Macromol. Chem. Phys. 1/2017

Abstract

Back Cover: γ‐CD‐recognition responsive characteristics of poly(N‐isopropylacrylamide‐co‐benzo‐12‐crown‐4‐acrylamide) (PNB12C4) hydrogels are investigated. The formation of stable γ‐CD/B12C4 complexes induces positive shift of the volume phase transition temperature of PNB12C4 hydrogels. Increase of γ‐CD concentration in solution or B12C4 content in PNB12C4 copolymer networks can dramatically enhance the γ‐CD‐recognition sensitivity of the PNB12C4 hydrogels. This is reported by Yun‐Yan Wei, Zhuang Liu, Xiao‐Jie Ju,* Kun Shi, Rui Xie, Wei Wang, Zhengdong Cheng, and Liang‐Yin Chu* in article number 1600386.

A Novel Poly(N‐Isopropylacrylamide‐co‐acryloylamidobenzo‐12‐crown‐4) Microgel with Rapid Stimuli‐Responsiveness for Molecule‐Specific Adsorption of γ‐Cyclodextrin

“…The size of crown ether group in B 12 C 4 is 0.73 nm, which could be selectively captured by γ‐CD to form a stable γ‐CD/B 12 C 4 inclusion complex. While the small cavity of α‐CD or β‐CD cannot form such kind of stable inclusions . When γ‐CD appears, the hydrophobic cavity of γ‐CD can selectively capture the B 12 C 4 unit.…”

“…4′‐Amino‐benzo‐12‐crown‐4‐acrylamide (AB 12 C 4 ) was synthesized from B 12 C 4 (TCI) . N ‐isopropylacrylamide (NIPAM, Sigma‐Aldrich), α‐CD (Xiya Reagent), and β‐CD (Sinopharm Chemical Reagents) were recrystallized before use . N ‐(3‐dimethylaminopropyl)‐ N ′‐ethylcarbodiimide hydrochloride (EDC, TCI), N,N ′‐methylenebis acrylamide (MBA, Chengdu Kelong Chemical Reagents), ammonium persulfate (APS, Chengdu Kelong Chemical Reagents), acrylic acid (AAc, Chengdu Kelong Chemical Reagents), γ‐CD (Energy Chemical), and other chemicals were used as received.…”

“…To investigate the dynamic γ‐CD‐responsive behaviors, PNB‐30 and PNB‐20 microgels were dispersed in water separately for plenty of time at 36 °C, and then a certain amount of γ‐CD aqueous solution at the concentration of 50 × 10 −3 m at the same temperature was added to adjust the total γ‐CD concentration to 4 × 10 −3 m . A hydrogel‐20 containing 20 mol% B 12 C 4 units, just the same as the chemical composition of PNB‐20 microgels, was also investigated as a control sample …”

“…First, poly( N ‐isopropylacrylamide‐ co ‐acrylic acid) (PNA) microgels are synthesized by precipitation copolymerization, and then the microgels are further modified by benzo‐12‐crown‐4 (B 12 C 4 ) units via condensation reaction. The crown ether units of B 12 C 4 receptors selectively conjugate γ‐CD molecules . By γ‐CD molecular adsorption to enhance the hydrophilicity of PNB microgels, the microgels exhibit a significant isothermal increase of the volume (Figure ).…”

High‐Performance and Low Migration One‐Component Thioxanthone Visible Light Photoinitiators

“…But this method still could not get rid of unused photoinitiators and the species transferring from them. Polymerizable photoinitiators [3][4][5][6] with active polymerizable groups in the molecules could Q. Wu et al…”