The polyphosphates with pendent chloroethyloxy group were synthesized by using PPL and PPL immobilized on silica nanoparticles as catalyst, respectively. The results indicated that the reaction conditions such as enzy...The polyphosphates with pendent chloroethyloxy group were synthesized by using PPL and PPL immobilized on silica nanoparticles as catalyst, respectively. The results indicated that the reaction conditions such as enzyme concentration, temperature and reaction time exerted a considerable influence on the molecular weight and yield of the polyphosphates and in the case of using immobilized PPL as catalyst, relatively higher molecular weight( M n) could be obtained. Recycle use of the immobilized PPL was also preliminarily investigated.展开更多
Mono-hydroxyl terminated polycaprolactone(PCL) was prepared by Novozyme 435 catalyzed ring-opening polymerization(ROP) of ε-caprolactone(ε-CL) initiated by methanol,and subsequently converted to bromine ended PCL by...Mono-hydroxyl terminated polycaprolactone(PCL) was prepared by Novozyme 435 catalyzed ring-opening polymerization(ROP) of ε-caprolactone(ε-CL) initiated by methanol,and subsequently converted to bromine ended PCL by the esterification of the resulting macromolecules with α-bromopropionyl bromide.The macroinitiators containing α-bromoester group were employed in the atom transfer radical polymerization(ATRP) of glycidyl methacrylate(GMA) with CuCl/2,2-bipyridine(bpy) as the catalyst system to obtain amphiphilic diblock copolymer PCL-b-PGMA.展开更多
文摘The polyphosphates with pendent chloroethyloxy group were synthesized by using PPL and PPL immobilized on silica nanoparticles as catalyst, respectively. The results indicated that the reaction conditions such as enzyme concentration, temperature and reaction time exerted a considerable influence on the molecular weight and yield of the polyphosphates and in the case of using immobilized PPL as catalyst, relatively higher molecular weight( M n) could be obtained. Recycle use of the immobilized PPL was also preliminarily investigated.
文摘Mono-hydroxyl terminated polycaprolactone(PCL) was prepared by Novozyme 435 catalyzed ring-opening polymerization(ROP) of ε-caprolactone(ε-CL) initiated by methanol,and subsequently converted to bromine ended PCL by the esterification of the resulting macromolecules with α-bromopropionyl bromide.The macroinitiators containing α-bromoester group were employed in the atom transfer radical polymerization(ATRP) of glycidyl methacrylate(GMA) with CuCl/2,2-bipyridine(bpy) as the catalyst system to obtain amphiphilic diblock copolymer PCL-b-PGMA.
