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 … 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...

Grating assembly in periodic crystal aggregates of ... - SpringerLink

WebCircular Birefringence of Banded Spherulites Xiaoyan Cui,†Alexander G. Shtukenberg,*, †John Freudenthal,†Shane Nichols,†Bart Kahr*† †Department of Chemistry, New York … 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. portland chainsaw company

Polymer spherulites: A critical review - ScienceDirect

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 … WebApr 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. WebBanded 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 … optical tracker