AI Article Synopsis
- Solution 1H NMR techniques revealed that urea selectively interacts with the PEO blocks of PEO-PPO-PEO triblock copolymers, with interaction sites remaining consistent regardless of temperature changes.
- This interaction enhances the hydration of the block copolymers and stabilizes the gauche conformation of the PPO chain, affecting their self-assembly in solution.
- Urea raises the critical micellization temperature (CMT) of these copolymers, with a more significant effect observed in those with higher PEO content and a reduced impact in copolymers with more PPO segments.
Article Abstract
Solution 1H NMR techniques were used to characterize the interaction of urea with poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) (PEO-PPO-PEO) triblock copolymers. The urea was established to interact selectively with the PEO blocks of the block copolymer, and the interaction sites were found not to change with increasing temperature. Such interactions influence the self-assembly properties of the block copolymer in solution by increasing the hydration of the block copolymers and stabilizing the gauche conformation of the PPO chain. Therefore, urea increases the critical micellization temperature (CMT) values of PEO-PPO-PEO copolymers, and the effect of urea on the CMT is more pronounced for copolymers with higher PEO contents and lower for those with increased contents of PPO segments.
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