Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2968.doi: 10.7503/cjcu20210266

• Polymer Chemistry • Previous Articles     Next Articles

Ring-opening Polymerization of Cyclic Esters Using Recyclable Polystyrene Supported Urea-Base Binary Catalyst

MA Yukun, JIN Hui, REN Chuanli(), LI Zhibo()   

  1. College of Chemical Engineering,College of Polymer Science and Engineering,Qingdao University of Science and Technology,Qingdao 266042,China
  • Received:2021-04-20 Online:2021-09-10 Published:2021-09-08
  • Contact: LI Zhibo E-mail:chuanli@iccas.ac.cn;zbli@qust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21704049);the Talent Fund of Shandong Collaborative Innovation Center of ECO?Chemical Engineering, China(XTCXQN08)

Abstract:

To solve the catalyst residual problem, a promising strategy is to immobilize active catalyst on the surface of polymer microspheres to make heterogeneous catalyst. Herein, a metal-free approach to the ring-opening polymerization of lactones using recyclable polystyrene supported urea-potassium methoxide binary catalyst system is described. The new heterogeneous catalysts, polystyrene(PS)-supported cyclohexyl urea (PS-U1) and polystyrene-supported 4-(trifluoromethye) phenyl urea(PS-U2), were prepared by reactions of amine-functionalized PS microspheres with cyclohexyl isocyanate and 4-(trifluoromethyl)phenyl isocyanate, respectively. It was found that PS-U-potassium methoxide catalytic system exhibited high catalytic activity for ring-opening polymerization(ROP) of lactones, including ε-caprolactone(ε-CL), δ-valerolactone(δ-VL) and rac-lactide(rac-LA). In addition, the heterogeneous PS-U could be easily separated via simple filtration and recycled. It is worth noting that the recycled PS-U catalyst could be reused without significant decrease of catalytic activity.

Key words: Heterogeneous catalyst, Urea, Ring-opening polymerization, Polyester

CLC Number: 

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