N-异丙基丙烯酰胺/丙烯酸十八酯共聚物水溶液胶束及相分离行为研究

合成了N异丙基丙烯酰胺(NIPAM)和丙烯酸十八酯(ODA)的共聚物.利用荧光探针和滴重法研究了NIPAMODA共聚物在水溶液中的胶束形成过程.同时还利用荧光探针法研究了共聚物水溶液在温度升高时出现的LCST(LowerCriticalSolutionTemperature)现象,表明该高分子在温度升高时存在着相分离现象.利用LB技术测量共聚物不溶单分子膜的PA曲线,发现随着温度升高共聚物的单分子膜越来越凝聚的反常现象,这从另一个侧面证实了共聚物NIPAMODA的相分离行为,并对此现象作了讨论.

A Study on the Micelle and Phase Separation Behavior of NIPAM-ODA Copolymer in Aqueous Solution

To study the micele and phase separation behavior of amphiphilic copolymer in aqueous solution which is temperat ure-sensit ive, The copolymer of N-isopropylacrylamide(NIPAM)and octadecyl acrylate(ODA)was syn The sized.The micelle behavior of The copolymer was studied by drop weight method and fluorescence probe method respectively.Simultaneously, the phe-nomenon of LCST(Lower Crit ical Solution Temperat ure)of The copolymer in aqueous solution with The increase of temperat ure was also studied by using fluorescence probe met hod.results showed that, the phase separation came into being in The aqueous solution of the copolymer when temperature was increased to its LCST.The P-Aisotherms of The molecule of The copolymer as insoluble monolayer on water surface was obt ained by L-Bmet hod.The abnormal phenomenon that the monolayer of The copolymer got coacervat ive more and more with the increase of The tem-perat ure was observed.It further indicated that The phase separation of the copolymer occured from anoTher met hod.This phenomenon was also discussed in detail.