材料期刊网

利用物理检测、SEM观察、XPS检测等方法探究了打浆前后纤维基聚氨酯复合材料的物理指标、表面形态以及成键情况,分析了纸浆细纤维化对纤维基聚氨酯复合材料性能的影响。通过对纤维基聚氨酯复合材料的物理性能检测分析可知,当咪唑-TDI-PEG400聚氨酯预聚体乳液加入量为10%时,随着浆料打浆度的提升,复合材料的抗张指数、湿抗张指数、耐折度、撕裂指数逐渐升高。当浆料打浆度为55°SR时,复合材料的抗张指数、湿抗张指数、耐折度、撕裂指数分别为空白样品的1.06、9.75、1.12、1.12倍。通过SEM也可以观察到,打浆度越高,纤维间的膜状包裹以及纤维间的桥接也逐渐增加。最后通过XPS表征抄片表面价键结合状态,发现随着打浆度的提升,抄片表面的氨基甲酸酯键含量逐渐提高。在打浆度为75°SR时,氨基甲酸酯的含量为1.63%,为10°SR抄片的6.30倍。

In order to understand the influence of fiber beating on the synthesis of polyurethane from plant fi- bers, its physical properties, surface feature, valence bonds were tested. Based on the analysis of physical pro- perties on the fiber based polyurethane composites, the dry tensile index, wet tensile index, folding endurance and tear index all increased with the increase of beating degree, when the adding dosage of imidazole-TDI- PEG400 （called ITP400 for short） was 10% （of absolutely dry pulp）. When the beating degree was 55°SR, the dry tensile index, wet tensile index, folding endurance and tear index of the obtained composite increased by 1.06, 9.75, 1.12 and 1.12 times. The SEM observation of treated composite reveals the dosage of needles and mem- brane, which may form crosslinking between fibers, was increased with the increase of beating degree. The XPS characteristics show that the content of urethane bond was also increased with the increase of beating degree. The content of urethane bond was 1.63% when the beating degree of composite was 75°SR, which is 6.30 times more than composite of 10°SR.