Abstract The effect of crosslinking on the morphology of nanocapsules synthesized by vesicle-templated reversible addition-fragmentation chain transfer (RAFT) polymerization was investigated and it was found that although crosslinking increases the fraction of protruded capsules, it is not the origin of the protrusions. Starved-feed emulsion polymerization of methyl methacrylate and tert-butyl acrylate with varying amounts of a range of crosslinkers using a seed of cationic vesicles covered by anionic co-oligomers containing a RAFT functional group, results in several different structures, with true spherical capsules and protruded capsules being the main products under the used reaction conditions. Quantitative cryoTEM studies allowed the counting of the different morphologies and it was found that the final fraction of protruded structures strongly depended on the used crosslinker. In the case of using 10 mol% of ethylene glycol dimethacrylate, ∼90% of the observed structures were protruded capsules, whereas this was only ∼4% in the case of 10 mol% ethylene glycol diacrylate. Finally, tomography showed that the protrusions are an integral part of the polymer shell.

中文翻译：

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基于 RAFT 的囊泡聚合中交联纳米胶囊形态的定量 CryoTEM 研究

摘要 研究了交联对囊泡模板可逆加成断裂链转移 (RAFT) 聚合合成纳米胶囊形貌的影响，发现虽然交联增加了突出胶囊的比例，但并不是突出的起源。使用由包含 RAFT 官能团的阴离子共聚低聚物覆盖的阳离子囊泡种子，甲基丙烯酸甲酯和丙烯酸叔丁酯与不同数量的一系列交联剂的饥饿进料乳液聚合，产生几种不同的结构，具有真正的球形胶囊和在所使用的反应条件下，突出的胶囊是主要产物。定量cryoTEM 研究允许对不同形态进行计数，并且发现突出结构的最终分数在很大程度上取决于所使用的交联剂。在使用 10 mol% 乙二醇二甲基丙烯酸酯的情况下，约 90% 的观察结构是突出的胶囊，而在 10 mol% 乙二醇二丙烯酸酯的情况下，这一比例仅为约 4%。最后，断层扫描显示突起是聚合物壳的组成部分。