scholarly journals The Influence of Synthesis Method on Characteristics of Buffer and Organic Solutions of Thermo- and pH-Responsive Poly(N-[3-(diethylamino)propyl]methacrylamide)s

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 282
Author(s):  
Maria Simonova ◽  
Denis Kamorin ◽  
Anton Sadikov ◽  
Alexander Filippov ◽  
Oleg Kazantsev
Keyword(s):  
Phase Separation ◽  
Free Radical ◽  
Radical Polymerization ◽  
Raft Polymerization ◽  
Synthesis Method ◽  
Free Radical Polymerization ◽  
Ph Responsive ◽  
Buffer Solutions ◽  
Ph Range ◽  
Organic Solutions

Thermo- and pH-responsive poly(N-[3-(diethylamino)propyl]methacrylamide)s were synthesized by free radical polymerization and RAFT polymerization. The molar masses of the samples were 33,000–35,000 g∙mol−1. Investigations of the dilute solutions showed that the prepared samples were flexible chain polymers. The behavior of the synthesized polymers in the buffer solutions was analyzed by turbidity and light scattering at a pH range of 7–13 and a concentration range of 0.0002–0.008 g·cm−3. When the concentrated solutions were at a low temperature, there were macromolecules and aggregates, which were formed due to the interaction of hydrophobic units. For the investigated samples, the lower critical solution temperatures were equal. The phase separation temperatures decreased as pH increased. The influence of polydispersity index on the characteristics of the samples in the solutions was analyzed. The radii of molecules of poly(N-[3-(diethylamino)propyl]methacrylamide) obtained by RAFT polymerization at this temperature at the onset and end of the phase separation interval were lower than ones for samples synthesized by conventional free radical polymerization.

scholarly journals Analysis of the Phase Separation Induced by a Free-Radical Polymerization in Solutions of Polyisobutylene in Isobornyl Methacrylate

2007 ◽  
Vol 46 (23) ◽  
pp. 7535-7542 ◽  
Author(s):  
Ezequiel R. Soulé, ◽  
Guillermo E. Eliçabe ◽  
Julio Borrajo ◽  
Roberto J. J. Williams
Keyword(s):  
Phase Separation ◽  
Free Radical ◽  
Radical Polymerization ◽  
Free Radical Polymerization

Modification of Polymeric Materials via Surface-Initiated Controlled/”Living” Radical Polymerization

e-Polymers ◽  
2007 ◽  
Vol 7 (1) ◽  
Author(s):  
Peng Liu
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Raft Polymerization ◽  
Free Radical Polymerization ◽  
Polymeric Materials ◽  
Polymer Surfaces ◽  
Reversible Addition ◽  
Living Free Radical Polymerization ◽  
Copolymer Brushes ◽  
Controlled Living Radical Polymerization

AbstractModification of polymeric materials has been a significant issue over last two decades in many fields of application. Among modification techniques developed to date, surface grafting has emerged as a simple, useful, and versatile approach to improve surface properties of polymers for a wide variety of applications. The synthesis of tethered block copolymer brushes via the use of controlled/”living” free radical polymerization techniques presents many significant advantages over traditional free radical polymerization techniques. This review surveys recent literature on polymer surfaces with graft chains, mainly focusing on grafting methods such as surface-initiated controlled/”living” free radical polymerization via atom transfer radical polymerization (ATRP), nitroxide-mediated radical polymerization (NMRP), reversible addition fragmentation transfer (RAFT) polymerization and iniferter techniques.

Chain Length Dependent Termination in Butyl Acrylate Free-Radical Polymerization Studied via Stationary and Pulsed Laser Initiated RAFT Polymerization

2005 ◽  
Vol 38 (23) ◽  
pp. 9497-9508 ◽  
Author(s):  
Tanja Junkers ◽  
Alexander Theis ◽  
Michael Buback ◽  
Thomas P. Davis ◽  
Martina H. Stenzel ◽  
...  
Keyword(s):  
Free Radical ◽  
Radical Polymerization ◽  
Chain Length ◽  
Butyl Acrylate ◽  
Raft Polymerization ◽  
Pulsed Laser ◽  
Free Radical Polymerization

Physically cross-linked pH-responsive chitosan-based hydrogels with enhanced mechanical performance for controlled drug delivery

RSC Advances ◽  
2016 ◽  
Vol 6 (107) ◽  
pp. 106035-106045 ◽  
Author(s):  
YuJu Che ◽  
Dongping Li ◽  
Yulong Liu ◽  
Qinglin Ma ◽  
Yebang Tan ◽  
...  
Keyword(s):  
Drug Delivery ◽  
Free Radical ◽  
Acrylic Acid ◽  
Radical Polymerization ◽  
Mechanical Performance ◽  
Free Radical Polymerization ◽  
Controlled Drug Delivery ◽  
Ph Responsive ◽  
Ethyl Methacrylate

A novel physically cross-linked pH-responsive hydrogel with enhanced mechanical performance was prepared from chitosan, acrylic acid and (2-dimethylamino) ethyl methacrylate via in situ free radical polymerization for controlled drug delivery.

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