超高分子量聚乙烯纤维表面改性的研究进展

介绍了超高贫子量聚乙烯(UHMWPE)纤维的各种表面改性方法,如低温等离子体改性、辐照接枝改性、化学氧化法改性等,重点讨论了这些方法对纤维复合材料的粘接性能和力学性能的影响,并对主要的纤维表面改性方法所具备的工艺特点、处理效果以及成本等作了对比分析,特别关注了近年来UHMWPE纤维的各种表面改性技术的进展,介绍了改性UHMWPE纤维的性能表征方法,对超高分子量聚乙烯纤维表面改性技术的工业化应用提出建议.     

处理剂对扁平腈纶性能的影响

采用处理剂对扁平腈纶进行浸渍试验,探讨了处理剂的种类及质量配比对扁平腈纶性能的影响。结果表明:烷基醚磷酸酯(3#)和烷基聚氧乙烯醚(4#)组成的复配处理剂适合扁平腈纶的生产,其中3#可使纤维具有良好的滑爽性,4#可提高纤维的抗静电性;随着复配处理剂中4#含量的增加,纤维的上染率减小,纤维的比电阻值降低;当复配处理剂3#/4#质量比为1/3时,扁平腈纶上染率达到81%,纤维比电阻值为8.04×106Ω.cm;纤维具有较好的白度,手感滑爽,蓬松性和抗静电效果良好。     

Deposition of Thin Titania Films by Dielectric Barrier Discharge at Atmospheric Pressure

A homogeneous atmospheric pressure dielectric barrier discharge is studied. It is in argon with small admixtures of titanium tetrachloride vapour and oxygen for the deposition of thin titania films on glass substrates. A special electrode configuration was applied in order to deposit the titania film uniformly. The sustaining voltage （6 kV to 12 kV）, current density （about 3 mA/cm^2） and total optical emission spectroscopy were monitored to characterize the discharge in the gap of 2 mm. Typical deposition rates ranged from approximately 30 nm/min to 120 nm/min. The film morphology was investigated by using scanning electron microscopy （SEM） and the composition was determined with an energy dispersive x-ray spectroscopy （EDS） analysis tool attached to the SEM. The crystal structure and phase composition of the films were studied by x-ray diffraction （XRD）. Several parameters such as the discharge power, the ratio of carrier gas to the precursor gas, the deposition time on the crystallization behavior, the deposition rate and the surface morphology of the titania film were extensively studied.