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Crucial Role of the Spacer in Tuning the Length of Self-Assembled Nanorods
Macromolecules ( IF 5.1 ) Pub Date : 2020-01-02 , DOI: 10.1021/acs.macromol.9b01928 Shuaiyuan Han 1 , Gaëlle Mellot 1 , Sandrine Pensec 1 , Jutta Rieger 1 , François Stoffelbach 1 , Erwan Nicol 2 , Olivier Colombani 2 , Jacques Jestin 3 , Laurent Bouteiller 1
Macromolecules ( IF 5.1 ) Pub Date : 2020-01-02 , DOI: 10.1021/acs.macromol.9b01928 Shuaiyuan Han 1 , Gaëlle Mellot 1 , Sandrine Pensec 1 , Jutta Rieger 1 , François Stoffelbach 1 , Erwan Nicol 2 , Olivier Colombani 2 , Jacques Jestin 3 , Laurent Bouteiller 1
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Polymeric supramolecular nanorods were prepared in toluene by self-assembly of tris(urea) stickers connected on both sides through alkyl spacers of different lengths to short polystyrene (PS) arms. Several tris(urea) initiators or chain transfer agents were synthesized straightforwardly and used to grow well-defined PS arms via atom transfer radical polymerization (ATRP) or reversible addition fragmentation chain transfer (RAFT) polymerization. Self-assembly was investigated by means of Fourier-transform infrared (FTIR) spectroscopy and light/neutron scattering. A dramatic impact of the spacer separating the tris(urea) sticker from the PS arms on the extent of self-assembly was observed in toluene as long as the degree of polymerization of the PS arms (x) was kept short (x ∼ 10). Indeed, supramolecular nanorods several hundreds of nanometers in length for a few nanometers in radius were obtained with a spacer consisting of nine atoms, whereas five times shorter nanorods were obtained for a spacer of only five atoms, and spherical particles were found in the absence of any spacer, all other parameters remaining unchanged. These results reveal the possibility to tune the length of polymer-decorated supramolecular nanorods with minimal modification of the assembling sticker and without affecting the functionality of the rods.
中文翻译：
间隔物在调整自组装纳米棒长度方面的关键作用
聚合物超分子纳米棒是在甲苯中通过自组装的三（尿素）粘着剂在两端通过不同长度的烷基间隔基连接到短聚苯乙烯（PS）臂上而制备的。直接合成了几种三（脲）引发剂或链转移剂，并用于通过原子转移自由基聚合（ATRP）或可逆加成断裂链转移（RAFT）聚合来生长清晰的PS臂。通过傅立叶变换红外（FTIR）光谱和光/中子散射研究了自组装。只要将PS臂的聚合度（x）保持为较短（x），就可以在甲苯中观察到将tris（urea）胶粘剂与PS臂分开的间隔物对自组装程度的巨大影响。〜10）。的确，使用由九个原子组成的间隔物获得了半径为几纳米的几百纳米长的超分子纳米棒，而仅包含五个原子的间隔物获得了短五倍的纳米棒，并且在不存在六价原子的情况下发现了球形颗粒。任何垫片，所有其他参数保持不变。这些结果揭示了以最小化组装标签的修改并且不影响棒的功能性来调整聚合物装饰的超分子纳米棒的长度的可能性。
更新日期：2020-01-02
中文翻译：
间隔物在调整自组装纳米棒长度方面的关键作用
聚合物超分子纳米棒是在甲苯中通过自组装的三（尿素）粘着剂在两端通过不同长度的烷基间隔基连接到短聚苯乙烯（PS）臂上而制备的。直接合成了几种三（脲）引发剂或链转移剂，并用于通过原子转移自由基聚合（ATRP）或可逆加成断裂链转移（RAFT）聚合来生长清晰的PS臂。通过傅立叶变换红外（FTIR）光谱和光/中子散射研究了自组装。只要将PS臂的聚合度（x）保持为较短（x），就可以在甲苯中观察到将tris（urea）胶粘剂与PS臂分开的间隔物对自组装程度的巨大影响。〜10）。的确，使用由九个原子组成的间隔物获得了半径为几纳米的几百纳米长的超分子纳米棒，而仅包含五个原子的间隔物获得了短五倍的纳米棒，并且在不存在六价原子的情况下发现了球形颗粒。任何垫片，所有其他参数保持不变。这些结果揭示了以最小化组装标签的修改并且不影响棒的功能性来调整聚合物装饰的超分子纳米棒的长度的可能性。
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