Preparation and physical properties of phthalonitrile composite foam filled with hollow glass microspheresPing Yuan, Yong Qiu, Yuhong Huang, Juying Wu, Jinghui Fan, Kai Zhang, Ren He and Tao XingE3S Web Conf., 213 (2020) 02034DOI: https://doi.org/10.1051/e3sconf/202021302034