Dual Stimuli-Responsive Comb Polymers from Modular N-Acylated Poly(aminoester)-Based Macromonomers
详细信息 查看全文
- 作者：Patrick A. J. M. de Jongh ; Alice Mortiboy ; Greg S. Sulley ; Mechelle R. Bennett ; Athina Anastasaki ; Paul Wilson ; David M. Haddleton ; Kristian Kempe
- 刊名：ACS Macro Letters
- 出版年：2016
- 出版时间：March 15, 2016
- 年：2016
- 卷：5
- 期：3
- 页码：321-325
- 全文大小：352K
- ISSN：2161-1653
文摘
We report the synthesis of dual-responsive N-acylated poly(aminoester) (NPAE)-based comb polymers with varying molecular composition and monomer sequence via a combination of spontaneous zwitterionic copolymerization and redox-initiated reversible addition–fragmentation chain transfer (RRAFT) polymerization. NPAE macromonomers were synthesized from different nucleophilic (MN), for example, 2-ethyl-2-oxazoline (EtOx) or 2-ethyl-2-oxazine (EtOz), and electrophilic monomers (ME), for example, acrylic acid (AA) or 2-carboxyethyl acrylate (CEA), to tune the hydrophilicity and sequence of the systems. The latter was found to influence the thermal properties and stability of the respective comb polymers. Turbidity investigations in aqueous solution revealed a dual-responsive behavior of the comb polymers being responsive to both temperature and pH changes due to ω-carboxylic end groups of the NPAE-based macromonomers. Additional methylene groups in the NPAE backbone rendered the corresponding systems more hydrophobic and, hence, decreased the cloud point temperatures and, at the same time, increased the pH values (at constant temperature) at which the polymer phase separates from the aqueous solution.