Preparation of porous polyimide microspheres by thermal degradation of block copolymers--颗粒学报PARTICUOLOGY

Wang, L., Lu, J., Liu, M., Lin, L., & Li, J. (2014). Preparation of porous polyimide microspheres by thermal degradation of block copolymers. Particuology, 14, 63–70. https://doi.org/10.1016/j.partic.2013.06.005

Preparation of porous polyimide microspheres by thermal degradation of block copolymers

Li Wang, Jianjun Lu^*, Miaoqing Liu, Li Lin, Jingjing Li

Key Laboratory of Coal Science and Technology, Taiyuan University of Technology, Taiyuan 030024, China

10.1016/j.partic.2013.06.005

Volume 14, June 2014, Pages 63-70

Received 6 March 2013, Revised 20 May 2013, Accepted 6 June 2013, Available online 15 August 2013.

E-mail: lujianjun@tyut.edu.cn

Highlights

• Porous polyimide microspheres were prepared by thermal degradation from triblock copolymers.

• Pore size was determined by J2070 content and pressure during degradation.

• Desired macropores were obtained when degrading copolymer with 30 wt% J2070 at 260 °C and 710 mmHg.

Abstract

A new preparation method has been developed for thermally stable porous polyimide microspheres. Porous polyimide microspheres were prepared using triblock copolymers that consisted of a thermally stable polyimide derived from pyromellitic dianhydride/4,4′-oxydianiline as the continuous phase and a thermally labile polyether as the dispersed phase. Spheres of copolymers were generated in a non-aqueous emulsion and then gradually heated to complete the imidization to form a microphase-separated structure. Subsequently, thermal treatment at a slightly reduced pressure removed the labile blocks and produced pores. Under suitable decomposition conditions, the pore size of the porous polyimide was in the range of 200–400 nm.

Graphical abstract

Keywords

Block copolymer sphere; Microphase separation; Polyimide; Porous microsphere; Porous polymer

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