【摘要】 介绍了一个通过铜乙二胺法测定纤维素特性粘度的改进实验。在该方法中,木质素对纤维素特性粘度的测定会产生巨大影响。为了探讨这一问题,本实验构建纤维素-木质素模型,讨论了木质素含量对纤维素特性粘度的影响,并采用改进的计算方法获得了更加准确的纤维素特性粘度和聚合度。此外,还探讨了与空气接触时,不同溶解时间对纤维素铜乙二胺特性粘度的影响。该实验是纤维素相关材料的基本表征实验,学生可以了解纤维素的基本性质和溶解机理,以及高分子材料粘度的测定和粘度计的使用方法,还可以学习构建简单模型对各组分影响进行探讨。更多还原

【Abstract】 An improved experiment for determining the intrinsic viscosity of cellulose through the copper ethylenediamine method is introduced. In this method, lignin has a great impact on determination of the intrinsic viscosity of cellulose. In order to explore this issue, a cellulose-lignin model was constructed to discuss the influence of lignin content on intrinsic viscosity of cellulose. Moreover, an improved calculation method was used for cellulose in this model to obtain a more accurate intrinsic viscosity and degree of polymerization of cellulose. In addition, the impact of different dissolution times on the intrinsic viscosity of cellulose copper ethylenediamine when in contact with air was also discussed. This experiment is a basic characterization experiment of cellulose-related materials. By learning this experiment, students can understand the basic properties and dissolution mechanism of cellulose, as well as the determination of viscosity of polymer materials and the use of viscometer. They can also learn to build a simple model to explore the influence of different components.更多还原