Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (11): 20220381.doi: 10.7503/cjcu20220381

• Polymer Chemistry • Previous Articles     Next Articles

Synthesis and Properties of Polypeptoid Hydrogels Containing Sulfonium Groups

YAN Shuting, YAO Yuan, TAO Xinfeng(), LIN Shaoliang()   

  1. Shanghai Key Laboratory of Advanced Polymeric Materials,School of Materials Science and Engineering,East China University of Science and Technology,Shanghai 200237,China
  • Received:2022-05-29 Online:2022-11-10 Published:2022-08-20
  • Contact: TAO Xinfeng,LIN Shaoliang E-mail:taoxinfeng@ecust.edu.cn;slin@ecust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21901073);the Natural Science Foundation of Shanghai, China(19ZR1412100);the “Chenguang Program” of Shanghai Education Development Foundation and Shanghai Municipal Education Commission, China(18CG32)

Abstract:

Triblock copolypeptoid poly(N-allylglycine)-b-polysarcosine-b-poly(N-allylglycine)(PASA) was prepared by primary amine-initiated controlled ring-opening polymerization of sarcosine N-thiocarboxyanhydride (Sar-NTA) and N-allylglycine N-thiocarboxyanhydride(NAG-NTA). Followed by cross-linking via thiol-ene click reaction between the allyl groups on the PASA side chains and thiols groups on 3,6-dioxa-1,8-octanedithiol, polypeptoid hydrogels(HG) with different molar fraction of sarcosine(Sar), HG-Sar49% and HG-Sar64%, were obtained. A large amount of thioether groups were formed through the thiol-ene click reaction, which could further react with epoxide compounds to generate sulfonium groups on the network of PASA hydrogels. Thus, sulfonium- containing polypeptoid hydrogels(S+HG) with intrinsic antibacterial properties were successfully prepared. S+HG showed fast and excellent water absorption ability, which reached the water absorption balance within 1 min and had a saturation swelling rate up to 2024%. S+HG was composed of regular continuous sponge-like structures, and could withstand certain external stresses such as shearing, friction and extrusion. S+HG exhibited strong broad-spectrum antibacterial ability, and the antibacterial rates against gram-negative Escherichia coliE. coli) and gram-positive Staphylococcus aureus(S. aureus) were over 99.99%.

Key words: Polypeptoid, N-Thiocarboxyanhydride, Hydrogel, Antibacterial ability, Sulfonium

CLC Number: 

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