Citation: Wen-tao Hu, Hua Yang, He Cheng, Hai-qing Hu. Morphology Evolution of Polystyrene-core/Poly(N-isopropylacrylamide)-shell Microgel Synthesized by One-pot Polymerization[J]. Chinese Journal of Polymer Science, ;2017, 35(9): 1156-1164. doi: 10.1007/s10118-017-1969-7 shu

Morphology Evolution of Polystyrene-core/Poly(N-isopropylacrylamide)-shell Microgel Synthesized by One-pot Polymerization

Wen-tao Hu ^a ,
Hua Yang ^b,c ,
He Cheng ^b,c,, ,
Hai-qing Hu ^a,,

a.
Key Laboratory of Rubber-Plastics, Ministry of Education/Shandong Provincial Key Laboratory of Rubber-Plastics, School of Polymer Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China
b.
China Spallation Neutron Source(CSNS), Institute of High Energy Physics(IHEP), Chinese Academy of Sciences(CAS), Dongguan 523803, China
c.
Dongguan Institute of Neutron Science(DINS), Dongguan 523808, China

Corresponding author: He Cheng, chenghe@ihep.ac.cn Hai-qing Hu, hhq@qust.edu.cn
Received Date: 2 March 2017
Revised Date: 29 March 2017
Accepted Date: 20 April 2017

Fund Project: This work was financially supported by the National Natural Science Foundation of China 21474119This work was financially supported by the National Natural Science Foundation of China 21674020

One-pot polymerization with macroinitiator is supposed to be a robust, facile way to synthesize well-defined core-shell nanoparticles with fixed shell thickness. To testify this, we investigated the temperature-depending morphology evolution of polystyrene (PS) core/poly(N-isopropylacrylamide) (PNIPAM) shell microgel synthesized by one-pot polymerization with PNIPAM-RAFT as macroinitiator in dimethylformamide (DMF) by transmission electron microscopy (TEM), dynamic/static light scattering (DLS/SLS) and small angle neutron scattering (SANS). It is revealed that the microgel has a core-shell structure, i.e., the core is made of pure PS, but the shell is composed of both PNIPAM-RAFT macroinitiator and crosslinked PS. In fact, there are 92.0 wt% D₂O, 6.7 wt% PNIPAM and 1.3 wt% PS in the shell in its aqueous dispersion at 21℃; therefore, its shell thickness is much larger than the extended chain length of the macroinitiator as revealed by both SANS and DLS observations. Competitive growth of styrene, divinylbenzene and PNIPAM macroinitiator as well as possible chain transfer from amine proton of PNIPAM side chain may lead to the larger shell thickness, compared with the extended chain length of the macroinitiator. Our work can shed light on the real morphology control in one-pot polymerization.
- One-pot,
- PS-core/PNIPAM-shell,
- TEM,
- DLS,
- SANS
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