棉纤维碱法蒸煮时金属离子对纤维素聚合度的影响

Effect of Metal Ions on the Viscosity of Cellulose in Cotton Fiber Cooking with Alkali

中文关键词:  纤维素  碱性降解  金属离子  碱法蒸煮  黏度

Key Words:cellulose  alkaline degradation  metal ions  alkaline cooking  viscosity

中文摘要:

      在不同金属离子存在的条件下,对脱脂棉纤维进行了碱法蒸煮,并测定蒸煮后棉纤维聚合度。结果表明,K⁺在一定程度上会促进棉浆中纤维素的降解,而Mg²⁺、Ca²⁺和Fe²⁺在一定程度上抑制了纤维素的降解。

Abstract:

      Similar to alkaline pulping, absorbent cotton was cooked by alkali in this experiment. This paper introduced the experiment conditions.The effect of different metal ions (K⁺, Mg²⁺, Ca²⁺ and Fe²⁺) on alkaline degradation of cellulose was studied. The copper ethylenediamine (CED) method was used to measure the viscosity of absorbent cotton pulp, then the degree of polymerization (DP) of the cellulose was derivated. The results indicated that K+ promotes alkaline degradation of cellulose in a certain degree; however, Mg²⁺, Ca²⁺ and Fe²⁺ have the opposite effects on the absorbent cotton fiber.