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. WebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale …
Circular birefringence of banded spherulites
Did you know?
WebWe 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...
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 … WebThere 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.
WebMar 13, 2014 · Circular birefringence (CB) has recently been used to interrogate banded spherulites. Cui et al. [45] observe that CB oscillates along the radius, 90 • out of phase … 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 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 …
WebSep 7, 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 polylactide enantiomers were … immunotherapy lung cancer drugsWebBanded spherulites of PEA, PBS and their PBS–PEA blends were studied by optical and atomic force microscopies. It was found that PEA forms a regular banded structure … immunotherapy malaysiaWebJan 16, 2024 · Radially grown spherulites are obtained by most substances crystallized from melt. The circular arrangement of elongated crystals reflects the optical behaviour of each crystal and, because of... immunotherapy mabsWeb开馆时间：周一至周日7:00-22:30 周五 7:00-12:00; 我的图书馆 list of when states became statesWebcircular crack was observed in the non-banded spherulite, while multiple circular cracks were concentrically formed in the banded spherulite. For both spherulites, brightness of … list of white christmas in ukWebThe circular birefringence is shown to be a consequence of misoriented, overlapping anisotropic lamellae, a kind of optical activity associated with the mesoscale … immunotherapy medicaidWebJul 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... immunotherapy market