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Salt-free dyeing isotherms of cotton fabric grafted with PPI dendrimers

机译：PPI树状大分子接枝棉织物的无盐染色等温线

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摘要

In this work, cotton fabrics grafted with poly (propylene imine) PPI dendrimers (second and fifth generations) were dyed with three different direct dyes (Direct Orange 34, Direct Red 83 and Direct Blue 199) using the salt-free dyeing method. Results showed that the color strength (K/S) of the grafted samples had been markedly enhanced compared with control samples. In addition, the equilibrium and kinetic data of the dye sorption process were evaluated using well-known mathematical models. It was found that the isotherm data of both direct dyes (Direct Orange 34 and Direct Red 83) followed the Langmuir sorption model, while the Freundlich model was able to describe the sorption isotherm of Direct Blue 199 on the grafted cotton fabric. Furthermore, the experimental data of the three direct dyes were fitted by the nonlinear pseudo-second order kinetic model. Wash, light and rubbing fastnesses of the dyed cotton samples were also investigated.
机译：在这项工作中，使用无盐染色方法将接枝有聚（丙烯亚胺）PPI树枝状聚合物（第二和第五代）的棉织物用三种不同的直接染料（直接橙34，直接红83和直接蓝199）染色。结果表明，与对照样品相比，接枝样品的色强度（K / S）显着提高。此外，使用众所周知的数学模型评估了染料吸附过程的平衡和动力学数据。发现两种直接染料（直接橙34和直接红83）的等温线数据遵循Langmuir吸附模型，而Freundlich模型能够描述直接蓝199在接枝棉织物上的吸附等温线。此外，通过非线性伪二级动力学模型拟合了三种直接染料的实验数据。还研究了染色棉样品的耐洗，耐晒和耐摩擦牢度。

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