pH-Responsive Rheology and Structure of Poly(ethylene oxide)-Poly(methacrylic acid) Interpolymer Complexes

被引：0

作者：

Schmidt, Robert Franz ^{[1
]}

Lutzki, Jana ^{[1
]}

Dalgliesh, Robert ^{[2
]}

Prevost, Sylvain ^{[3
]}

Gradzielski, Michael ^{[1
]}

机构：

[1] Tech Univ Berlin, Stranski Lab Phys & Theoret Chem, D-10623 Berlin, Germany

[2] Sci & Technol Facil Council, Rutherford Appleton Lab, ISIS Pulsed Neutron & Muon Source, Didcot OX11 0QX, England

[3] Inst Laue Langevin ILL, F-38042 Grenoble, France

来源：

MACROMOLECULES | 2025年 / 58卷 / 01期

关键词：

HYDROGEN-BONDED COMPLEXES; POLY(ACRYLIC ACID); POLY(METHACRYLIC ACID); VISCOELASTIC PROPERTIES; POLYCARBOXYLIC ACIDS; NEUTRON-SCATTERING; CARBOXYLIC-ACIDS; MOLECULAR-WEIGHT; GLASS-ELECTRODE; SHAPE-MEMORY;

D O I：

10.1021/acs.macromol.4c02726

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

This study investigates the rheological and structural properties of interpolymer complexes (IPCs) formed between poly(ethylene oxide) (PEO) and poly(methacrylic acid) (PMAA) at various pH levels and polymer ratios. Potentiometric titration showed that PMAA must remain over 90% protonated for IPC formation. Extensive rheological experiments revealed a sharp transition from viscous to elastic behavior between pH 5.75 and 4.75. The rheological response is attributed to PEO chain entanglements and PEO-PMAA hydrogen-bond cross-links, with cross-links dominating at low pH and weakening as pH increases. Small-angle neutron scattering (SANS) highlights the structural changes, with dense, PMAA-rich domains forming at low pH and breaking down at higher pH. This work provides valuable new insights for the design of hydrogels, whose properties are easily tuned by the polymer mixing ratio and pH, offering potential for various pharmaceutical applications.

引用

页码：321 / 333

页数：13

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