@article{oai:kitami-it.repo.nii.ac.jp:00007919,
 author = {Watanabe, Shinji and Wakino, Akira and Namikoshi, Takeshi and Murata, Miki},
 issue = {8},
 journal = {High Performance Polymers},
 month = {Dec},
 note = {Polycondensations of nylon-salt-type monomers composed with diethyl pyromellitate and aliphatic diamines with various methylene lengths were performed at 130 °C in ethylene glycol to afford flower-like particles. Before the polycondensation, the salt monomer solution was homogenous. As the polycondensation proceeded, the solution became turbid and polyimide particles grew to around 15 μm in 8 h. Further polycondensation broke the particles into small pieces. The polyimide particles showed the distinctive odd-even effect of the methylene chain of diamine in both inherent viscosity and crystallinity. The polyimide particles using diamine with even-methylene length had higher crystallinity and lower inherent viscosity than those using diamine with odd-methylene length.},
 pages = {710--716},
 title = {Preparation of aliphatic polypyromellitimide particles by polycondensation of nylon-salt-type monomers derived from aliphatic diamines with diethyl pyromellitate in ethylene glycol},
 volume = {24},
 year = {2012}
}