A New Benzoxazine Containing Benzoxazole-Functionalized Polyhedral Oligomeric Silsesquioxane and the Corresponding Polybenzoxazine Nanocomposites

作者：Zhang, Kan; Zhuang, Qixin; Liu, Xiaoyun^*; Yang, Guang; Cai, Ruilong; Han, Zhewen

来源：Macromolecules, 2013, 46(7): 2696-2704.

DOI：10.1021/ma400243t

• PARA-AROMATIC POLYMERS
• RIGID-ROD POLYMERS
• THERMAL-DECOMPOSITION
• POSS
• POLYMERIZATION
• THERMOSETS
• RESIN
• FILMS
• UNITS

A new benzoxazole-modified [PhSiO1.5](8)(OPS) benzoxazine (OPS-Bz) was synthesized and used to prepare polyhedral oligomeric silsesquioxane (POSS)/ polybenzoxazine (PBz) nanocomposites. Fourier transform infrared spectroscopy (FTIR), H-1 NMR, Si-29 NMR, differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to characterize the structure of OPS-Bz. The high resolution transmission electron microscopy images of POSS/PBz(30/70) nanocomposites showed a well separated nanostructure of POSS with a typical phase size of 3-10 nm. POSS was highly dispersed in the polymer matrix because of the benzoicazole groups around the OPS molecular, in which the rigid benzoxazole groups increased the distance among the POSS molecules and reduced the aggregation of POSS nanoparticles. The TGA study showed these nanocomposites possess good thermal stability. Moreover, the dielectric constants and dielectric loss of these POSS/PBz nanocomposites were low and changed slightly at room temperature in the frequency range of 10 Hz to 1 MHz.

• 出版日期2013-4-9
• 单位华东理工大学