摘要
Tri-block amphiphilic copolymers with hybrid architectures were synthesized by coupling linear （poly（ethylene） glycol）（PEG） and dendritic second-generation Fréchet-type poly（benzyl ether）（PBE） via the Williamson reaction （Gisotv,et al. Angew Chem,Int Ed Engl,1992,31:1200～1202）.Our experimental study shows that the powerful two-dimensional （）1H- （）13C heteronuclear multiple-quantum correlation （HMQC） and two-dimensional （）1H- （）13C heteronuclear multiple-bond correlation （HMBC） NMR techniques rather than the classical one-dimensional （）1H and （）13C-NMR methods can provide clear evidence to verify the formation of the tri-block copolymers.In our measurements HMQC and HMBC NMR techniques directly detected the signal of ether bonds bridged in-between PBE dendrons and PEG blocks,therefore,the formation of the block copolymers are evidently confirmed in molecular level.This work also provides a general method to exactly confirm the formation of block copolymers.
Tri-block amphiphilic copolymers with hybrid architectures were synthesized by coupling linear poly(ethylene glycol) ( PEG) and dendritic second-generation Frechet-type poly ( benzyl ether) (PBE) via the Williamson reaction (Gisotv, et al. Angew Chem, Int Ed Engl, 1992, 31: 1200similar to1202). Our experimental study shows that the powerful two-dimensional H-1-C-13 heteronuclear multiple-quantum correlation ( HMQC) and two-dimensional H-1-C-13 heteronuclear multiple-bond correlation (HMBC) NMR techniques rather than the classical one-dimensional H-1 and C-13-NMR methods can provide clear evidence to verify the formation of the tri-block copolymers. In our measurements HMQC and HMBC NMR techniques directly detected the signal of ether bonds bridged in-between PBE dendrons and PEG blocks, therefore, the formation of the block copolymers are evidently confirmed in molecular level. This work also provides a general method to exactly confirm the formation of block copolymers.
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2004年第6期908-912,共5页
Acta Polymerica Sinica
基金
国家自然科学基金资助项目 (基金号 2 0 2 44 0 0 4
2 0 2 740 2 0 )
