Diffusion of hairy polymeric micelles in a homopolymer solution

Chen, Hongwei; Lu, Yijie; Shen, Lei; Liu, Xiaobing; Zhang, Guangzhao

doi:10.1016/j.polymer.2008.03.007

Cited by 2 publications

(3 citation statements)

References 33 publications

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“…Strongly interacting emulsions form a diverse class of complex fluid that displays elastic behavior up to a yield stress . Emulsion interactions may be mediated through Coulombic or solvent forces, or through entanglements between micelles having long-chain grafts on their surfaces. , Often referred to as pseudoplastic liquids, studies of the rheological properties of ketchup, mayonnaise, toothpaste, and other strongly interacting microgels have provided a framework for understanding their properties.…”

Section: Resultsmentioning

confidence: 99%

Complex Fluids Based on Methacrylated Hyaluronic Acid

et al. 2010

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We present the preparation and characterization of viscoelastic formulations of hyaluronic acid functionalized with polymerizable methacrylate groups. We explored three different processing strategies for controlling microstructure and interchain interactions: lightly cross-linked near-gels, emulsion-cross-linked microspheres, and an elastic microgel formed through centrifuging the microspheres. The component structure and rheological properties of these formulations were compared to those of high molecular weight hyaluronic acid solutions, which displayed classical behavior of high molecular weight polymer solutions reported by other investigators. We demonstrate that these processing strategies allow the tuning of solution properties from strongly viscoelastic behavior, observed in lightly cross-linked near-gels and concentrated microsphere solutions to elastic behavior in elastic microgels, behaving like pseudoplastic liquids having a well-defined yield stress above which viscous behavior was observed. In the centrifuged microspheres, the hyaluronic acid degree of methacrylation was inversely proportional to the gel elasticity, and a mechanism based on failure due to microsphere brittleness is proposed to explain this behavior. These results suggest that processing methacrylated hyaluronic acid can lead to a diversity of solution properties, providing methods for delivering this biologically active polymer in a broad range of applications.

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Section: Resultsmentioning

confidence: 99%

Complex Fluids Based on Methacrylated Hyaluronic Acid

et al. 2010

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“…The existence of a rigid amorphous component in semicrystalline polymers can be revealed also by solid-state NMR. [64][65][66] The RAF content in poly[(R)-3-hydroxybutyrate] (PHB) and its copolymers poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) was found to decrease with increasing the 3-hydroxyvalerate content and with increasing the temperature, and higher for the homopolymer. The high brittleness of PHB was thus attributed to these rigid noncrystalline regions, whereas the improvement of the mechanical properties of PHBV to the higher overall mobility of the noncrystalline fractions.…”

Section: Quantitative Analysis Of the Rafmentioning

confidence: 99%

“…The high brittleness of PHB was thus attributed to these rigid noncrystalline regions, whereas the improvement of the mechanical properties of PHBV to the higher overall mobility of the noncrystalline fractions. [64]…”

Section: Quantitative Analysis Of the Rafmentioning

confidence: 99%

Crystallization-induced formation of rigid amorphous fraction

Lorenzo

Righetti

2018

Polymer Crystallization

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Semicrystalline polymers contain amorphous fractions of different mobility that develop upon crystallization or ordering. The restraints created by the ordered phase, together with the entanglements present in the amorphous areas, set up a disordered nanophase called rigid amorphous fraction (RAF). The RAF is located at the crystal/amorphous boundary and mobilizes at temperatures higher than the glass transition of the mobile amorphous fraction. An updated three‐phase description of semicrystalline polymers is here depicted, with special attention given to the link between RAF vitrification and crystallization kinetics. The methods commonly used to quantify the RAF, and the influence of thermal history and crystal structure/morphology on the RAF, as well as the influence of RAF on materials properties, are presented and discussed in this review.

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Diffusion of hairy polymeric micelles in a homopolymer solution

Cited by 2 publications

References 33 publications

Complex Fluids Based on Methacrylated Hyaluronic Acid

Complex Fluids Based on Methacrylated Hyaluronic Acid

Crystallization-induced formation of rigid amorphous fraction

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