The reactions of dioxanyl and cyclohexylradicals with 2- and 3-X-pyridines (X = CN, COMe, CO2Me) give a single substitution product deriving by addition at the 5- and 6-positions respectively; with 4-X-pyridines substitution occurs preferentially at the 3-position. If the reactions are carried out with protonated pyridines other positional isomers are obtained. From the synthetic point of view the
POLYAMIDE-IMIDE BLOCK COPOLYMER, METHOD FOR PREPARING SAME, AND POLYAMIDE-IMIDE FILM COMPRISING SAME
申请人:LG Chem, Ltd.
公开号:EP3910003A1
公开(公告)日:2021-11-17
The polyamide-imide block copolymer according to the present invention makes it possible to provide a polyamide-imide film having excellent thermal stability and chemical resistance and, at the same time, having excellent mechanical properties.