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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

Thermoresponsive Property of Poly(N,N-bis(2-methoxyethyl)acrylamide) and Its Copolymers with Water-Soluble

Xiangming Fu¹, Yanqiu Wang¹, Liang Xu¹

¹Research Center for Polymer Materials, School of Materials Science and Engineering, Changchun University of Science and Technology, Weixing Road 7989, Changchun 130022, China.

|December 23, 2023

Abstract:

The group-transfer polymerization (GTP) of N,N-bis(2-methoxyethyl)acrylamide (MOEAm) initiated by Me₂EtSiH in the hydrosilylation-promoted method and by silylketene acetal (SKA) in the conventional method proceeded in a controlled/living manner to provide poly(N,N-bis(2-methoxyethyl)acrylamide) (PMOEAm) and PMOEAm with the SKA residue at the α-chain end (MCIP-PMOEAm), respectively. PMOEAm-b-poly(N,N-dimethylacrylamide) (PDMAm) and PMOEAm-s-PDMAm and PMOEAm-b-poly(N,N-bis(2-ethoxyethyl)acrylamide) (PEOEAm) and PMOEAm-s-PEOEAm were synthesized by the block and random group-transfer copolymerization of MOEAm and N,N-dimethylacrylamide or N,N-bis(2-ethoxyethyl)acrylamide. The homo- and copolymer structures affected the thermoresponsive properties; the cloud point temperature (T_cp) increasing by decreasing the degree of polymerization (x). The chain-end group in PMOEAm affected the T_cp with PMOEAm_x > MCIP-PMOEAm_x. The T_cp of statistical copolymers was higher than that of block copolymers, with PMOEAm_x-s-PDMAm_y > PMOEAm_x-b-PDMAm_y and PMOEAm_x-s-PEOEAm_y > PMOEAm_x-b-PEOEAm_y.

Keywords:

cloud point temperature group transfer polymerization hydrosilylation-promoted GTP poly(N,N-bis(2-methoxyethyl)acrylamide)thermoresponsive property

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