Absorption of Cetylpyridinium Chloride into Poly

- Nov 04, 2017 -

The addition of cetylpyridinium chloride (CPC) to aqueous dispersions of poly(N-isopropylacrylamide) [poly(NIPAM)] and poly(N-isopropylacrylamide-co-acrylic acid) [poly(NIPAM-co-AAc)] mirogel particles leads to absorption of the CPC into the particles and to corresponding changes in their hydrodynamic diameter. With the latter set of particles there is a strong pH dependence. The dependence of both hydrodynamic diameter and electrophoretic mobility of the microgel particles on the added CPC concentration show a strong correlation with CPC uptake, as obtained from direct CPC absorption measurements. Various mechanisms for CPC absorption into the microgel particles are postulated, including electrostatic, polar, and hydrophobic interactions. A comparison has also been made between the effect of added CPC on the hydrodynamic diameter of free microgel particles in dispersion, determined by dynamic light scattering, and the thickness of adsorbed monolayers of the same microgel particles deposited on cationically modified, oxidized silicon surfaces, as determined from ellipsometry measurements. The trends observed in both cases are broadly similar. This work opens the way for development of microgel layers for controlled uptake and release applications. Absorption of Cetylpyridinium Chloride into Poly( N -isopropylacrylamide)-Based Microgel Particles, in Dispersion and as Surface-Deposited Monolayers.


Related Industry Knowledge

Related Products

  • Clear Pattern Embossed Paper for Semi-PU Leather for Bag and Sports Leather
  • Silicone Coated Paper for Microfiber Leather for Sports Cap and Shoes and Sofa
  • TPX Material High Termperaturer Resistant Release Paper for PVC Leather for Car Seat Cover and Flooring Leather
  • Silicone Coated Polyester Lucid or Red Anti-static PET Release Film
  • Transfer Film for Electronic Product and Offset Printing and Waterproof Membrane
  • CCK Release Paper for Medical and Adhesive Sticker and for Package