Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs o...Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs of the polymer were studied.The results show that the polymer thus obtained has good temperature sensitivity and uniformity within certain radiation dosage range(1.4～4kGy) and dose rate range (2～14Gy/min).展开更多
The thermosensitive poly （ N-isopropylacrylamide ） （PNIPAAm） and poly （N-isopropylacrylamide-co-acrylamide） [ poly （NIPAAm-co-AAm） ] hydrogels with different acrylamide molar percentage are prepared by radiati...The thermosensitive poly （ N-isopropylacrylamide ） （PNIPAAm） and poly （N-isopropylacrylamide-co-acrylamide） [ poly （NIPAAm-co-AAm） ] hydrogels with different acrylamide molar percentage are prepared by radiation polymerization using Co^60 γ-ray. Their swelling equilibrium data in the media of deionized water, NaCl aqueous solutions and different pH buffer solutions are determined. It appears that lower critical solution temperature （LCST） of the hydrogels will drop with the increase of ionic strength and increase with the rising of acrylamide content, A semi-empirical formula is set up with the experimental results. Moreover, it also indicates that this copolymer is pH-sensitive, which is similar to the homopolymer of PNIPAAm.展开更多
文摘Temperature sensitive poly(N vinylcaprolactam) was prepared by γ radiation polymerization.The effects of radiation dosage,radiation dose rate and monomer concentration on polymerization and the LCST characterisitcs of the polymer were studied.The results show that the polymer thus obtained has good temperature sensitivity and uniformity within certain radiation dosage range(1.4～4kGy) and dose rate range (2～14Gy/min).
基金Project Supported by Science Foundation of Shanghai MunicipalCommission of Science and Technology (Grant No .02DJ14030)
文摘The thermosensitive poly （ N-isopropylacrylamide ） （PNIPAAm） and poly （N-isopropylacrylamide-co-acrylamide） [ poly （NIPAAm-co-AAm） ] hydrogels with different acrylamide molar percentage are prepared by radiation polymerization using Co^60 γ-ray. Their swelling equilibrium data in the media of deionized water, NaCl aqueous solutions and different pH buffer solutions are determined. It appears that lower critical solution temperature （LCST） of the hydrogels will drop with the increase of ionic strength and increase with the rising of acrylamide content, A semi-empirical formula is set up with the experimental results. Moreover, it also indicates that this copolymer is pH-sensitive, which is similar to the homopolymer of PNIPAAm.
