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将棉浆粕纤维素溶解在离子液体([Bmim]Cl)中获得纤维素/[Bmim]Cl均相溶液后,在4-二甲氨基吡啶的催化作用下,通过纤维素与月桂酰氯的酰化反应制备了月桂酸纤维素酯(LACE)。采用FT-IR、1H NMR、XRD、TG等表征方法研究了产物结构及热稳定性;考察了产物取代度的影响因素;并选择具有不同取代度的LACE溶解在CHCl3中配成不同浓度的制膜液,采用延流法制膜,通过考察制膜条件与薄膜力学性能的关系以及薄膜形貌特征,研究了LACE的成膜性能。结果表明:95℃下,反应物以物质的量比为n(AGU)∶n(DMAP)∶n(LC)=1∶0.03∶3投料并反应4 h,所得产物具有较高取代度,在非极性溶剂中溶解性能优良,且无需加入增塑剂就可模塑成型。
After cotton pulp cellulose is dissolved in ionic liquid ([Bmim] Cl) to obtain a homogeneous solution of cellulose / [Bmim] Cl, the reaction between the cellulose and the acyl lauroyl chloride under the catalysis of 4-dimethylaminopyridine The reaction of cellulose laurate (LACE) was prepared. The structure and thermal stability of the product were characterized by FT-IR, 1H NMR, XRD and TG. The influencing factors of the degree of product substitution were investigated. The LACE with different degree of substitution was dissolved in CHCl3 to make the mixture with different concentrations Membrane fluid, the use of delayed flow method membrane, film conditions by investigating the relationship between the film and the mechanical properties of the film morphology, film properties of LACE studied. The results showed that when the reactant was fed at a molar ratio of n (AGU): n (DMAP): n (LC) = 1: 0.03: 3 at 95 ℃ for 4 h, the obtained product had higher degree of substitution. Excellent solubility in non-polar solvents and molding without the need for plasticizers.