Temperature and Salt Responsivity of Anionic, Cationic and Amphoteric Nanogels Based on N-Isopropylacrylamide, 2-Acrylamido-2-Methyl-1-Propanesulfonic Acid Sodium Salt and (3-Acrylamidopropyl) Trimethylammonium Chloride

N-изопропилакриламид, 2-акриламидо-2-метил-1-пропансульфон қышқылы натрий тұзы және (3-акриламидопропил)триметиламмоний хлориді негізіндегі анионды, катионды және амфотерлі наногельдердің температураға және тұзға сезімталдығы
Температурная и солевая чувствительность анионного, катионного и амфотерного наногелей на основе N-изопропилакриламида, натриевой соли 2-акриламидо-2-метил-1-пропансульфоновой кислоты и (3-акриламидопропил)триметиламмоний хлорида
Ayazbayeva A.Y. Shakhvorostov A.V. Kudaibergenov S.E.
2022 E.A.Buketov Karaganda State University Publish House

Bulletin of the Karaganda University Chemistry Series
2022 #108 Issue 4 14 - 24 pp.

Three different nanogels possessing anionic, cationic and amphoteric character were synthesized via conventional redox initiated free radical copolymerization of N-isopropylacrylamide (NIPAM), 2-acrylamido-2-methyl-1-propanesulfonic acid sodium salt (AMPS) and (3-acrylamidopropyl) trimethylammonium chloride (APTAC). The negatively charged [NIPAM]:[AMPS] = 90:10 mol.%, positively charged [NIPAM]:[APTAC] = = 90:10 mol.%, and charge-balanced amphoteric nanogels [NIPAM]:[APTAC]:[AMPS] = 90:5:5 mol.% abbreviated as NIPAM₉₀-AMPS₁₀, NIPAM₉₀-APTAC₁₀, and NIPAM₉₀-APTAC₅-AMPS₅, respectively, were characterized by FTIR spectroscopy, TGA, UV-Vis spectroscopy and DLS measurements. The temperature and salt responsive properties of nanogels in aqueous and aqueous-salt solutions were studied in the temperature range of 25–60 °C and ionic strength (µ) of 0.001–1.0 M NaCl. Anionic NIPAM₉₀-AMPS₁₀ and cationic NIPAM₉₀-APTAC₁₀ nanogels, exhibit a pronounced polyelectrolyte effect in aqueous-salt solution due to screening of the negative or positive charges by low-molecular-weight salt. Whereas the charge-balanced amphoteric nanogel NIPAM₉₀-APTAC₅-AMPS₅ exhibits an antipolyelectrolyte effect due to the screening of electrostatic attraction between opposite charges by low-molecular-weight salt. The difference between the temperature-dependent behaviors of anionic, cationic and amphoteric nanogels is explained by shrinking (polyelectrolyte effect) and expanding (antipolyelectrolyte effect) of macromolecular chains in aqueous-salt solutions.

amphoteric nanogel , anionic nanogel , cationic nanogel , ionic monomers , poly-N-isopropylacrylamide , polyampholyte nanogels , volume phase transition temperature

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Satbayev University, Satpayev str., 22, Almaty, 050013, Kazakhstan
Institute of Polymer Materials and Technology, Atyrau-1, 3/1, Almaty, 050019, Kazakhstan
Chemical Sciences, Institute of Polymer Materials and Technology, Atyrau-1, 3/1, Almaty, 050019, Kazakhstan

Satbayev University
Institute of Polymer Materials and Technology
Chemical Sciences

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