苯代三聚氰胺改性三聚氰胺甲醛/聚乙烯醇纤维的结构与性能EI北大核心CSCD

通过湿法纺丝,分别制备了湿拉伸倍数为1.0~1.3倍的三聚氰胺甲醛/聚乙烯醇(MF/PVA)纤维和苯代三聚氰胺(BG)改性MF/PVA纤维。采用红外光谱仪、元素分析仪、极限氧指数(LOI)仪、扫描电子显微镜、热重分析仪和纤维强伸度仪表征对比了BG改性前后MF/PVA纤维的结构和性能变化。结果表明,湿法纺丝可制得结构均匀、表面附着有MF颗粒的MF/PVA纤维及BG改性纤维;随纤维湿拉伸倍数的增大,改性前后纤维的氮流失率都明显增加,阻燃性能和热稳定性能变差,而纤维力学性能增强。加入BG改性后,MF/PVA纤维的氮流失率明显降低,阻燃性能和耐热性能变好,纤维强度有所下降,但纤维韧性明显增大。湿拉伸1.3倍的BG改性MF/PVA纤维,其LOI值为29.1%,纤维的拉伸强度和断裂伸长率分别为2.39cN/dtex和5.66%。

Structures and Properties of Benzoguanamine Modified Melamine Formaldehyde/Polyvinyl Alcohol Fibers

Melamine formaldehyde/polyvinyl alcohol (MF/PVA) fibers and benzoguanamine (BG) modified MF/ PVA fibers were made under the wet stretch ratio of 1.0～1.3 by wet spinning.The difference in structures and properties between MF/PVA fibers and BG modified fibers was investigated by Fourier transform infrared (FT-IR) spectrometer,elemental analyzer (EA),limiting oxygen index (LOI),scanning electron microscope (SEM),thermogravimetric analyzer (TGA) and tensile tester.The results show that uniform MF/PVA fibers and BG modified fibers could be prepared by wet spinning process,and some MF particles are adhered on the surface of fibers.When the wet stretch ratio increases from 1.0 to 1.3,the nitrogen loss rate and tensile strength of both fibers increase,the flame retardant performance and thermal stability of fibers become worse.After BG modification,the nitrogen loss rate of MF/PVA fibers decreases,the flame retardant performance and thermal stability of fibers become better,the tensile strength of fibers decreases while their breaking elongation obviously incresases.When the wet stretch ratio is 1.3,the LOI value of BG modified MF/PVA fibers is 29.1％,the tensile strength and breaking elongation of fibers are 2.39 cN/dtex and 5.66 ％,respectively.