Competitive Molecular‐/Ion‐Recognition Responsive Characteristics of Poly(N‐isopropylacrylamide‐co‐benzo‐12‐crown‐4‐acrylamide) Copolymers with Benzo‐12‐crown‐4 as Both Guest and Host Units. Issue 14 (9th April 2014)

• Record Type: Journal Article
• Authors: Wang, Yin‐Mei; Ju, Xiao‐Jie; Liu, Zhuang; Xie, Rui; Wang, Wei; Wu, Jiang‐Feng; Zhang, Yan‐Qiong; Chu, Liang‐Yin
• Is Part Of: Macromolecular rapid communications. Volume 35:Issue 14(2014:Jul.)
• Page Start: 1280
• Page End: 1286
• Publication Date: 2014-04-09
• Subjects: Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201400054
• Languages: English
• ISSNs: 1022-1336

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>Novel dual molecular‐ and ion‐recognition responsive poly(<italic>N</italic>‐isopropylacrylamide‐<italic>co</italic>‐benzo‐12‐crown‐4‐acrylamide) (PNB<sub>12</sub>C<sub>4</sub>) linear copolymers with benzo‐12‐crown‐4 (B12C4) as both guest and host units are prepared. The copolymers exhibit highly selective sensitivities toward <italic>γ</italic>‐cyclodextrin (<italic>γ</italic>‐CD) and Na<sup>+</sup>. The presence of <italic>γ</italic>‐CD induces the lower critical solution temperature (LCST) of PNB<sub>12</sub>C<sub>4</sub> copolymer to shift to a higher value due to the formation of 1:1 <italic>γ</italic>‐CD/B12C4 host‐guest inclusion complexes, while Na<sup>+</sup> causes a negative shift in LCST due to the formation of 2:1 "sandwich" B12C4/Na<sup>+</sup> host‐guest complexes. Regardless of the complexation order, when <italic>γ</italic>‐CD and Na<sup>+</sup> coexist with PNB<sub>12</sub>C<sub>4</sub>, competitive complexation actions of B12C4 as both guest and host units toward <italic>γ</italic>‐CD and Na<sup>+</sup> finally form equilibrium 2:2:1 <italic>γ</italic>‐CD/B12C4/Na<sup>+</sup> composite complexes, and the final LCST values of PNB<sub>12</sub>C<sub>4</sub> copolymer reach almost the same level. The results provide valuable guidance for designing and applying PNB<sub>12</sub>C<sub>4</sub>‐based smart materials in various applications. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pght8nccr3" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>