Radial structure of commercial styrene-co-butyl acrylate latex particles by means of synchrotron small-angle X-ray scattering under contrast-variation conditions

Chen, Xuelian; Zhang, Jianqi; Yi, Zhiyong; Wang, Qiao; Li, Xiuhong; Bian, Fenggang; Wang, Jie; Men, Yongfeng

doi:10.1007/s11998-010-9314-x

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…Chen et al used SAXS to determine with high accuracy the radial structure of core-shell polystyrene/poly(butyl acrylate) particles, using various concentrations of sucrose to assure appropriate contrast of the polymers' electron density [94]. The estimated shell thickness was equal to 2 nm.…”

Section: Small-angle Scattering Methodsmentioning

confidence: 99%

Characterization methods of polymer core–shell particles

Gosecka

Gosecki

2015

Colloid Polym Sci

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The design and synthesis of various polymer coreshell particles result from their distinct characteristics, which combine the properties of two or more components into one material. Many accessible synthetic strategies for obtaining polymer core-shell particles lead to the formation of particles for which the internal morphology differs from the ideal coreshell structure. Understanding the precise morphology characteristics is important for mechanistic studies of particle formation, which ultimately results in the design of particles for specific structures and properties. The detailed characteristics of complex polymer particle structures are complicated and require more than one method. This review focuses on imaging methods such as transmission electron microscopy (TEM), cryo-TEM, scanning transmission electron microscopy (STEM) and confocal fluorescence microscopy that reveal the radial redistribution of the components and methods for the quantitative analysis of individual phases (core, shell and interfacial layer), such as small-angle X-ray scattering (SAXS), small-angle neutron scattering (SANS), differential scanning calorimetry (DSC) and nuclear magnetic resonance (NMR). Methods that can determine the surface composition and makeup of the character of interfacial layer (gradient or containing small domains, etc.) were also reviewed.

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Section: Small-angle Scattering Methodsmentioning

confidence: 99%

Characterization methods of polymer core–shell particles

Gosecka

Gosecki

2015

Colloid Polym Sci

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Competitive adsorption of amylopectin and amylose on cationic nanoparticles: a study on the aggregation mechanism

et al. 2016

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In this study we investigate the interactions between cationic nanoparticles and anionic starch, where the starch was composed of 20 wt% of amylose, a linear polymer, and 80 wt% of amylopectin, a branched polymer. The mechanism of aggregation was investigated by scattering techniques. It was found that the cationic particles formed large aggregates with the starch as a result of selective adsorption of the amylopectin. Amylose did not participate significantly in the aggregate formation even when the charge ratio of starch to particles was <1. For starch to particle ratio >1 stabilization was recovered mostly due to the large hindrance brought about by the highly branched amylopectin. This results in a shift of the stabilization mechanism from electrostatic to electrosteric. The internal structure of the aggregates was composed of primary particles with starch coils adsorbed on the surface. This information supports the proposed aggregation mechanism, which is based on adsorption of the negatively charged starch in patches on the positively charged nanoparticles causing attractive interaction between the particles.

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Analytical Model to Deduce the Conformational and Dynamical Behavior in Dendrimers: A Review

Bhardwaj,

Kumar

2024

Polymers

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This review utilizes an optimized Rouse–Zimm discrete hydrodynamic model and the preaveraged Oseen tensor, which accurately consider hydrodynamic interactions to study model dendrimers. We report the analytical theories that have been previously developed for the creation of generalized analytical models for dendrimers. These generalized theories were used to assess the conformational and dynamical behavior of the dendrimers. By including stiffness in the bonds, the neglect of excluded volume interactions may be somewhat offset. This is true at least in the case of short spacers. While the topological limitations on the directions and orientations of the individual bond vectors in dendrimers implement semiflexibility, the intensity of these contacts was determined by the potential geometric orientations of the bonds, and later on the excluded volume interactions in dendrimers, which were described in terms of the effective co-volume between nearest non-bonded monomers and modeled using the delta function pseudopotential. With the aid of the models developed, the authors condensed various conformational and dynamic properties of dendrimers that depend on their degree of semiflexibility and the strength of the excluded volume. These analyses came to the conclusion that the flexible dendrimer in one limit and the earlier described freely rotating model of dendrimers in the other constitute a highly generalized way of capturing a wide range of conformations in the developed mathematical model in dendrimers.

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Radial structure of commercial styrene-co-butyl acrylate latex particles by means of synchrotron small-angle X-ray scattering under contrast-variation conditions

Cited by 3 publications

References 34 publications

Characterization methods of polymer core–shell particles

Characterization methods of polymer core–shell particles

Competitive adsorption of amylopectin and amylose on cationic nanoparticles: a study on the aggregation mechanism

Analytical Model to Deduce the Conformational and Dynamical Behavior in Dendrimers: A Review

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