Small-angle x-ray-scattering study of ordering kinetics in a block copolymer

Harkless, C. R.; Singh, Mritunjay Kumar; Nagler, S. E.; Stephenson, G. B.; Jordan-Sweet, Jean

doi:10.1103/physrevlett.64.2285

Cited by 82 publications

(101 citation statements)

References 20 publications

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“…The predicted form for spherical-particle scattering (Glatter & Kratky, 1982, p. 23) consisting of a series of maxima and minima provides a stringent test for any desmearing process and is considered here. In addition, a numerical model of the scattering from a liquid (Harkless, Singh, Nagler, Stephenson & Jordan-Sweet, 1990) is considered. In each case, a nontrivial model of the beam-height profile, consisting of a constant amplitude at small y with a Gaussian decay, is used to smear the ideal profiles numerically.…”

Section: Applications To Model Datamentioning

confidence: 99%

A direct method of beam-height correction in small-angle X-ray scattering

Singh¹,

Ghosh²,

Shannon³

1993

J Appl Cryst

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A direct (i.e. noniterative) method for desmearing the beam-height effect in small-angle X-ray scattering is discussed. The method is applicable to rectangular collimation systems with arbitrary beam-height intensity profiles. The process involves the construction of an upper-triangular matrix of terms containing the resolution information. A straightforward back-substitution process can then be used to determine the ideal pinhole-collimated curve for any experimental curve obtained with the given resolution. The principal advantage of the method lies in its simplicity, which facilitates an examination of the propagation of random errors through the desmearing process. A comparison between the direct method and the iterative approach of Glatter [J. Appl. Cryst. (1974), 7, 147-153] is made to illustrate the efficiency of the technique.

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Section: Applications To Model Datamentioning

confidence: 99%

A direct method of beam-height correction in small-angle X-ray scattering

Singh¹,

Ghosh²,

Shannon³

1993

J Appl Cryst

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“…As a result, the Avrami model for crystallization kinetics has commonly been applied to these systems. 13 antioxidant Irganox 1010 (BASF SE) were used in this study. Kraton D1161 is a mixture of SIS and SI block copolymers with 18% SI content and 15% styrene content.…”

Section: Introductionmentioning

confidence: 99%

Isothermal Microphase Separation Kinetics in Blends of Asymmetric Styrene–Isoprene Block Copolymers

Dixit¹,

Pape²,

Rong

et al. 2015

Macromolecules

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The microphase separation behavior of Kraton D1161, a highly asymmetric styrene−isoprene triblock and diblock copolymer mixture often used as the base polymer in pressure-sensitive adhesives, was studied using time-resolved small-angle X-ray scattering (SAXS) and oscillatory rheological analysis during temperature ramp and temperature quench experiments. The total scattering intensity obtained from SAXS was represented as a sum of the scattering from disordered and ordered polystyrene domains. A modified Percus−Yevick hard-sphere model was used to describe the scattering from disordered spheres, while Gaussian functions were used to model scattering from ordered domains. The temperature-and time-dependent SAXS experiments suggest a sequence of four stages in the development of the copolymer morphology during the isothermal phase separation kinetics experiments. Avrami analysis of the shear modulus evolution following a temperature quench indicates that domain growth is preceded by nucleation process. The ordering of polystyrene domains as observed during rheological and SAXS analysis is dominated by polymer chain mobility, which resulted in slower kinetics at lower temperatures.

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“…The simple and effective way to study nano-confined polymer crystallization is to use crystalline-amorphous diblock copolymer as templates. A remarkable property of block copolymer is their ability to self-assemble in the melt into a variety of ordered structures with nanoscale periodicities via a microphase separation process [38][39][40][41][42]. Microphase separation is driven by the enthalpy of demixing the constituent components of the block copolymers, whilst macrophase separation is prevented by the chemical connectivity of the blocks.…”

Section: Soft Nanoconfinement On the Crystallization Behavior Of Peo-mentioning

confidence: 99%

Crystallization Behaviors and Structure Transitions of Biocompatible and Biodegradable Diblock Copolymers

Xue

Jiang

2014

Polymers

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Biocompatible and biodegradable block copolymers (BBCPs) containing crystalline blocks become increasingly important in polymer science, and have great potential applications in polymer materials. Crystallization in polymers is accompanied by the adoption of an extended conformation, or often by chain folding. It is important to distinguish between crystallization in homopolymers and in block copolymers. In homopolymers, chain folding leads to metastable structures introduced by the crystallization kinetics. In contrast, equilibrium chain folding in diblocks can be achieved as the equilibrium number of the folds is controlled by the size of the second block. The structures of BBCPs, which are determined by the competition between crystallization, microphase separation, kinetics and processing, have a tremendous influence on the final properties and applications. In this review, we present the recent advances on crystalline-crystalline diblock copolymer in our group.

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Small-angle x-ray-scattering study of ordering kinetics in a block copolymer

Cited by 82 publications

References 20 publications

A direct method of beam-height correction in small-angle X-ray scattering

A direct method of beam-height correction in small-angle X-ray scattering

Isothermal Microphase Separation Kinetics in Blends of Asymmetric Styrene–Isoprene Block Copolymers

Crystallization Behaviors and Structure Transitions of Biocompatible and Biodegradable Diblock Copolymers

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