Next Article in Journal
Previous Article in Journal
Previous Article in Special Issue
Polymers 2012, 4(1), 32-45; doi:10.3390/polym4010032
Article

Solution Properties of Water-Soluble “Smart” Poly(N-acryloyl-N′-ethyl piperazine-co-methyl methacrylate)

Received: 28 November 2011; in revised form: 21 December 2011 / Accepted: 5 January 2012 / Published: 5 January 2012
(This article belongs to the Special Issue Water-Soluble Polymers)
View Full-Text   |   Download PDF [397 KB, uploaded 5 January 2012]
Abstract: Water-soluble copolymers of N-acryloyl-N′-ethylpiperazine (AcrNEP) with methyl methacrylate (MMA) were synthesized to high conversion by free-radical solution polymerization. The composition of the copolymers was determined using Fourier Transform Infra-red Spectroscopy (FTIR). Copolymers containing AcrNEP content above 44 mol% were readily soluble in water and exhibited the critical solution temperature behavior. The copolymers were strongly responsive to changes in pH of the external medium due to the presence of tertiary amine functions that could be protonated at low pH. The influence of various factors such as copolymer composition, pH, temperature, salt and surfactant concentration on the LCST of the copolymers were systematically studied. The intrinsic viscosity of the copolymers in dimethyl formamide decreased with increase in temperature due to a decrease in thermodynamic affinity between polymer chains and solvent molecules. The viscosity behavior of the copolymers in sodium chloride solution was similar to that of classical polyelectrolytes and hydrophobically modified polyacrylate systems.
Keywords: water-soluble polymers; piperazine; viscosity; critical solution temperature water-soluble polymers; piperazine; viscosity; critical solution temperature
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Export to BibTeX |
EndNote


MDPI and ACS Style

Deen, G.R. Solution Properties of Water-Soluble “Smart” Poly(N-acryloyl-N′-ethyl piperazine-co-methyl methacrylate). Polymers 2012, 4, 32-45.

AMA Style

Deen GR. Solution Properties of Water-Soluble “Smart” Poly(N-acryloyl-N′-ethyl piperazine-co-methyl methacrylate). Polymers. 2012; 4(1):32-45.

Chicago/Turabian Style

Deen, G. Roshan. 2012. "Solution Properties of Water-Soluble “Smart” Poly(N-acryloyl-N′-ethyl piperazine-co-methyl methacrylate)." Polymers 4, no. 1: 32-45.


Polymers EISSN 2073-4360 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert