Effect of Interaction between Transition Metal Oxides and Nitrogen Atoms on Thermal Stability of Polybenzoxazine
Effect of Interaction between Transition Metal Oxides and Nitrogen Atoms on Thermal Stability of Polybenzoxazine
复制标题
DOI：
10.1080/00222348.2010.502495
复制
发表时间：
2011-05
期刊：
影响因子：
--
通讯作者：
Yongfei Zhu;Yi Gu
中科院分区：
文献类型：
--
作者：
Yongfei Zhu;Yi Gu
为了研究过渡金属氧化物与聚苯并恶嗪的相互作用及其对聚苯并恶嗪热降解机理的影响，将Y2 O3、La 2 O3、Pr 6 O 11和Gd 2 O3分别添加到以对甲酚和苯胺为单体的苯并恶嗪中，制备了聚苯并恶嗪复合材料。采用傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）和差示扫描量热法（DSC）对聚苯并恶嗪及其复合材料的化学结构和最终聚合程度进行了表征。通过凝胶渗透色谱法（GPC）测定这些固化样品的分子量。采用动态力学分析（DMA）、热重分析（TGA）、热重-红外联用（TG-IR）和裂解-气相色谱-质谱联用（Py-GC-MS）研究了过渡金属氧化物对聚苯并恶嗪基体热性能的影响。这种配位作用可以锚苯胺，使聚苯并恶嗪基体的分子量增加，从而延缓了苯胺在热降解过程中的挥发，提高了800°C时的残炭率，提高了聚苯并恶嗪复合材料的玻璃化转变温度（Tg）。
To investigate the interaction of transition metal oxides with polybenzoxazine and their influence on the thermal degradation mechanism of polybenzoxazine, transition metal oxides Y2O3, La2O3, Pr6O11, and Gd2O3 were added to benzoxazine monomer based on p-cresol and aniline to prepare polybenzoxazine composites. The chemical structures and final polymerization extent of polybenzoxazine and its composites were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), and differential scanning colorimetry (DSC). The molecular weights of these cured samples were determined by gel permeation chromatography (GPC). The influence of transition metal oxides on the thermal properties of polybenzoxazine matrix was investigated using dynamic mechanical analysis (DMA), thermogravimetric analysis (TGA), thermogravimetric analyzer interfaced with Fourier transform infrared spectroscopy (TG-IR), and (pyrolysis-gas chromatography-mass spectrometry) Py-GC-MS. The results show that transition metal oxides can form coordination interactions with the nitrogen atoms of polybenzoxazine. The coordination interaction can anchor the aniline and make the molecular weights of polybenzoxazine matrix increase, which delays evaporation of aniline during thermal degradation, improves the char yield at 800°C, and increases the glass transition temperatures (Tg) of polybenzoxazine composites.