Quenched polyelectrolytes with hydrophobicity independent from chemical charge fraction: A SANS and SAXS study

Loại tài liệu:

Article

Tác giả:

Ben Mahmoud, S.

Đề mục:

Arabian Journal of Chemistry

Nhà xuất bản:

Elsevier Ltd.

Ngày xuất bản:

November 2017

Định dạng:

pdf

Nguồn gốc:

Arabian Journal of Chemistry, Volume 10, Issue 7, November 2017, Pages 1001-1014

Ngôn ngữ:

eng

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Lượt tải:

Nội dung

We investigate by SANS and SAXS the structure of semidilute aqueous hydrophobic quenched polyelectrolyte solutions, in which we can vary independently the hydrophobicity and the chemical/electrostatic charge fraction (above the Manning condensation threshold 36%). Such a de-correlation is the original point of the work, reached using statistical tri-copolymers poly(acrylamide-co-styrene-co-2-acrylamido-2-methylpropane-sodium sulfonate), poly(AMx-co-STy-co-AMPSz). The hydrophobicity is brought by ST, the chemical electrostatic charge by AMPS and solubility without charge by AM. We consider that although these copolymers have chemical structure different from partially sulfonated polystyrene sulfonate, PS-co-SSNa, made of two monomers, one charged, one hydrophobic, they have however vicinal behavior. The variation of chemical charge, has no strong consequence on the structure properties which is in agreement with the fact that it is always larger than the Manning threshold. The dependence of q∗ with AM content shows that AM reduces hydrophobicity. The similarity with PS-co-SSNa, for which pearl necklace-like conformations were directly measured by SANS (form factor using ZAC method), suggests that pearl necklace conformations are also adopted by these tri-copolymers and that this behavior could be so generalized to a much larger range of synthetic hydrophobic polyelectrolytes using simple copolymerization.

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Quenched polyelectrolytes with hydrophobicity independent from chemical charge fraction: A SANS and SAXS study

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