摘要
New thermoplastic norbornene polymers containing ester groups were prepared byvinylic polymerization of norbornene-carboxylic acid esters by Pd(Ⅱ)-based catalysts. Themonomers were obtained by Diels-Alder reaction of cyclopentadiene with acrylic acid esters(methyl and butyl) as mixtures of endo/exo (ratio 40/60)-isomers and were converted topolymers in 60%～70% conversion. The endo-isomer was less reactive than the exo-isomer.To obtain higher molecular weight the more reactive pure exo-isomer was prepared andpolymerized with the Pd (Ⅱ)-catalysts, tetrakis (acetonitrile) Pd (Ⅱ) bis (tetrafluoroborate)and (η3-allyl)Pd(Ⅱ)SbF6, in high conversion. These polymers showed high glass transitiontemperatures, high transparency and good solubility in common solvents.
New thermoplastic norbornene polymers containing ester groups were prepared by vinylic polymerization of norbornene-carboxylic acid esters by Pd(Ⅱ)-based catalysts. The monomers were obtained by Diels-Alder reaction of cyclopentadiene with acrylic acid esters(methyl and butyl) as mixtures of endo/exo (ratio 40/60)-isomers and were converted to polymers in 60%~70% conversion. The endo- isomer was less reactive than the exo -isomer. To obtain higher molecular weight the more reactive pure exo- isomer was prepared and polymerized with the Pd(Ⅱ)-catalysts, tetrakis(acetonitrile)Pd(Ⅱ) bis(tetrafluoroborate) and ( η 3-allyl)Pd(Ⅱ)SbF 6, in high conversion. These polymers showed high glass transition temperatures, high transparency and good solubility in common solvents.
出处
《应用化学》
CAS
CSCD
北大核心
2001年第5期296-300,共5页
Chinese Journal of Applied Chemistry
