聚乙烯/石墨层间化合物热降解过程的TG-FTIR研究

将含磷化合物插层石墨层间化合物(GIC)用于聚乙烯(PE)的阻燃,采用氧指数(LOI)方法评价了PE/GIC的阻燃性能,并采用热分析-红外光谱联用技术(TG-FTIR)研究了PE/GIC的热降解过程,探讨了GIC的阻燃机理。研究表明,不同含磷化合物插层GIC阻燃聚乙烯的氧指数有显著差别,其中以多聚磷酸铵-GIC的阻燃效果较好,氧指数较高。TG-FTIR研究结果表明,GIC并未显著影响PE的热降解方式,但由于GIC体积膨胀所发生的氧化还原反应导致部分PE热降解提前并发生热氧化降解,促进了后期成炭的石墨化过程。     

磷酸铵与多聚磷酸铵插层可膨胀石墨的制备

Expandable graphite intercalated by ammonium phosphate (AP) or ammonium polyphosphate (APP) was prepared by direct intercalation and two-step method, respectively. The products from two-step method show higher expansion volume, more weight increase and more weight loss after expansion, suggesting that the two-step method is a favorable method for preparation of APP intercalated EG. XRD provides convincing evidence for successful formation of APP-EG by showing strong diffraction peak at much lower 2θ angle. Scanning electron microscopy (SEM) with energy dispersive X-ray Spectroscopy (EDS) gives more evidence for intercalation of APP in the graphite layers.     

La~(3+)掺杂Eu~(3+)偏苯三酸邻菲咯啉三元配合物的合成和荧光性能

以偏苯三酸(TLA)为第一配体,邻菲咯啉(phen)为第二配体,合成了铕偏苯三酸邻菲咯啉及铕镧系列发光配合物Eu1-xLax(TLA)phen(x=0.0,0.1,0.2,0.3,0.4,0.5,0.6,0.7,0.8)。通过红外光谱、TG-DTG和扫描电子显微镜对配合物进行了表征;通过荧光光谱分析,探讨了掺杂荧光惰性离子对三元配合物的发光性能的影响。结果表明:该系列配合物均表现为强的Eu3+的特征荧光,La3+的掺入能增强配合物的的荧光强度,但发射峰的位置基本上没有变化,其中5D0→7F1和5D0→7F2的跃迁发射较强,所有掺杂配合物的荧光强度都大于未掺杂的配合物的荧光强度。