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针对国产间位芳纶纸力学性能不足的问题,采用芳纶1414(聚对苯二甲酰对苯二胺)短切纤维与芳纶1313(聚间苯二甲酰间苯二胺)浆粕复合,制备芳纶1414纤维/1313浆粕复合纸,研究不同温度下芳纶1414纤维/1313浆粕复合原纸的热压性能,分析纸张的强度性能;采用SEM、压汞仪和FTIR研究芳纶1414纤维/1313浆粕复合纸的内部结构变化。阐述热压温度对芳纶1414纤维/1313浆粕复合纸热压过程中短切纤维与浆粕之间的相互作用以及微区结合特征的影响。结果表明:芳纶1414纤维/1313浆粕复合纸在热压温度为280℃、热压时间为6min、热压压力为15 MPa条件下,短切纤维与浆粕之间黏结状态良好,自制芳纶1414纤维/1313浆粕复合纸孔隙率为23.21%,其抗张指数最大值为212.2N·m·g~(-1),为Nomex T410纸强度的两倍。FTIR结果表明,随着热压温度的升高,纸张中未形成新的化学键,芳纶分子间氢键缔合程度明显增大,是芳纶1414纤维/1313浆粕复合纸强度提高的主要原因。
Aramid fiber paper for the lack of mechanical properties of the problem, the use of aramid 1414 (poly (p-phenylene terephthalamide) chopped fiber and aramid 1313 (poly-m-isophthalamide) Aramid 1414 fiber / 1313 pulp composite paper was prepared to study the hot pressing properties of aramid 1414 fiber / 1313 pulp composite base paper at different temperatures, and the strength properties of the paper were analyzed. SEM, mercury porosimetry and FTIR Changes in the internal structure of 1414 fiber / 1313 pulp composite paper. The effect of hot pressing temperature on the interaction between the chopped fiber and the pulp and the micro-zone bonding characteristics during the hot-pressing process of the aramid 1414 fiber / 1313 pulp composite paper was illustrated. The results showed that the bond between aramid fiber 1413 fiber and pulp was good under the condition of hot pressing temperature of 280 ℃, hot pressing time of 6min and hot pressing pressure of 15 MPa. The porosity of fiber 1414 fiber / 1313 pulp composite paper is 23.21%, and its maximum tensile index is 212.2N · m · g -1, which is twice that of Nomex T410 paper. The results of FTIR showed that as the hot pressing temperature increased, no new chemical bond was formed in the paper and the degree of hydrogen bonding between aramid fibers increased obviously, which was the main reason for the increase of strength of aramid fiber 1413/1313 pulp composite paper .