit of the polymer. F is an orientation function, which shows the degree of orientation of the polymer chain. In ... WebJan 1, 2013 · Compensation of orientational birefringence for drawn films of the zero-birefringence polymers was analyzed by the rotating parallel nicols method, and orientation functions for polymer main ...
WebMay 2, 2024 · Biodegradable semicrystalline polymers are broadly used in microfluidic techniques to create microdroplets for various applications. However, it remains a … WebOct 26, 2024 · The present birefringence calculation method is based on the stress-birefringence law and is still difficult in accurate prediction, owing to extremely difficulty …
WebAbstract. A comparison between the efforts which have been made in characterizing flow properties of polymer melts with the aid of mechanical and optical measurements, shows that a lot more interesting work can be done in the latter field. One of the aims of the present compilation is to show how helpful flow birefringence measurements can be ... WebOriented polyethylene films, in which stacked lamellae grow perpendicular to the flow direction, can show extraordinary wavelength dispersion of birefringence; i.e., birefringence increases with wavelength. Owing to the periodical change of the refractive indices between the crystalline and amorphous layers along the flow direction, with …
WebThe form birefringence phenomenon has been used by Canavorolo et al. 44 to examine rheological behaviour and transitions in SBS. Form birefringence has also been noted as a contributor to spherulite birefringence in crystalline polymers. 45 There is however considerable disagreement as to the size of this contribution. In practice, disregarding ...
WebJan 29, 2014 · For ordinary amorphous polymers, the relationship between strain-induced birefringence and stress can be written with the modified stress-optical rule, MSOR. 13 … the pho house bradentonWebMay 2, 2024 · Biodegradable semicrystalline polymers are broadly used in microfluidic techniques to create microdroplets for various applications. However, it remains a fundamental challenge to modulate polymer … the pholosopher facebookWebdouble refraction, also called birefringence, an optical property in which a single ray of unpolarized light entering an anisotropic medium is split into two rays, each traveling in a … the pholhas sucessosWebApr 22, 2024 · Recent progress on the molecular interpretation of strain-induced birefringence for amorphous polymers over a wide time/temperature region is briefly … the pho kingWebGiant Birefringent Optics in Multilayer Polymer Mirrors Michael F. Weber, Carl A. Stover, Larry R. Gilbert, Timothy J. Nevitt, Andrew J. Ouderkirk* Multilayer mirrors that maintain or increase their reßectivity with increasing in-cidence angle can be constructed using polymers that exhibit large birefringence in their indices of refraction. sick leave per annumWebMar 31, 2000 · When birefringence is on the order of the change of the in-plane refractive index between adjacent material layers, surprising and useful optical effects occur. We refer to these effects as giant birefringent optics (GBO). A central feature of GBO is improved control of the reflectivity of p-polarized light. the pho in modesto caWebBirefringence analysis is normally conducted at a wavelength of 633nm, but other wavelengths can be used if necessary. The birefringence test method utilises reflectivity measurement, and determines the refractive … the pholhas