磺酸甜菜碱与阴离子单体共聚物的合成及溶液性质

合成了N、N-二甲基-N-甲基丙烯酰氧乙基-N-丁基磺酸铵(DMABS)及其与三种阴离子单体——丙烯酸(AAc)、丙烯酸钠(NaAAc)、对乙烯基苯磺酸钠(NaSS)的无规共聚物,并通过核磁共振(1H-NMR)与凝胶渗透色谱-多角度激光光散射(GPC-MALLS)等表征了单体与共聚物的结构。探讨了共聚物稀溶液的相分离温度(TPT),随单体组成、聚合物浓度、溶液pH值与离子强度的变化。结果显示,疏水性单体的引入导致共聚物/水体系的TPT进一步升高;而亲水性单体的引入则显著降低共聚物/水体系的TPT。

Synthesis and Solution Properties of Copolymer of Sulfobetaine and Anionic Monomers

Poly(N,N-dimethyl-N-(methacryloyloxy)ethyl ammonium butane sulfonate)-co-poly(acrylic acid) (PDMABS-co-PAAc),poly(N,N-dimethyl-N-(methacryloyloxy)ethyl ammonium butane sulfonate)-co-poly(sodium acrylate) (PDMABS-co-NaPAAc) and poly(N,N-dimethyl-N-(methacryloyloxy)ethyl ammonium butane sulfonate)-co-poly(sodium styrenic sulfate) (PDMABS-co-NaPSS) were prepared from the radical copolymerization of DMABS with acrylic acid AAc,NaAAc and NaSS,respectively. The copolymers were characterized by nuclear magnetic resonance (1H-NMR) spectroscopy and gel-permeation chromatography. The phase transition temperature (TPT) of the aqueous copolymer mixtures was related to comonomer structure,feed ratio,medium pH and ionic strength. The results show that the aqueous PDMABS-co-NaPSS mixtures have a higher TPT due to the enhanced hydrophobic interactions,while the aqueous PDMABS-co-NaPAAc mixtures have a lower TPT; the introduction of AAc units into the copolymers will further increase the aqueous solubility.