Circular birefringence of banded spherulites
WebJul 18, 2016 · Ring-banded PLLA spherulites may be seen when melt-crystallized at 125~140 °C. However, at same Tc, ringless PLLA spherulites are resulted when the samples are subjected to cold … Webcircular crack was observed in the non-banded spherulite, while multiple circular cracks were concentrically formed in the banded spherulite. For both spherulites, brightness of …
Circular birefringence of banded spherulites
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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 … WebJul 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...
WebFrom the birefringence point of view, spherulites can be positive or negative. This distinction depends not on the orientation of the molecules (parallel or perpendicular to … WebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale …
WebDec 5, 2024 · The cracks in dendritic spherulites always are roughly random and not regularly circular or spiral shapes as those in circularly ring-banded spherulites. This is readily understandable as the dendritic lamellae in … 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...
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 …
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... onondaga county dental societyWebMar 17, 2024 · Banded spherulitic growth of crystal is observed in some materials with spherically symmetric growth front and periodic radial variation of birefringence. This … in windows 8 how to boot up to cdWebApr 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. onondaga county department of correctionsWebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale … onondaga county department of motor vehiclesWebSep 7, 2011 · The circular birefringence of polycrystalline polymers is invariably obscured by strong linear birefringence. To parse the two mechanisms of light retardation, … onondaga county daacWebMay 1, 2016 · The essential component of a spherulite is fibrillar crystals that grow in predominantly radial directions and branch irregularly. We review the growth, branching … in windows consoleWebFeb 13, 2024 · Spherulites are radially polycrystalline aggregates with an external spherical envelope. The hierarchical assembly of sophisticated spherulites architectures is a ubiquitous phenomenon in nature, such … onondaga county department of personnel