Structural Colors Derived from the Combination of Core–Shell Particles with Cellulose

IF 3.7 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Advanced Photonics Research Pub Date : 2024-07-22 DOI:10.1002/adpr.202400091
Regina Leiner, Lukas Siegwardt, Catarina Ribeiro, Jonas Dörr, Christian Dietz, Robert W. Stark, Markus Gallei
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Abstract

Combining cellulose-based components with functional materials is highly interesting in various research fields due to the improved strength and stiffness of the materials combined with their low weight. Herein, the mechanical properties of opal films are improved by incorporating cellulose fibers and microcrystalline cellulose. This is evidenced by the increase in tensile strength of 162.8% after adding 10 wt% of microcrystalline cellulose. For this purpose, core–shell particles with a rigid, crosslinked polystyrene core and a soft shell of poly(ethyl acrylate) and poly(ethyl acrylate-co-hydroxyethyl methacrylate) are synthesized via starved-feed emulsion polymerization. The synthesized particles’ well-defined shape, morphology, and thermal properties are analyzed using transmission electron microscopy, scanning electron microscopy, and differential scanning calorimetry measurements. Free-standing mechanochromic opal films with incorporated cellulose and structural colors are obtained after processing the core–shell particles with cellulose via extrusion and the melt-shear organization technique. The homogeneous distribution of the cellulose within the composite material is investigated using fluorescent-labeled cellulose. The opal film's angle-dependent structural color is demonstrated using reflection spectroscopy.

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核壳粒子与纤维素结合产生的结构色彩
将纤维素基成分与功能材料相结合在各个研究领域都非常有意义,因为纤维素基材料的强度和刚度都有所提高,而且重量轻。在这里,通过加入纤维素纤维和微晶纤维素,乳白薄膜的机械性能得到了改善。加入 10 wt% 的微晶纤维素后,拉伸强度提高了 162.8%,这就是证明。为此,我们通过饥饿进料乳液聚合法合成了具有刚性交联聚苯乙烯芯和聚丙烯酸乙酯和聚丙烯酸乙酯-甲基丙烯酸羟乙酯软壳的核壳颗粒。利用透射电子显微镜、扫描电子显微镜和差示扫描量热法测量分析了合成颗粒的明确形状、形态和热性能。通过挤压和熔融剪切组织技术将核壳颗粒与纤维素一起加工后,得到了含有纤维素和结构色的独立机械变色乳白色薄膜。使用荧光标记的纤维素对纤维素在复合材料中的均匀分布进行了研究。利用反射光谱法展示了蛋白石薄膜随角度变化的结构颜色。
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