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白蜡木热改性环境、温度和时间对纤维素质量、平均聚合度的影响

来源：花匠小妙招时间：2025-03-02 08:56

白蜡木热改性环境、温度和时间对纤维素质量、平均聚合度的影响

摘要

白蜡木热改性环境、温度和时间对纤维素质量、平均聚合度的影响采用排粒径色谱法(HPLC)测定了纤维素的重量平均聚合度。该聚合物采用k

rschner- hoffer法从白蜡木(Fraxinus excelsior L.)中分离得到。木材在不同的环境(氮气，蒸汽和空气)中进行热改性，温度为190°C，改性时间为2,6和10小时。根据所使用的厌氧气氛，在氮气环境中获得的纤维素重量平均聚合度最高，其次是蒸汽和空气。观察了改性时间对质量平均聚合度的影响。木材在改性2小时、6小时和10小时时获得最高值。原生木材的聚合程度最高。根据得到的结果，可以得出结论，对于所研究的材料，在给定的木材改性温度下，氧化和降解反应的发生取决于环境和时间。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Influence of environment, temperature and time of the thermal modification of ash wood (Fraxinus excelsior L.) on the cellulose weight average degree of polymerization

Influence of environment, temperature and time of the thermal modification of ash wood (Fraxinus excelsior L.) on the cellulose weight average degree of polymerization . Using the size-exclusion chromatography (HPLC SEC) method, the weight average degree of cellulose polymerization was determined. The polymer was isolated by the Kürschner-Hoffer method from ash wood (Fraxinus excelsior L.). The wood was thermally modified in different environments (nitrogen, steam and air) at 190°C and modification times of 2, 6 and 10 hours. Depending on the anaerobic atmosphere used, the highest values of the weight average degree of cellulose polymerization were obtained for the nitrogen environment, followed by steam and air. The effect of modification time on the weight average degree of polymerization was observed. The highest values were obtained for wood modified at 2 hours, then 6 and 10 hours of modification. The native wood showed the highest degree of polymerization. On the basis of the results obtained, it can be concluded that for the material studied the oxidation and degradation reactions occurring depend on the environment and time for a given temperature of wood modification.

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