Hierarchical Porous Polyamide 6 by Solution Foaming: Synthesis, Characterization and Properties

Polymers - Tập 10 Số 12 - Trang 1310
Liang Wang1, Yu-Ke Wu2,1, Fangfang Ai2,1, Jie Fan2,1, Zhaopeng Xia1, Yong Liu1
1School of Textiles, Tianjin Polytechnic University, No.399 Binshui West Road, Xiqing District, Tianjin 300387, China
2Key Laboratory of Advanced Textiles Composites of Ministry of Education, Tianjin Polytechnic University, Binshui West Road 399, Tianjin 300387, China

Tóm tắt

Porous polym er materials have received great interest in both academic and industrial fields due to their wide range of applications. In this work, a porous polyamide 6 (PA6) material was prepared by a facile solution foaming strategy. In this approach, a sodium carbonate (SC) aqueous solution acted as the foaming agent that reacted with formic acid (FA), generating CO2 and causing phase separation of polyamide (PA). The influence of the PA/FA solution concentration and Na2CO3 concentration on the microstructures and physical properties of prepared PA foams were investigated, respectively. PA foams showed a hierarchical porous structure along the foaming direction. The mean pore dimension ranged from hundreds of nanometers to several microns. Low amounts of sodium salt generated from a neutralization reaction played an important role of heterogeneous nucleation, which increased the crystalline degree of PA foams. The porous PA materials exhibited low thermal conductivity, high crystallinity and good mechanical properties. The novel strategy in this work could produce PA foams on a large scale for potential engineering applications.

Từ khóa


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