Synthesis and characterization of high temperature resistant thermal expansion microsopheres with P(acrylonitrile/methacrylic acid/N,N-dimethylacrylamide/n-butylacrylate) shell

• DOI: 10.1007/s42452-019-0976-4
• Publication Date: 2019-07-26T17:02:32Z
• Authors: Jing Zhang; Yifan Zhou; Baoyu Huang; Song Lv; Xu Ma; Jijun Tang
• Keywords: 01 natural sciences; 0104 chemical sciences

High temperature resistant microspheres were prepared via Pickering suspension polymerization. Acrylonitrile (AN), methacrylic acid (MAA) and N,N-dimethylacrylamide (DMAA) were used as monomers, and n-butylacrylate (BA) was used as modified monomer to improve the expansion properties of the microspheres. Morphology of the microspheres was characterized by scanning electron microscopy (SEM) and polarizing optical microscope (POM) respectively. The average diameter of the prepared microspheres was 51.9 μm, and the maximum expansion volume was 4 times of the original volume. The expansion performance and blowing agent content of the microspheres were characterized by thermal mechanical analysis (TMA) and thermogravimetric analysis (TGA) respectively. The onset expansion temperature of the microspheres was 159.5 °C, the maximum expansion temperature was 213.9 °C, and the encapsulation content of the blowing agent was 14.62%. Fourier transform infrared (FTIR) showed that the adjacent chains of AN and MAA form imide ring structure during the thermal expansion process of the microspheres.