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用三硫代碳酸二(α,α′-二甲基-α-乙酸)酯(BDATC)作为链转移剂,苯乙烯St作为第一单体,通过可逆加成-断裂链转移聚合(RAFT)方法合成出大分子链转移剂PSt-CTA,以丙烯酸AA作为第二共聚单体合成出3个不同嵌段比的两亲性嵌段共聚物聚苯乙烯-b-聚丙烯酸-b-聚苯乙烯(PSt-b-PAA-b-PSt).通过傅里叶变换红外光谱(FTIR)和核磁共振氢谱(1H-NMR)确定了PSt-b-PAA-b-PSt结构,使用凝胶渗透色谱(GPC)测定了大分子引发剂PSt-CTA和嵌段共聚物PSt-b-PAA-b-PSt的分子量及分子量分布.将这3个不同嵌段比的两亲性嵌段共聚物在离子液体1-丁基-3-甲基咪唑六氟磷酸盐[BMIM][PF6]中进行自组装,用透射电子显微镜(TEM)观察聚合物在离子液体中自组装结构.研究发现,当PSt的链段长度固定时,胶束的自组装形态主要依赖于PAA链的长度.当PAA链段较长时,胶束呈球形;PAA链段变得较短时,胶束的形态则由球形转变为核壳结构,并且胶束形态在25℃至100℃之间不受温度影响.
Styrene St as the first monomer was synthesized by reversible addition-fragmentation chain transfer polymerization (RAFT) using bis (α, α’-dimethyl-α-acetate) trithiocarbonate (BDATC) Methods The macromolecular chain transfer agent PSt-CTA was synthesized, and three amphiphilic block copolymers of polystyrene-b-polyacrylic acid-b-polybenzene were synthesized by using acrylic acid AA as the second comonomer. (PSt-b-PAA-b-PSt). The structure of PSt-b-PAA-b-PSt was confirmed by Fourier transform infrared spectroscopy (FTIR) and 1H- The molecular weight and molecular weight distribution of PSt-CTA and PSt-b-PAA-b-PSt were determined by chromatography (GPC). The amphiphilic block copolymers of these three different block ratios The ionic liquid 1-butyl-3-methylimidazolium hexafluorophosphate [BMIM] [PF6] was self-assembled and its structure was observed by transmission electron microscopy (TEM) .It was found that when PSt , The micelles self-assembled morphology mainly depends on the length of the PAA chain.When the length of the PAA segment is longer, the micelles are spherical; when the length of the PAA segment becomes shorter, the morphology of the micelles is spherical Into a nuclear shell junction And micellar independent of temperature between 25 deg.] C to 100 ℃.