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A Dynamic Monitoring Method of Hydrophilic and Hydrophobic Transitions in Environmentally Responsive Polymers by Low Field NMR Technique

An environmental responsive, low-field nuclear magnetic technology, applied in the direction of analysis using nuclear magnetic resonance, etc., can solve problems such as the inability to study the interaction of water molecules, the inability to study the dynamic behavior of polymer dehydration, and the inability to dynamically monitor

Inactive Publication Date: 2016-08-17
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can directly obtain the hydrophilic-hydrophobic transition temperature point of the polymer, but the transition process can only be observed from the change of light transmittance, and cannot be dynamically monitored from the molecular level.
[0004] Document 2 "Feng Wang, Akamol Klaikherd, and S. Thayumanavan. Temperature Sensitivity Trends and Multi-Stimuli Sensitive Behavior in Amphiphilic Oligomers. J. Am. Chem. Soc. 2011, 133, 13496–13503" discloses a method using circular dichroism method to study the hydrophilic-hydrophobic transition of amphiphilic oligomers, but still unable to study how water molecules interact with polymers during phase separation
[0005] Document 3 "Wei Tian, ​​Xiao-ying Wei, Yu-yang Liu and Xiao-dong Fan. A branching pointthermo and pH dual-responsive hyperbranched polymer based on poly(N-vinylcaprolactam) and poly(N,N-diethyl aminoethyl methacrylate) "Disclosed a method for studying the environmental responsiveness of hyperbranched polymers using UV spectrophotometer and dynamic light scattering, but the process of hydrophilic-hydrophobic transition can only be observed indirectly through the change of light transmittance and particle size, but cannot The dynamic behavior of polymer dehydration is studied from the mechanism of interaction between water molecules and polymers

Method used

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  • A Dynamic Monitoring Method of Hydrophilic and Hydrophobic Transitions in Environmentally Responsive Polymers by Low Field NMR Technique
  • A Dynamic Monitoring Method of Hydrophilic and Hydrophobic Transitions in Environmentally Responsive Polymers by Low Field NMR Technique

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Embodiment 1

[0026] Example 1: Take 5 mg of a pre-synthesized poly(N-isopropylacrylamide) sample, prepare a 1 mg / mL aqueous solution, and take a pure aqueous solution of the same quality as a reference. Add 25 mg of copper sulfate to poly(N-isopropylacrylamide) and pure aqueous solution respectively. Take out 2mL of the above two solutions and put them into 10mm caliber color mother bottle, the sample height is about 2cm; then put the two color mother bottles into the test pool of nuclear magnetic resonance instrument with temperature changing device respectively. The NMR signals of poly(N-isopropylacrylamide) aqueous solution and pure aqueous solution at different temperatures were collected by low-field NMR analysis software. The NMR signal is fitted by a single exponential model to calculate the t corresponding to different temperature points 1 . The relaxation time spectra of poly(N-isopropylacrylamide) aqueous solution and pure aqueous solution were made respectively by using the co...

Embodiment 2

[0027] Example 2: Take 5 mg of a pre-synthesized poly(N-vinylcaprolactam) sample, prepare a 1 mg / mL aqueous solution, and take a pure aqueous solution of the same quality as a reference. 25 mg of copper sulfate were added to poly(N-vinylcaprolactam) and pure aqueous solution respectively. Take out 2mL of the above two solutions and put them into 10mm caliber color mother bottles, the sample height is about 2cm; then put the two color master bottles into the test pool of the nuclear magnetic resonance instrument with a temperature changing device. The NMR signals of poly(N-vinylcaprolactam) aqueous solution and pure aqueous solution at different temperatures were collected by low-field NMR analysis software. The NMR signal is fitted by a single exponential model to calculate the t corresponding to different temperature points 1 . The relaxation time spectra of poly(N-vinylcaprolactamamine) aqueous solution and pure aqueous solution were made respectively by using the correspo...

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Abstract

The present invention proposes a method for dynamic monitoring of environment-responsive macromolecule hydrophilic-hydrophobic transition by low-field nuclear magnetic technology. Low-field magnetic resonance technology can effectively characterize the binding ability of water molecules and macromolecules through the relaxation time of water molecules (affinity and hydrophobicity) water-based). The method involved in the present invention is a physical detection method, without adding other chemical reagents and complicated pretreatment to the test sample, and the detected sample can also be used for repeated detection to determine the repeatability and stability of the instrument, and other methods can also be used for detection , to achieve the effect of mutual verification of multiple methods.

Description

technical field [0001] The invention relates to a dynamic monitoring method for the hydrophilic-hydrophobic transition of environment-responsive macromolecules, in particular to a dynamic monitoring method for environmental-responsive macromolecular hydrophilic-hydrophobic transitions by low-field nuclear magnetic technology. Background technique [0002] At present, ultraviolet spectrophotometry, fluorescence spectrophotometry, dynamic light scattering and circular dichroism are mainly used for the hydrophilic-hydrophobic transition of environment-responsive polymers in aqueous solution. None of these methods can dynamically monitor and study the hydrophilic-hydrophobic transition from the perspective of the interaction between polymers and water molecules. [0003] Document 1 "Zhifeng Jia, Hao Chen, Xinyuan Zhu, Deyue Yan. Backbone-Thermoresponsive Hyperbranched Polyethers. J.AM.CHEM.SOC.2006, 128, 8144-8145" discloses a method for measuring the backbone response by using ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N24/08
Inventor 田威杨翼杨培强
Owner NORTHWESTERN POLYTECHNICAL UNIV