Scattering of Light by Two-Dimensional Spherulites

Clough, S. B.; Aartsen, J. J. Van; Stein, Richard S.

doi:10.1063/1.1702929

Cited by 174 publications

(29 citation statements)

References 16 publications

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“…The horizontal streak, similar to that observed by Yau (23), is characteristic of a rod-like structure oriented more-orless parallel to the stretching direction. With cooling to room temperature, this streak intensifies, particularly at the higher elongation, and the vertical lobe also intensifies and splits into two pair of lobes tilted toward the stretching direction, much as might be expected from a spherulitic structure extended perpendicularly to the stretching direction (28)(29).…”

Section: Light Scatteringmentioning

confidence: 99%

Optical studies of the stress‐induced crystallization of polymers

Stein

1976

Polymer Engineering & Sci

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Stress-induced crystallization may be studied by the birefringence technique and by low-angle light scattering. From measurements ofthe change in birefringence and stress during the crystallization of a polymer above its T , and from a calculation of the intrinsic birefringence of a polymer crystal, the change in volume fraction crystallinity may be calculated. The technique is illustrated for several polymers and found to give values in reasonable agreement with other methods for the study of crystallinity. Crystallization is also accompanied by the development of a low-angle light scattering pattern, the size and shape of' which i.; indicative of the amount, size and morphology of the crystalline superstructure.

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Section: Light Scatteringmentioning

confidence: 99%

Optical studies of the stress‐induced crystallization of polymers

Stein

1976

Polymer Engineering & Sci

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“…)i (15) where w is the twist angle, varying with z 1. For the homogeneous twisting of the optical axis, w=w(z1) =(2n/ P)z1 ( 16) In the forthcoming paper we shall consider the effect of inhomogeneous twisting, i.e., nonlinear variation of w with z1. 13 We shall treat 6 and b, as constants within the domain, i.e., the domain is homogeneous with 6 and b,.…”

Section: )mentioning

confidence: 99%

Supramolecular Structure of Polypeptides in Concentrated Solutions and Films. II. Small-Angle Light Scattering from Cholesteric Mesophase

Hashimoto

Ebisu

Inaba

et al. 1981

Polym J

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ABSTRACT:The cholesteric mesophase of poly(y-benzyl L-gultamate) in concentrated solutions of helicogenic solvents was investigated by the laser-light scattering technique. The observed, elastic scattering intensity distributions are theoretically explained in terms of the cholesteric domains embedded in an optically active medium. Analysis of the scattering patterns provides information on the identity period and sense of the cholesteric twisting.KEY WORDSThe laser-light scattering technique has been developed to characterize the supramolecular structure of polymeric systems in solution and in the liquid and solid states. In this series of papers, we study the application of this technique to the supramolecular structure of polypeptides in concentrated solutions and in solids.A number of reports have been published on the supramolecular structure of polymer liquid crystals. There are even a few papers dealing with the application of the scattering technique for analyzing the cholesteric pitch 1 • 2 or to qualitatively the orientation correlations (which exist in solutions and in solids) and variation in these with solvent, film preparing conditions3.4 and applied fields. 5 Our main purpose in this paper is to gain some insight into the elastic light scattering behavior of cholesteric liquid crystals so as to further expand applicability of this technique.We shall study, both theoretically and experimen-* Present address:

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“…This yields (see Fig. 1 (3) where N = [sing 6 sin2 E + cos2 6]1'2 and where 6 is the scattering angle, i.e., the angle between the incident beam ( S O ) and the scattered beam (s'); $ is the angle between the vertical and E,; p is the angle between the plane containing the incident and scattered rays and the XZ-plane; and e is (p + $).…”

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confidence: 99%