A method for regulating the maximum critical solubility temperature of zwitterionic polymers through terminal group modification

A zwitterionic polymer technology, which is applied in the field of regulating the maximum critical mutual solubility temperature of zwitterionic polymer propanesulfonate), can solve the problems of difficulty in improving UCST and single responsiveness of zwitterionic polymers, and achieves improving UCST and broadening applications. Foreground, simple effect of aggregation method
CN111004344BActive Publication Date: 2021-07-20BEIJING UNIV OF CHEM TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
BEIJING UNIV OF CHEM TECH
Publication Date
2021-07-20

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Abstract

The invention discloses a method for adjusting and controlling the maximum critical mutual solubility temperature of zwitterionic polymers through terminal group modification. Zwitterionic polymers are obtained by polymerizing functional RAFT reagents. The UCST of carboxyl-terminated polymers can be regulated by pH; the ester-terminated polymers The UCST has increased substantially. The zwitterionic monomer is called 3-(2-methacryloyloxyethyl dimethylamino) propanesulfonate (DMAPS), and its polymer is called PDMAPS, and the molar ratio of DMAPS and RAFT reagent in the polymer system is n: 1 (n=80-500); ECT is carboxyl-terminated RAFT reagent 4-cyano-4-(((ethylthio)carbonyl)thio)pentanoic acid. This end group modification method solves the problem that the zwitterionic polymer has a single response and the UCST is difficult to improve, and is expected to be applied in fields that are sensitive to pH environments such as water treatment and drug carriers.
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Description

technical field

[0001] The present invention relates to a method for controlling the maximum critical solubility temperature (UCST) of zwitterionic polymers (poly 3-(2-methacryloyloxyethyldimethylamino)propanesulfonate (PDMAPS)) by modifying terminal groups method. More specifically, the present invention relates to the use of the carboxyl-terminated RAFT agent 4-cyano-4-(((ethylthio)thiocarbonyl)thio)pentanoic acid (ECT) and the ester-terminated RAFT agent 4-cyano- Methyl 4-(((ethylthio)thiocarbonyl)thio)pentanoate (C 1 -ECT), ethyl 4-cyano-4-(((ethylthio)thiocarbonyl)thio)pentanoate (C 2 -ECT), 4-cyano-4-(((ethylthio)thiocarbonyl)thio)hexyl pentanoate (C 6 -ECT) and 4-cyano-4-(((ethylthio)thiocarbonyl)thio)phenethyl valerate (C p -ECT). Polymerized to obtain sulfobetaine type zwitterionic polymers (PDMAPS), carboxyl-terminated polymers have UCST that can be adjusted by pH, and UCST increases with the decrease of pH; at the same molecular weight, terminal ester group mod...

Claims

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