Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning Road, Lanzhou, Gansu, 730070, China.
Key Laboratory of Eco-functional Polymer Materials of the Ministry of Education, Key Laboratory of Eco-environmental Polymer Materials of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, 967 Anning Road, Lanzhou, Gansu, 730070, China.
Chemosphere. 2022 Feb;288(Pt 3):132648. doi: 10.1016/j.chemosphere.2021.132648. Epub 2021 Oct 22.
In this study, inorganic magnesium hydroxide (MH) was modified by three phosphoric acids respectively to obtain three different novel functionalized monomers. The chemical structure and morphology of (P-MH) were analyzed by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). Further, functional monomers were introduced into the PET main chain structure. A new type of high-performance co-polyesters was successfully prepared. The specific structure of P-MH-PET was characterized by H NMR spectroscopy. Thermal stability of P-MH-PETs was analyzed by thermogravimetric analysis (TG) and differential scanning calorimetry (DSC). The flame retardant properties were evaluated by limiting oxygen index (LOI), vertical combustion test (UL-94) and cone calorimeter. The results show that the thermal stability and flame retardant properties of 5%P-MH-PETs are greatly improved. Among them, the best performance is 5%P-MH-PET, LOI is 32.5%, UL-94 test reached V-0 grade. Compared with neat PET, the peak heat release rate (PHRR), peak smoke release rate (PSPR), carbon dioxide release rate (COPR) and carbon monoxide release rate (COPR) decreased by 57.0%, 38.1%, 54.6% and 57.3%, respectively. Fortunately, the mechanical properties of 5%P-MH-PET were also improved.
在这项研究中，分别用三种磷酸对无机氢氧化镁（MH）进行了改性，得到了三种不同的新型功能化单体。通过傅里叶变换红外光谱（FTIR）、X 射线衍射（XRD）和扫描电子显微镜（SEM）对（P-MH）的化学结构和形态进行了分析。进一步，将功能单体引入 PET 主链结构中。成功制备了一种新型高性能共聚酯。通过核磁共振波谱（H NMR）对 P-MH-PET 的特定结构进行了表征。通过热重分析（TG）和差示扫描量热法（DSC）分析了 P-MH-PETs 的热稳定性。通过极限氧指数（LOI）、垂直燃烧试验（UL-94）和锥形量热仪评估了阻燃性能。结果表明，5%P-MH-PET 的热稳定性和阻燃性能得到了极大的提高。其中，性能最佳的是 5%P-MH-PET，LOI 为 32.5%，UL-94 测试达到 V-0 级。与纯 PET 相比，最大热释放速率（PHRR）、最大烟雾释放速率（PSPR）、二氧化碳释放速率（COPR）和一氧化碳释放速率（COPR）分别降低了 57.0%、38.1%、54.6%和 57.3%。幸运的是，5%P-MH-PET 的力学性能也得到了提高。
