Synthesis and characterization of organic-inorganic macrocyclic molecular brushes with poly(蔚-caprolactone) side chains
- 作者：Jin Han ; Liliang Zhu ; Sixun Zheng ; szheng@sjtu.edu.cn
- 关键词：Organic&ndash ; inorganic macrocyclic molecular brush ; Macrocyclic oligomeric silsesquioxanes ; Poly(蔚-caprolactone) ; Synthesis and characterization
- 刊名：European Polymer Journal
- 出版年：2012
- 期刊代码：35_00143057
- 类别：ms
- 出版时间：April, 2012
- 卷：48
- 期：4
- 页码：730-742
- 文件大小：688 K
摘要
In this work, we reported the synthesis of a dodecahydroxyl-functionalized macrocyclic oligomeric silsesquioxane (MOSS). The novel 24-membered hydroxyl-functionalized MOSS was employed as a macroinitiator for the ring-opening polymerization of 蔚-caprolactone (CL) and the organic-inorganic macrocyclic molecular brushes with poly(蔚-caprolactone) (PCL) side chains were successfully synthesized. The organic-inorganic macrocyclic molecular brushes were characterized by means of nuclear magnetic resonance spectroscopy (NMR) and gel permeation chromatography (GPC). The results of wide angle X-ray diffraction (XRD) indicate that the architecture of the organic-inorganic macrocyclic molecular brushes did not alter the structure of PCL crystals. Differential scanning calorimetry (DSC) shows that the architecture of organic-inorganic macrocyclic molecular brushes significantly affected the rearrangement of PCL crystals. Compared to linear PCL, the organic-inorganic macrocyclic molecular brushes possessed the improved thermal stability in terms of the temperatures at the maximum of degradation rate and the yields of degradation residues.