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Upper Critical Solution Temperature of Poly(N-acryloyl glycinamide) in Water: A Concealed Property

Title data

Seuring, Jan ; Bayer, Frank M. ; Huber, Klaus ; Agarwal, Seema:
Upper Critical Solution Temperature of Poly(N-acryloyl glycinamide) in Water: A Concealed Property.
In: Macromolecules. Vol. 45 (10 January 2012) Issue 1 . - pp. 374-384.
ISSN 0024-9297
DOI: https://doi.org/10.1021/ma202059t

Official URL: Volltext

Project information

Project financing: University of Marburg

Abstract in another language

Polymers showing an upper critical solution temperature (UCST) in water are rare. Recently, the nonionic homopolymer poly(N-acryloyl glycinamide) (poly(NAGA)) has been shown to exhibit a sharp upper critical solution temperature in pure water as well as in electrolyte solution. Although poly(NAGA) is known for decades the UCST behavior had not been reported. The first controlled radical polymerization of poly(NAGA) by the RAFT (reversible addition–fragmentation transfer) process was also achieved recently, but no UCST was observed. The present study shows that traces of ionic groups in the polymer prevent phase separation. Failure to notice the UCST in the past was because ionic groups have been introduced unintentionally by either acrylate impurities in the monomer, hydrolysis of the polymer side chains, and/or usage of ionic initiators or chain transfer agents. A synthetic procedure for high purity NAGA monomer free of ionic impurities is reported. It is also shown how to obtain stable aqueous solutions of nonionic poly(NAGA) so that the UCST behavior can be exploited in pure water as well as in a physiological milieu. Further, ultrasensitive differential scanning calorimetry and light scattering were used to get insights into the phase separation mechanism. We believe that this knowledge is transferable to other systems and will greatly accelerate research in the field of macromolecules that feature thermally reversible hydrogen bonding.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: REVERSIBLE GEL SYSTEMS; AQUEOUS-SOLUTIONS; PHASE-TRANSITION; POLY(ACRYLIC ACID); ACRYLIC-ACID; DRUG RELEASE; COPOLYMERS; POLY(N-ISOPROPYLACRYLAMIDE); POLYACRYLAMIDE; POLYMERS
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Profile Fields > Advanced Fields > Polymer and Colloid Science
Research Institutions > Research Centres > Bayreuth Center for Colloids and Interfaces - BZKG
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Profile Fields
Profile Fields > Advanced Fields
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: No
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 01 Apr 2015 14:01
Last Modified: 01 Apr 2015 14:01
URI: https://eref.uni-bayreuth.de/id/eprint/9795