TaŞdelen Mehmet Atilla, AltinkÖk Çağatay
Department of Polymer Materials Engineering, Faculty of Engineering, Yalova University, Yalova Turkey.
Department of Chemistry, Faculty of Science and Letters, İstanbul Technical University, İstanbul Turkey.
Turk J Chem. 2021 Feb 17;45(1):50-59. doi: 10.3906/kim-2007-62. eCollection 2021.
A series of polymer/clay nanocomposites containing mechanistically two different polymers, poly(ethylene glycol) (PEG) and poly(epsilon caprolactone) (PCL), were prepared by simultaneous copper(I)-catalyzed alkyne-azide cycloaddition click reactions. Both clickable polymers, PEG-Alkyne and PCL-Alkyne, were simultaneously clicked on to azide-functional montmorillonite (MMT-N) nanoclay to get corresponding PEG-PCL/MMT nanocomposites. The chemical structures of the resulting nanocomposites were verified by following azide and silicone-oxygen bands using FT-IR and characteristic bands of PEG and PCL segments using H-NMR spectroscopy. The combined XRD and TEM analysis confirmed that all PEG-PCL/MMT nanocomposites had partially exfoliated/intercalated morphologies. In addition, the increase of MMT-N loading not only improved the onset and maximum degradation temperatures of the nanocomposites but also their char yields. Furthermore, the incorporation of MMT-N in the polymer matrix did not significantly influence the crystallization behavior of both PEG and PCL segments.
通过同时进行的铜（I）催化的炔-叠氮环加成点击反应，制备了一系列包含两种机理不同的聚合物——聚乙二醇（PEG）和聚己内酯（PCL）的聚合物/粘土纳米复合材料。两种可点击聚合物，即PEG-炔烃和PCL-炔烃，同时与叠氮官能化的蒙脱石（MMT-N）纳米粘土发生点击反应，以得到相应的PEG-PCL/MMT纳米复合材料。通过傅里叶变换红外光谱（FT-IR）跟踪叠氮和硅氧键，以及通过氢核磁共振光谱（H-NMR）确定PEG和PCL链段的特征峰，对所得纳米复合材料的化学结构进行了验证。结合X射线衍射（XRD）和透射电子显微镜（TEM）分析证实，所有PEG-PCL/MMT纳米复合材料均具有部分剥离/插层的形态。此外，MMT-N负载量的增加不仅提高了纳米复合材料的起始降解温度和最大降解温度，还提高了它们的残炭率。此外，在聚合物基体中加入MMT-N对PEG和PCL链段的结晶行为没有显著影响。
