The preparation of well‐defined block copolymers using controlled radical polymerization depends on the proper order of monomer addition. The reversed order of monomer addition results in a mixture of block copolymer and homopolymer and thus has typically been avoided. In this paper, the low blocking efficiency of reversed monomer addition order is utilized in combination with surface initiated reversible addition−fragmentation chain‐transfer polymerization to establish a facile procedure toward mixed polymer brush grafted nanoparticles SiO₂‐g‐(PS (polystyrene), PS‐b‐PMAA (polymethacrylic acid)). The SiO₂‐g‐(PS, PS‐b‐PMAA) nanoparticles are analyzed by gel permeation chromatography deconvolution, and the fraction of each polymer component is calculated. Additionally, the SiO₂‐g‐(PS, PS‐b‐PMAA) are amphiphilic in nature and show unique self‐assembly behavior in water.

中文翻译：

---

一种有用的方法，通过从具有相反单体添加顺序的表面聚合嵌段共聚物来制备混合刷式聚合物接枝的纳米颗粒

使用受控的自由基聚合制备定义明确的嵌段共聚物取决于单体添加的正确顺序。单体添加的相反顺序导致嵌段共聚物和均聚物的混合物，因此通常避免了。在本文中，反向单体加成顺序的低封闭效率与表面引发的可逆加成-断裂链转移聚合相结合，为混合聚合物刷接纳米粒子SiO ₂ - g-（PS（聚苯乙烯）， PS‐ b ‐ PMAA（聚甲基丙烯酸）。SiO ₂ ‐ g‐（PS，PS‐ b‐PMAA）纳米颗粒通过凝胶渗透色谱去卷积分析，并计算出每种聚合物组分的分数。此外，将SiO ₂ -克- （PS，PS- b -PMAA）在自然界中的两亲性，并显示在水中独特的自组装行为。