Double-Encapsulated Microcapsules for the Adsorption to Cotton Fabrics

Double-encapsulated microcapsules (DEMs) were prepared and effectively adsorbed onto the cotton fabric surfaces during impregnation without crosslinking agents to obtain functional cotton fabrics. Specifically, Fourier transform infrared spectrometer (FTIR) and confocal laser scanning microscope (CLSM) showed two different molecules (lavender essence and dye indigo) were encapsulated into the microcapsules simultaneously, with loading capacity of 10% and 9.73%, respectively. The spherical shape of DEMs was confirmed by transmission electron microscopy (TEM), confocal laser scanning microscope (CLSM) and average particle sizes were about 617 nm, as measured by dynamic light scattering (DLS). According to the results of IR and X-ray photoelectron spectroscopy (XPS) experiments, DEMs was combined with cotton fabrics by hydrogen bond. The superior thermal stability of microcapsules and functional cotton fabrics was also demonstrated. The adsorption behavior and mechanism of microparticles onto cotton fabrics were further examined by chemical property characterization in combination with adsorption kinetic model. The kinetic adsorption process included three stages: fast adsorption, slow adsorption rate, and adsorption equilibrium. Finally, the good color fastness of the functional cotton fabrics was demonstrated by the tests of rubbing and accelerated laundering. Herein, this study will be beneficial to the development of functional cotton fabrics-based materials.

制备了双包封微胶囊（DEMs），在无交联剂的浸渍过程中有效地吸附在棉织物表面，从而获得功能性棉织物。具体而言，傅里叶变换红外光谱仪（FTIR）和共聚焦激光扫描显微镜（CLSM）表明两种不同的分子（薰衣草香精和染料靛蓝）同时被包封在微胶囊中，负载量分别为10%和9.73%。通过透射电子显微镜（TEM）、共聚焦激光扫描显微镜（CLSM）确认了DEMs的球形，动态光散射（DLS）测量其平均粒径约为617 nm。根据红外（IR）和X射线光电子能谱（XPS）实验结果，DEMs通过氢键与棉织物结合。还证明了微胶囊和功能性棉织物具有优异的热稳定性。通过化学性质表征结合吸附动力学模型进一步研究了微粒在棉织物上的吸附行为和机理。动力学吸附过程包括三个阶段：快速吸附、吸附速率缓慢和吸附平衡。最后，通过摩擦和加速洗涤试验证明了功能性棉织物具有良好的色牢度。在此，本研究将有利于基于功能性棉织物的材料的开发。