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首页> 美国卫生研究院文献>Polymers >Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence Thermal and Mechanical Characteristics
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Strontium Aluminate-Based Long Afterglow PP Composites: Phosphorescence Thermal and Mechanical Characteristics

机译：基于铝酸盐的长余辉PP复合材料：磷光热和机械特性

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摘要

A tremendous potential has been observed in the designing of long afterglow materials for sensing, bioimaging, and encryption applications. In this study, two different strontium aluminate-based luminescent materials; SrAl2O4: Eu, Dy (S1), and Sr4Al14O25: Eu, Dy (S2) were melt-mixed with polypropylene (PP) matrix, and the phosphorescence properties were evaluated. After excitation at 320 nm, the PP/S1 composite exhibited a green emission and the PP/S2 generated a blue emission at 520 nm and 495 nm, respectively. The emission spectra intensity increased by increasing the content of these luminescent fillers. The attenuated total reflection-Fourier transform infrared (ATR-FTIR) experiments show that no chemical reaction occurred during the melt-mixing process. The differential scanning calorimetry (DSC) results revealed that the total crystallinity of the composites reduced by increasing the amount of the fillers; however, no changes in the temperature of melting (Tm) and crystallization (Tc) of PP were observed. Both fillers improved the impact strength of the composites, but the tensile strength (TS) and modulus (TM) decreased. Poly (ethylene glycol) dimethyl ether (P) plasticizer was used to improve the filler-matrix interaction and its dispersion; nevertheless, it adversely affected the intensity of the luminescence emissions.
机译：在设计用于感测，生物成像和加密应用的长期余辉材料中，已经观察到巨大的潜力。在这项研究中，两种不同的基于葡萄氨酸的铝酸盐的发光材料; SRAL2O4：EU，DY（S1）和SR4AL14O25：EU，DY（S2）与聚丙烯（PP）基质融合，评价磷光性质。在320nm激发后，PP / S1复合材料表现出绿色发射，PP / S2分别在520nm和495nm处产生蓝色发射。通过增加这些发光填料的含量，发射光谱强度增加。衰减的总反射 - 傅立叶变换红外（ATR-FTIR）实验表明，在熔融混合过程中没有发生化学反应。差分扫描量热法（DSC）结果显示，通过增加填料的量，复合材料的总结晶度降低;然而，观察到PP的熔融（TM）温度和结晶（TC）的变化没有变化。两种填料改善了复合材料的冲击强度，但抗拉强度（TS）和模量（TM）降低。聚（乙二醇）二甲醚（P）增塑剂用于改善填料 - 基质相互作用及其分散体;尽管如此，它会对发光排放的强度产生不利影响。

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