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首页> 外文期刊>Science and Technology of Advanced Materials >Characterization of sodium poly(4-styrenesulfonate)-grafted polymer fine particles synthesized by core-cross-linking of block copolymer micelles
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Characterization of sodium poly(4-styrenesulfonate)-grafted polymer fine particles synthesized by core-cross-linking of block copolymer micelles

机译：嵌段共聚物胶束核交联合成聚4-苯乙烯磺酸钠接枝的聚合物细颗粒的表征

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摘要

The detailed structure and unique characteristics of a sodium poly(4-styrenesulfonate)-grafted nanoparticle, CCL-SBS_(113)-b-SSNa_(208), were investigated, where CCL, SBS, and SSNa represent a core-cross-linked micelle, 4-(l-methylsilacyclobutyl)styrene, and sodium 4-styrenesulfonate, respectively. The particle nanostructure was analyzed by small-angle neutron scattering (SANS), dynamic light scattering (DLS), and atomic force microscopy. SANS data suggested that the particle had a core-corona structure with a 14-nm core radius (R_c) and 2-nm radius of gyration (R_g) corona-forming chain in water. DLS analysis revealed that the hydrodynamic radius (R_h) of particle was 100 nm in water, which is much larger than the whole particle size evaluated by SANS, but the R_h value gradually decreased with addition of NaCl and reached a constant value of 61 nm at an NaCl concentration above 0.2M. Conductometric titration of the acidic form sample with NaOH_(aq) suggested that the CCL-micelle had exactly the same content of sulfonate groups as the precursor block copolymer. The polySSNa-grafting particle showed high solution stability toward salt addition, which may be due to the electrostatic stabilization effect in addition to steric stabilization by the grafting polymer chains.
机译：研究了聚（4-苯乙烯磺酸钠）接枝的纳米颗粒CCL-SBS_（113）-b-SSNa_（208）的详细结构和独特特性，其中CCL，SBS和SSNa代表核交联胶束，4-（1-甲基硅烷基环丁基）苯乙烯和4-苯乙烯磺酸钠。通过小角度中子散射（SANS），动态光散射（DLS）和原子力显微镜分析了颗粒的纳米结构。 SANS数据表明，该粒子具有核电晕结构，在水中具有14 nm的核半径（R_c）和2 nm的回转半径（R_g）电晕形成链。 DLS分析表明，颗粒在水中的水动力半径（R_h）为100 nm，远大于SANS评估的整个粒径，但随着NaCl的添加，R_h值逐渐降低，在室温下达到61 nm的恒定值。 NaCl浓度高于0.2M。用NaOH_（aq）对酸性形式的样品进行电导滴定表明，CCL-胶束具有与前体嵌段共聚物完全相同的磺酸根基团含量。聚SSNa接枝颗粒显示出对盐添加的高溶液稳定性，这可能是由于除了通过接枝聚合物链的空间稳定之外的静电稳定作用。

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