Self-assembly of multiple stimulus response copolymer by ATRP in different media

ABSTRACT

The novel pH and thermo-sensitive amphiphilic triblock copolymer poly(methyl methacrylate)-block-poly(N-isopropylacrylamide)-block-poly[N,N-(dimethylamino) ethyl methacrylate] (PMMA-b-PNIPAM-b-PDMAEMA) was synthesized by ATRP. We have prepared the AB amphiphilic copolymer (PMMA-b-PNIPAM) and ABC amphiphilic triblock copolymer (PMMA-b-PNIPAM-b-PDMAEMA) of expected molecular mass. It was characterized by GPC,¹HNMR and FT-IR spectroscopy. The AB amphiphilic copolymer ability of temperature response and the morphology of self-assembly micelles different in toluene, THF, and DMF. ABC amphiphilic triblock copolymer self-assembled petal structure in alkaline aqueous solution, and lamellar structure in acidic aqueous solution. Moreover, the transmittance of micellar solution changes with the increase of temperature; these changes reflect the pH and thermo-sensitivity of the block copolymer. The micelles behavior and morphology of the system were studied by transmission electron microscopy (TEM) and dynamic light scattering (DLS).

KEYWORDS:

• Block copolymer
• temperature sensitive
• pH sensitive
• atrp
• self-assembly

Acknowledgments

The authors gratefully acknowledge the fund from the National Natural Science Foundation of China, the Science and Technology Department of Heilongjiang Province and the Qiqihar Science and Technology Bureau, and the help of the Key Laboratory of Polymeric Composite Materials of Qiqihar University in testing.

Disclosure statement

There are no conflicts to declare.

Author Contributions

Conceptualization, Y.W. and X.Z.; Data curation, X.Z. and S.D.; Formal analysis, X.Z.; investigation, L.Z. and T.L.; resources, Y.W.; writing—original draft preparation, X.Z.; writing—review and editing, Y.W., X.Z.,S.D.,C.W.,L.L.

Additional information

Funding

This research was funded by the Fundamental Research Funds in Heilongjiang Provincial Universities [YSTSXK201860] and the Graduate Innovation Research Project of Qiqihar University [YJSCX2019059];Qiqihar University [YJSCX2019059];