铝酸锶荧光竹塑复合材料的制备及性能研究

Research on Preparation and Properties of Strontium Aluminate PhosphorBamboo-Plastic Luminescent Composites

以高密度聚乙烯(HDPE)、竹粉、铝酸锶荧光粉和马来酸酐接枝聚乙烯(MAPE)为原料,通过密炼和注塑制备得到铝酸锶荧光竹塑复合材料。利用紫外-可见光分光光度计、荧光分光光度计、电子万能试验机、摆锤冲击仪和热重分析仪表征了铝酸锶荧光粉对复合材料的荧光性能、力学性能和热稳定性的影响,利用场发射扫描电子显微镜(FESEM)对铝酸锶荧光竹塑复合材料的拉伸断面的形貌进行观察。结果表明,随着铝酸锶荧光粉含量的增加,铝酸锶荧光竹塑复合材料的发光强度先增大后减小再增大,其弯曲强度、弯曲模量、拉伸强度和冲击强度均先增大后减小;场发射扫描电镜显示,随着铝酸锶荧光粉含量的增大,铝酸锶荧光粉在复合材料基体中的分散性变差,团聚增多,界面结合变差;热失重(TG)曲线和一阶微分(DTG)曲线分析表明,铝酸锶荧光竹塑复合材料的热失重为双阶失重过程,第一阶段为竹粉热降解阶段,第二阶段为基体HDPE热降解阶段,随着铝酸锶荧光粉含量的增加,铝酸锶荧光竹塑复合材料的热稳定性增强。

Using high density polyethylene （HDPE）, bamboo flour, strontium aluminate phosphor and maleic anhydride grafted polyethylene （MAPE） as raw material, strontium aluminate phosphor-bamboo-plastic luminescent composites were prepared by banburying and injection molding. The effects of strontium aluminate phosphor content on fluorescence property, mechanical property and thermal stability of the composites were investigated by ultraviolet- visible spectrophotometer, fluorescence spectrophotometer, electronic universal testing machine, pendulum impact tester and TGA. In addition, tensile fracture microstructure of the composites was observed by FESEM. The results showed that the luminous intensity of the composites increased initially with increasing strontium aluminate phosphor content and then decreased. The bending strength, bending modulus, tensile strength and impact strength of the com- posites first increased and then decreased with the increase of strontium aluminate phosphor content. Scanning electron microscopy revealed that the increase of strontium aluminate phosphor content resulted in lower dispersibility of stron- tium aluminate phosphor turned poor in the composites, as well as more aggregation and worse interface bonding. The thermogravimetric （TG） and derivative thermogravimetric （DTG） curves indicated that the thermal weight loss process of strontium aluminate phosphor-bamboo-plastic luminescent composites could be derided into two stages. The first stage is thermal degradation of bamboo powder, and the second stage is thermal degradation of HDPE. The ther- mal stability of the composites increased with the increase of strontium aluminate phosphor content.