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首页> 外文期刊>RSC Advances >A comparative study of the self-assembly of achiral and chiral hairy nanoparticles with polystyrene cores and poly(2-hydroxyethylmethacrylate) hairs
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A comparative study of the self-assembly of achiral and chiral hairy nanoparticles with polystyrene cores and poly(2-hydroxyethylmethacrylate) hairs

机译：聚苯乙烯芯和聚（2-羟乙基甲基丙烯酸酯）毛发的成立和手性母纳米粒子自组装的比较研究

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摘要

Hairy nanoparticles with polystyrene cores (PS cores) and poly(2-hydroxyethylmethacrylate) (PHEMA) shells were synthesized by combining living anionic polymerization and atom transfer radical polymerization (ATRP). The structural characterization was carried out by FT-IR and NMR spectroscopy (H-1 NMR,C-13 NMR, APT(13)C NMR and(1)H(13)C HMQC). The thermal stability of the PS cores was not affected by grafting PHEMA on their surfaces. A differential scanning calorimetry (DSC) thermogram of the HNPs showed two distinct transition temperatures indicating microphase separation. Chiral HNPs were prepared by inducing chirality in the achiral HNPs by complexation withR- orS-mandelic acid. The circular dichroism (CD) spectroscopy of complexes of the HNPs/R- orS-mandelic acid indicated the formation of enantiomeric chiral structures. The self-assembled structures formed from the achiral HNPs show different surface morphologies, porous and zigzag, dependent on the solvents used. Blends of polystyrene functionalized with hydroxyl groups and PHEMA show different morphology and thermal properties compared with the core-shell HNP system. The chiral HNPs self-assembled into donut like structures or toroids with sizes in the range between 200 to 5000 nm. The study suggests that chirality can be utilized to develop interesting self-assembled structures.
机译：通过组合活性阴离子聚合和原子转移自由基聚合（ATRP），合成具有聚苯乙烯芯（PS芯）和聚（2-羟乙基甲基丙烯酸酯）（PHEMA）壳的毛状纳米粒子。通过FT-IR和NMR光谱（H-1 NMR，C-13 NMR，APT（13）C NMR和（1）H（13）C HMQC）进行结构表征。 PS核的热稳定性不受移植物质在其表面上的影响。 HNPS的差分扫描量热法（DSC）热图显示出两种不同的过渡温度，表明微单分离。通过络合与蛋白酸的络合诱导成胆管HNPS的手性来制备手性HNP。 HNPS / R-或ss-mendelic酸的复合物的圆形二中间（CD）光谱表明了对映体手性结构的形成。由Achiral HNP形成的自组装结构显示不同的表面形态，多孔和曲折，取决于所用的溶剂。与核壳HNP系统相比，用羟基和PHEMA官能化的聚苯乙烯混合物显示出不同的形态和热性能。手性HNP自组装成甜甜圈，如结构或环形的尺寸在200至5000nm之间。该研究表明，可用于开发有趣的自组装结构的手性。

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  • 来源
    《RSC Advances》 |2020年第61期|共11页
  • 作者

    Habel Azza; Khan Ishrat M.;

  • 作者单位

    Clark Atlanta Univ Dept Chem Atlanta GA 30314 USA;

    Clark Atlanta Univ Dept Chem Atlanta GA 30314 USA;

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  • 正文语种 eng
  • 中图分类 化学;
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