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以离子液体氯化1-烯丙基-3-甲基咪唑([AMIM]Cl)为溶剂,采用双螺杆挤出机溶解并纺制了较高质量分数的纤维素纤维,测定了纤维素纤维的结构与性能以及纤维中[AMIMCl]残余质量分数,观察了纤维的微观形貌。结果表明:双螺杆挤出机能溶解并纺制较高质量分数的纤维素纤维,可达30%,纤维素纤维晶型由浆粕的Ⅰ型转变为Ⅱ型,纤维结晶度小于纤维素浆粕。成形过程中,纤维中的离子液体难于完全除去,导致纤维素纤维分解温度下降。实验范围内,纤维素质量分数为20%时,纤维断裂强度最高,为0.51cN/dtex。
A higher mass fraction of cellulose fibers was dissolved and spun using a twin-screw extruder using ionic liquid 1-allyl-3-methylimidazolium chloride ([AMIM] Cl) as a solvent. The structure and properties of [AMIMCl] and the residual mass fraction of the fiber were observed. The microstructure of the fiber was observed. The results showed that the twin-screw extruder could dissolve and spin higher quality fraction of cellulose fibers up to 30%. The cellulose fiber crystal type changed from type Ⅰ to type Ⅱ, and the crystallinity of cellulose fibers was lower than that of cellulose pulp . During the forming process, the ionic liquid in the fiber is difficult to remove completely, resulting in a decrease in the decomposition temperature of the cellulose fiber. Within the experimental range, the highest fiber breaking strength was 0.51cN / dtex when the cellulose mass fraction was 20%.