Preparation and properties of polylactic acid-based composite fluorescent membrane based on layer-by-layer assembly

eXPRESS Polymer Letters

M. M. Wang¹ 

关键词: polymer composites;    polylactic acid;    layer-by-layer assembly;    photoluminescence;    controllability;   

DOI  :  10.3144/expresspolymlett.2019.56

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

In this paper, a kind of multi-functional polylactic acid-based membrane with adjustable aggregate thickness andproperties was prepared. When the number of assembled layers was 20 bilayers, the mean thickness of every bilayer was foundto be 10.75±0.25 nm, and the tensile strength was increased by 20% compared with the polylactic acid (PLA) films. The assembledlayered double hydroxides (LDHs) could serve as a type of promising organic-inorganic luminescent material, andendow PLA with photoluminescent properties. Besides, the photoluminescence of the composite films was discovered to behighly tunable by simply adjusting the structural constituents of LDHs, and the fluorescence intensity was uniformly enhancedas the number of assembled layers increases, which was not eliminated by the isolation due to cellulose nanocrystals (CNCs).Moreover, the composite films exhibited excellent fluorescence stability in comparison with the literature. After being repeatedlybleached 1000 times by confocal laser scanning fluorescence microscope, the fluorescence intensity of the PLA/(CNCs/Mg-Al-Eu LDHs)10 film remained 96%. It could be concluded that the immobilization of CNCs and LDHs realized the microscopiccontrollability of the optical functional molecular spacing. With satisfactory fluorescence, the resulting PLA-based membranesexhibited considerable application potential in optoelectronic devices and anti-counterfeiting packaging.

【 授权许可】

CC BY