Citation: Can-yu Dou, Yan-jun Zhang, Chen Zhang, Yi-xian Wu. Synthesis and Properties of Polystyrene-g-Poly(2-ethyl-2-oxazoline) Amphiphilic Graft Copolymers[J]. Acta Polymerica Sinica, ;2019, 50(9): 939-948. doi: 10.11777/j.issn1000-3304.2019.19048 shu

Synthesis and Properties of Polystyrene-g-Poly(2-ethyl-2-oxazoline) Amphiphilic Graft Copolymers

State Key Laboratory of Chemical Resources Engineering, Beijing Laboratory of Biomedical Materials, Beijing University of Chemical Technology, Beijing 100029

Corresponding author: Yi-xian Wu, wuyx@mail.buct.edu.cn
Received Date: 11 March 2019
Revised Date: 28 March 2019
Available Online: 27 May 2019

Polyoxazolines have drawn much attention by researchers because of their hydrophilicity, good biocompatibility, non-toxicity. Chemical modification on polyoxazolines and their derivatives by grafting reaction with other synthetic polymer chains is one of the most important ways to improve the comprehensive properties of polyoxazoline materials. The novel amphiphilic polystyrene-g-poly(2-ethyl-2-oxazoline), PS-g-PEOX, graft copolymers were prepared through the combination of " grafting from” method and cationic ring-opening polymerization of 2-ethyl-2-oxazoline using the polystyrene bearing chloromethyl functional groups as the macroinitiator in the presence of activator, such as potassium iodide (KI), silver perchlorate (AgClO₄) or silver trifluoromethanesulfonate (AgCF₃SO₃). The chemical structure and composition of PS-g-PEOX graft copolymers were confirmed by Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (¹H-NMR). The results show that the novel amphiphilic PS-g-PEOX graft copolymers with various PEOX grafting contents ranging from 8% to 97% could be synthesized by changing the feed ratios of monomer and activator. The silver nanoparticle (5 – 10 nm) content in a range from 0.1% to 3.5% was uniformly dispersed in the PS-g-PEOX graft copolymer matrix. The microphase separation of amphiphilic PS-g-PEOX graft copolymer/silver nanoparticle nanocomposite was observed and the microscopic morphology was related to PEOX contents. The hydrophilicity of the amphiphilic PS-g-PEOX graft copolymers and water contact angle (WCA) increased with PEOX content. And the WCA of PS-g-PEOX graft copolymer film with 97% PEOX content is 24°. What’s more, amphiphilic PS-g-PEOX graft copolymers can form stable and uniform micro/nano micelles in water. The stable oil/water suspension can be produced by adding a small amount of PS-g-PEOX graft copolymer into the incompatible water/toluene mixed system. The topological structure which formed by introducing PEOX onto PS backbones is beneficial to improve the thermal stability of PEOX. The good hydrophilicity of PEOX branches in PS-g-PEOX graft copolymer does a favor to the anti-adsorption properties against bovine serum albumin. The graft copolymer/silver nanoparticle composites behave a good antibacterial activity against E. coli, which increased with the content of nano silver.
- Poly(2-ethyl-2-oxazoline),
- Amphiphilic,
- Graft copolymer,
- Cationic ring opening polymerization
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

Synthesis and Properties of Polystyrene-g-Poly(2-ethyl-2-oxazoline) Amphiphilic Graft Copolymers

南开大学师唯/华北电力大学（保定）刘景维：二维配位聚合物中有序的亲锂冠醚位点用于无枝晶锂沉积

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通讯作者: 陈斌, bchen63@163.com