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Open AccessArticle

Temperature and Recognition Dual Responsive Poly(N-Isopropylacrylamide) and Poly(N,N-Dimethylacrylamide) with Adamantyl Side Group

1
School of Chemistry and Materials Engineering, Fuyang Normal University, Fuyang 236037, China
2
Anhui Provincial Key Laboratory for Degradation and Monitoring of the Pollution of the Environment, Fuyang 236037, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(4), 473; https://doi.org/10.3390/ma11040473
Received: 27 February 2018 / Revised: 21 March 2018 / Accepted: 21 March 2018 / Published: 22 March 2018
(This article belongs to the Special Issue Temperature-Responsive Polymers)
A series of copolymers with an adamantyl side group (poly(NIPAM-co-AdMA) and poly(DMAM-co-AdMA)) were prepared by radical copolymerization of N-isopropylacrylamide (NIPAM) and N,N-dimethylacrylamide (DMAM) with a 2-methyl-2-adamantylmethacrylate (AdMA) monomer. The structure and composition of the as-synthesized copolymers were characterized by Fourier transform infrared (FT-IR) spectroscopy, proton nuclear magnetic resonance (1H NMR) spectroscopy, gel permeation chromatography (GPC), thermogravimetric analysis (TGA), and elemental analysis. Temperature and recognition dual responsivity of the copolymers was investigated by cloud point (Tcp) and dynamic light scattering (DLS), respectively. The results show that the as-synthesized copolymers are a kind of temperature-responsive polymer with a lower critical solution temperature (LCST). Tcp was approximately consistent with the critical temperature of intermolecular copolymer association (Tass) from DLS. For these copolymers, Tcp decreases with increasing content of AdMA unit in the copolymers. After the addition of β-cyclodextrins (β-CD), Tcp increases, and the increment of Tcp values gradually became large with increasing content of AdMA in the copolymers. It is host-guest molecular recognition of β-CD and adamantyl groups that endows the as-synthesized copolymers with recognition-tunable thermosensitivity. View Full-Text
Keywords: temperature responsive; molecular recognition; poly(N-isopropylacrylamide); poly(N,N-dimethylacrylamide); adamntyl groups; β-cyclodextrins temperature responsive; molecular recognition; poly(N-isopropylacrylamide); poly(N,N-dimethylacrylamide); adamntyl groups; β-cyclodextrins
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Dong, Q.; Luo, C.; Li, N.; Chi, J.; Zhang, Q. Temperature and Recognition Dual Responsive Poly(N-Isopropylacrylamide) and Poly(N,N-Dimethylacrylamide) with Adamantyl Side Group. Materials 2018, 11, 473.

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