Circular birefringence of banded spherulites
WebJan 31, 2024 · Crystal assembly by crystallization and self-aggregation into periodicity, viewed as circular ring bands in optical birefringence patterns, in the family of aliphatic polyesters is surveyed. The periodic packing in all polyesters shares similarity of grating architectures in interiors and banding on top surfaces. WebCircular Birefringence of Banded Spherulites Xiaoyan Cui,†Alexander G. Shtukenberg,*, †John Freudenthal,†Shane Nichols,†Bart Kahr*† †Department of Chemistry, New York …
Circular birefringence of banded spherulites
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WebCircular birefringence of banded spherulites. X Cui, AG Shtukenberg, J Freudenthal, S Nichols, B Kahr. Journal of the American Chemical Society 136 (14), 5481-5490, 2014. 51: 2014: Complete polarimetry on the asymmetric … WebSep 23, 2024 · A novel 3D growth mechanism of ring-banded spherulite is proposed. 2. Experimental 2.1. Materials and Preparation PBA and PEO were dissolved into chloroform and made into a 2 wt.% polymer solution. PBA was purchased from Aldrich Chemical Company, Inc. (St. Louis, MO, USA), with M w = 12,000 g/mol, T g = −66.2 °C, and T m …
WebThe circular-extinction bands of PDT of nanometer films (300-400 nm) are composed of parallel lamellae with the terrace alignment pointing along the circumferential direction; the... WebDec 7, 1999 · We discuss and evaluate methods for determining handedness of twisting, particularly in tightly banded spherulites, and illustrate them by application to poly(3 …
Web开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆 WebApr 8, 2014 · Circular Birefringence of Banded Spherulites Crystal optical properties of banded spherulites of 21 different compounds molecular crystals, polymers, and …
WebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale …
WebAug 12, 2011 · The circular birefringence of polycrystalline polymers is invariably obscured by strong linear birefringence. To parse the two mechanisms of light retardation, polycrystalline spherulites of... diverse corporate technologies forest city ncWebThere are two types of spherulites grown from the melt at high temperature (up to 60 °C). The most common is a spherulite from the nonpolar phase (α form), which is larger and has high birefringence and tightly spaced concentric bonding. The second type is smaller and has less birefringence, and comes from the γ phase. diversecreatives.comWebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale … diverse controls cedar rapids iowaWebMar 6, 2013 · Mueller matrix imaging reveals radial oscillations in not only linear birefringence, but also circular birefringence, whose origin is explained through slight (∼1.3°) but systematic splaying... diverseco sharepointWebJul 1, 2015 · A recent article [29] has just attempted to address the inherent constraint of analyses based on only the top-surface morphology of ring-banded polymers spherulites, which may not suffice in... cracked silithid carapaceWebWe report stress birefringence measurements for small (up to 150 mm x 150 mm) samples such as Si slabs, wafers and small ingot segments. Measured stress birefringence in an Si ingot segment... diverse corn beltWebApr 28, 2004 · The lamellae exhibit complicated growth behaviors: twisting, bending, backward growth, and branching. The lamellae continuously twist to show alternating edge-on and flat-on views along the radii of the spherulites. Giant screw dislocations bring forth to the birth of new lamellae. diverse corporate photo