摘要
The behavior of poly(ethylene glycol)-b-poly(butylene terephthalate) copol ymer has been investigated. The influences of the immersing time(in phosphate buffer solution of pH=7 4, at (37±1) ℃) on the sw elling ratio, the mass loss and the surface morphology of the copolymer film were examined. The copolymer is found to be degradable. The m icrospheres of PEG-b-PBT were prepared by a solvent extraction method using PVA as a stabilizer and characteristic of a sm ooth and spherical surface, sized about 1 133 μm. IR and XRD results reveal that Levonorgestrel crystalls are physically entrapped in the microspheres of the copolymer.
The behavior of poly(ethylene glycol)-b-poly(butylene terephthalate) copol ymer has been investigated. The influences of the immersing time(in phosphate buffer solution of pH=7 4, at (37±1) ℃) on the sw elling ratio, the mass loss and the surface morphology of the copolymer film were examined. The copolymer is found to be degradable. The m icrospheres of PEG-b-PBT were prepared by a solvent extraction method using PVA as a stabilizer and characteristic of a sm ooth and spherical surface, sized about 1 133 μm. IR and XRD results reveal that Levonorgestrel crystalls are physically entrapped in the microspheres of the copolymer.
出处
《应用化学》
CAS
CSCD
北大核心
2003年第3期293-295,共3页
Chinese Journal of Applied Chemistry
基金
国家"八六三"计划 ( 2 0 0 1AA2 16 0 77)资助项目
