聚丁二酸丁二醇酯/纤维素纳米晶复合纤维增强机制

采用熔融纺丝法制备了聚丁二酸丁二醇酯(PBS)/纤维素纳米晶(CNC)复合纤维,重点研究了CNC的分散性、PBS与CNC间氢键作用、PBS分子取向、CNC沿轴向排布以及PBS相结晶度对复合纤维强度的影响。通过光学显微镜和场发射扫描电镜观察发现:高牵伸倍率下的复合纤维较低牵伸倍率下的复合纤维侧面更加平整、光滑,且高牵伸倍率下CNC列。红外光谱图证实了PBS与CNC用力。此外,在提高牵伸倍率时,PBS复合纤维结晶度增大,并且其声速值也明显提高。多因素协同导致PBS/CNC(质量比99/1)复合纤维经4倍牵伸后断裂强度达3.59 cN/dtex,远高于相同处理条件下的纯PBS纤维。

Reinforcing Mechanism of Polybutylene Succinate/Cellulose Nanocrystalline Composite Fiber

Polybutylene succinate(PBS)/cellulose nanocrystalline(CNC) composite fiber was prepared by melt spinning method. Effects of CNC dispersion, hydrogen bonding between PBS and CNC, PBS molecular orientation, CNC arrangement along PBS axis and PBS crystallinity on tensile strength of PBS/CNC composites fiber were investigated. Optical microscope and field emission scanning electron microscope images show that the composite fiber with high draft ratio is more smooth than that with low draft ratio. At high draft ratio, CNC shows better dispersion in PBS matrix and can arrange along PBS axis. Infrared spectroscopy confirmed hydrogen bonding effect between PBS chains and CNC, which contributing to enhance interfacial adhension between PBS and CNC components. In addition, crystallinity and the sound velocity of PBS composite fiber increase with draft ratio increasing. These factors synergetically lead to an increased tensile strength of 3.59 cN/dtex of PBS/CNC(mass ratio of 99/1) after drafting 4 times, which is much higher than that of neat PBS fiber.