In our previous work, the Janus composite particles of urushiol-titanium chelate polymer/PS have been synthesized successfully , Herein, the tributyl borate was adsorbed on the surface of the sulfonated PS (SPS) microspheres.
Divinylbenzene (DVB, 80%), tributyl borate, and dimethylbenzene were purchased from Aladdin reagent Co., Ltd., China.
Then the SPS particles were immersed in large amount of tributyl borate/ethanol (1:1 vol/vol) mixture for more than 12 hr to allow a saturated absorption of tributyl borate within the sulfonated gel shell.
Then PUB was coated on the surface of SPS by the approach of transesterification between the urushiol and tributyl borate which reacted at 70[degrees]C of water bath for 24 hr.
After the outermost shells of SPS microspheres were modified by tributyl borate to form gel layers which reacted with the urushiol, the PS@PUB core-shell composite microspheres were synthesized (Fig.