原子力显微镜研究三聚氰胺甲醛微胶囊在模型织物表面的吸附机理

Characterization of Melamine Formaldehyde Microcapsule Adhesion on Model Fabric Surface by Atomic Force Microscopy

利用原子力显微镜研究三聚氰胺甲醛微胶囊在模型织物表面的吸附力,其中壳聚糖被用来改性以纤维素膜为模型织物的表面.实验结果表明:利用壳聚糖溶液改性纤维素膜,单个微胶囊与纤维素膜间的吸附力从2.3±1.0 n N增加到57.7±31.1 n N(接触时间为0.01 s).因此,利用壳聚糖改性纤维素膜能够增加三聚氰胺甲醛微胶囊在织物表面的吸附力.同时,通过进一步分析原子力显微镜测试得到的"力-位移图"发现:纤维素分子链伸展产生的桥接力是影响微胶囊和未改性纤维素膜之间作用力的主要原因;而静电力是影响微胶囊与壳聚糖改性纤维素膜之间作用力的主要原因.

The adhesion of melamine formaldehyde microcapsules on a model fabric surface is investigated by atomic force microscopy（ AFM）. A cellulose film is employed as a model fabric surface. It is found that the adhesion between single microcapsule and the cellulose thin film increases from 2. 3 ± 1. 0 n N to 57. 7 ± 31. 1 n N,as measured by AFM with a contact time of 0. 01 s. Modification of the cellulose with chitosan is thus proven to increase the adhesion of microcapsules on the model fabric surface. The AFM force- displacement data reveal that bridging forces resulting from the extension of cellulose chains dominate the adhesion between the microcapsule and unmodified cellulose film,whereas electrostatic attraction helps to adhere the microcapsule to the chitosan-modified cellulose film.