论文部分内容阅读
采用ATRP技术合成具有不同聚合度的末端连接甲基丙烯酸全氟辛基乙酯(FMA)单元的聚甲基丙烯酸丁酯(PBMAm-ec-PFMAn).利用和频振动光谱(SFG)和表面张力测定技术研究了各种氟化聚合物溶液的气/液界面结构.发现PBMAm-ec-PFMAn甲苯溶液的表面活性及其气/液界面的结构与两种结构单元数密切相关.当PFMA聚合度(n)大约为4和6时,聚合物溶液的表面张力随着PBMA聚合度的增加从21增加到25mN/m(该值与PBMA均聚物溶液相同).SFG的研究结果表明PBMA段较长时溶液表面被PBMA所占据.PBMA段较短时,PFMA组分吸附在溶液表面,排列比较有序且紧密堆积.当PBMA末端只有1个FMA单元时,其甲苯溶液的表面张力随PBMA段长稍有增加(从22增加到23mN/m),其值介于21与25mN/m之间.研究表明当PBMA段较短时,可能聚合物中的氟化组分吸附在溶液表面,但其排列的有序性较差.随着PBMA聚合度的增加,氟化组分与PBMA组分可能同时占据在溶液表面,这时其表面张力大约为23mN/m.
ATRP was used to synthesize polybutylmethacrylate (PBMAm-ec-PFMAn) with different degree of polymerization and terminal-linked perfluorooctylethylmethacrylate (FMA) units.Using harmonic vibrational spectroscopy (SFG) and surface tension Determination of the gas-liquid interface structure of various fluorinated polymer solutions was investigated. It was found that the surface activity of the PBMAm-ec-PFMAn toluene solution and the structure of the gas / liquid interface are closely related to the number of the two structural units. (n) was about 4 and 6, the surface tension of the polymer solution increased from 21 to 25 mN / m with the increase in the degree of polymerization of PBMA (this is the same value as the PBMA homopolymer solution.) The SFG study showed that the PBMA The surface of long-term solution is occupied by PBMA. When the length of PBMA is short, the PFMA components adsorbed on the surface of the solution are arranged more orderly and closely packed.When there is only one FMA unit in the end of PBMA, the surface tension of toluene solution increases with PBMA The length increases slightly (from 22 to 23 mN / m) and is between 21 and 25 mN / m. Studies have shown that when the PBMA stage is short, it is possible that the fluorinated component of the polymer is adsorbed on the surface of the solution, Its arrangement is less ordered.With the increase of the degree of polymerization of PBMA, fluorinated components and PBMA components may When occupying the surface of the solution, then the surface tension of about 23mN / m.