Abstract We report on the preparation and characterization of fluorescent polymer nanocomposites based upon poly(lactic acid) (PLA) or linear low density polyethylene (LDPE) filled with 5 wt% of fluorescein-modified layered nanoparticles. Modified layered double hydroxide (LDH) nanoparticles were prepared by co-intercalation of fluorescein and alkyl sulfate anions thus yielding to three hybrid samples having different lambda of emission and quantum yield, depending on fluorophore content and presence of dye aggregates. Further separation of Flu aggregates by dispersion of less fluorescent co-intercalated LDHs in PLA and LDPE resulted in an increase of the quantum yield, with better results for PLA-based nanocomposites in agreement with a better morphology. Preliminary data indicated the possible use of these materials as ON/OFF humidity indicators.

中文翻译：

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含有荧光素改性层状双氢氧化物的荧光 LDPE 和 PLA 纳米复合材料及其对湿度的开/关响应行为

摘要 我们报告了基于聚乳酸 (PLA) 或线性低密度聚乙烯 (LDPE) 的荧光聚合物纳米复合材料的制备和表征，其中填充了 5 wt% 的荧光素改性层状纳米颗粒。改性层状双氢氧化物 (LDH) 纳米粒子通过荧光素和烷基硫酸根阴离子的共嵌入制备，从而产生具有不同发射 λ 和量子产率的三种混合样品，具体取决于荧光团含量和染料聚集体的存在。通过在 PLA 和 LDPE 中分散较少荧光的共嵌入 LDH 来进一步分离 Flu 聚集体导致量子产率的增加，PLA 基纳米复合材料的结果更好，与更好的形态一致。初步数据表明这些材料可能用作开/关湿度指示器。