芳纶Ⅲ沉析纤维的制备及结构与性能研究

Study on the Preparation, Structure, and Properties of Heterocyclic Aramid Ⅲ Fibrids

关键词:  杂环芳纶  芳纶Ⅲ沉析纤维  芳纶纸  形貌

Key Words:heterocyclic aramid  aramid Ⅲ fibrids  aramid paper  morphology

摘要:将芳纶Ⅲ聚合物溶液注入高速搅拌的凝固浴中制备芳纶Ⅲ沉析纤维，并采用湿法抄纸技术制备了芳纶Ⅲ原纸，研究了杂环单体含量、聚合物相对分子质量等因素对聚合物溶液存储稳定性、沉析纤维结构及形貌、芳纶Ⅲ原纸力学性能的影响。结果表明，杂环单体含量高于30%才能制备稳定的芳纶Ⅲ聚合物溶液，高于40%时制备的沉析纤维具有较大的长径比，适宜抄纸；聚合物相对分子质量对沉析纤维的形貌有较大的影响，芳纶Ⅲ聚合物溶液表观黏度宜控制为10 000~20 000 cP，比浓对数黏度为2.4~5.5 dL/g，得到的沉析纤维具有较高长径比和比表面积，进一步制备的芳纶Ⅲ原纸力学性能优异。

Abstract:The heterocyclic aramid Ⅲ frbrid was prepared by injecting heterocyclic aramid Ⅲ polymerization solution into the solidfication bath with high speed stirring. The heterocyclic aramid Ⅲ raw papers were further prepared via wet papermaking process. The effects of heterocyclic monomer content and polymer relative molecular weight on the storage stability of the heterocyclic aramid Ⅲ polymerization solution， the structure and morphology of the heterocyclic aramid Ⅲ fibrids were studied. The effects on the mechanical properties of the heterocyclic aramid Ⅲ raw papers were discussed. The results showed that the stable heterocyclic aramid Ⅲ polymerization solution could be prepared only when the heterocyclic monomer content was higher than 30%， and the fibrids prepared with heterocyclic monomer content higher than 40% had a larger ratio of length to diameter， which was suitable for papermaking. The polymer relative molecular weight had a great influence on the appearance of the fibrids. The fibrids prepared by the heterocyclic aramid Ⅲ polymerization solution with apparent viscosity in 10 000~20 000 cP， and the specific concentration logarithmic viscosity of 2.4~5.5 dL/g， had a higher ratio of length to diameter and specific surface area， and the further prepared heterocyclic aramid Ⅲ raw papers had excellent mechanical properties.