Electrospraying the Triblock Copolymer SEBS: The Effect of Solvent System and the Embedding of Quantum Dots,Macromolecular Materials and Engineering

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Electrospraying the Triblock Copolymer SEBS: The Effect of Solvent System and the Embedding of Quantum Dots
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2019-12-19 , DOI: 10.1002/mame.201900658
Robin Koekoekx ₁ , Natalia C. Zawacka ₂ , Guy Van den Mooter ₃ , Zeger Hens ₂ , Christian Clasen ₁

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This work reports on ABA triblock copolymer microparticles encoded with CdSe/CdS core–shell quantum dots (QDs) realized by electrospraying. This method allows for simple but efficient embedding of QDs in polymer beads while retaining the fluorescent properties of the original QDs. The creation of poly(styrene‐ethylene‐butylene‐styrene) (SEBS) monodisperse spherical microparticles with a tunable morphology for applications of the final QD‐loaded product is attainable via solvent variation. By varying the selectivity of the solvent for one of the distinct blocks in the polymer, the final particle morphology can be selectively altered while maintaining the same overall process conditions, allowing to tailor the particles from homogeneously flat in a nonselective solvent to dense spherical particles in an endblock selective solvent system. The mechanism responsible for this transition in morphology can be related to differences in mass transfer in the droplets and thus solvent evaporation rates arising from particular microphase structures. Finally, fluorescence characteristics of the final QD‐embedded polymer particles and photodegradation stability are investigated by spectrophotometry and are compared to the temporal evolution of the original QDs, indicating significant stability improvement and well‐dispersed QDs in an optimized polymer matrix morphology.

中文翻译：

电喷涂三嵌段共聚物SEBS：溶剂体系的影响和量子点的嵌入

这项工作报道了通过电喷雾实现的CdSe / CdS核-壳量子点（QDs）编码的ABA三嵌段共聚物微粒。该方法允许将QD简单但有效地嵌入聚合物珠粒中，同时保留原始QD的荧光特性。通过最终溶剂的变化，可以生成具有可调节形态的聚（苯乙烯-乙烯-丁烯-苯乙烯）（SEBS）单分散球形微粒，以用于最终QD负载产品。通过改变溶剂对聚合物中不同嵌段之一的选择性，可以在保持相同的总体工艺条件的同时，选择性地改变最终粒子的形态，从而使粒子在非选择性溶剂中从均一的平整变为密实的球形粒子。端基选择性溶剂系统。造成这种形态转变的机制可能与液滴中传质的差异有关，从而与特定微相结构引起的溶剂蒸发速率有关。最后，通过分光光度法研究了最终嵌入QD的聚合物颗粒的荧光特性和光降解稳定性，并将其与原始QD的时间演变进行了比较，表明在优化的聚合物基质形态中，稳定性得到了显着改善，QD分散得很好。

更新日期：2020-02-14

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