2,2'-Bis (4H-3,1-benaoxazin-4-one) (BBON) has been proved to be an effective chain extender for poly (ethylene terephthalate) (PET). In order to study the reaction mechanism and kinetics of chain-extending reactio...2,2'-Bis (4H-3,1-benaoxazin-4-one) (BBON) has been proved to be an effective chain extender for poly (ethylene terephthalate) (PET). In order to study the reaction mechanism and kinetics of chain-extending reaction, beta-bishydroxyethylene terephthalate (BHET) was selected as model compound. The NMR data, IR spectra and number average molecular weight (<(M)over bar (n)>) of the products obtained from the reaction of BBON and BHET verify that BBON is a hydroxyl-reactive extender. The mechanism was discussed. Kinetics data indicate that extending reaction is a second order reaction, and BBON has high reactivity. The activation energy (E(a)) was measured.展开更多
文摘2,2'-Bis (4H-3,1-benaoxazin-4-one) (BBON) has been proved to be an effective chain extender for poly (ethylene terephthalate) (PET). In order to study the reaction mechanism and kinetics of chain-extending reaction, beta-bishydroxyethylene terephthalate (BHET) was selected as model compound. The NMR data, IR spectra and number average molecular weight (<(M)over bar (n)>) of the products obtained from the reaction of BBON and BHET verify that BBON is a hydroxyl-reactive extender. The mechanism was discussed. Kinetics data indicate that extending reaction is a second order reaction, and BBON has high reactivity. The activation energy (E(a)) was measured.
