氢键局域协同驱动的水溶性高分子温敏特性.pdfVIP

Abstract Thermo-sensitive water soluble polymers were extensively applied in biomedical, intelligent materials and other fields. Recent studies demonstrated that their thermal response behaviors may be effectively regulated by varing hydrogen bonding. However, in-depth understanding the thermal responsive mechanism of thermo-sensitive polymers is still challenging. In this thesis, we synthesized a series of PNMEP , P(NMEP -ran-FPHPMA ), PNMEP -b- 70 65 5 32 P(NMEP -ran-FPHPMA ), PNMEP -b-P(NMEP -ran-FPHPMA ) and PNMEP -b- 34 5 57 7 6 63 PFPHPMA7 via visible light activating RAFT polymerization at 25 oC, in which N-(2-meth acrylatoethyl) pyrrolidone (NMEP) units acted as basic water-soluble units, and small amount of 3-(4-formylphenyl)-2-hydroxylbutylmethacrylate (FPHPMA) units were incorporated into polymer chains as hydrogen bonding effectors. The thermal response behaviors were investigated by laser light scattering (LLS) and temperature-variable 1H NMR. The results demonstrated that introducing small amount of FPHPMA effectors in polymer chains led to the significant decrease of the cloud points. More importantly, varying the distribution from P(NMEP -ran-FPHPMA ) to PNMEP -b-P(NMEP -ran-FPHPMA ) 65 5 32 34 5 led to ca. 8 oC lower cloud point. However, varying from PNMEP32-b-P(NMEP34-ran- FPHPMA ) to PNMEP -b-P(NMEP -ran-FPHPMA ) gave rise to ca. 12