| In industrial production,fibers treated by plasma are usually not in single form but in a certain form of compaction,namely yams or fabrics.So the compaction of the fibers may have potential influence on the efficiency of plasma treatment.In this study,a control group and other four groups of aramid fiber bundles(Kevlar129) with different numbers of twists 0/10cm(0T), 10/10cm(10T),20/10cm(20T),and 30/10cm(30T) representing different compactions were treated by atmospheric pressure plasma jet(APPJ) and dielectric barrier discharge plasma(DBD) to see its influence on surface wettability and Interracial shear strengths(IFSS) to epoxy which are determined using capillary rise test and micro-bond pull out test respectively.Complementary information was obtained by three-dilnension digital microscope and atomic force microscopy (AFM) analysis and X-ray photoelectron spectroscopy(XPS) analysis.After plasma treatment, XPS analysis and AFM analysis showed the increase of polar groups and the fiber surface toughness.For APPJ treatment,the capillary rise test showed that the wicking performances of all four groups were improved compared with the control group and the wettability decreased with the increase of yarn compaction,the capillary rise height of 0T group increased by 21.9%over the 30T group;Results also revealed that the IFSS decreased with the increasing of the fiber bundle compaction and the IFSS of 30T group dropped by 20%compared with the 0T group.For DBD treatment,the capillary rise height of 0T group increase 15.9%over 30T group,but there is no significant differences between the other three(10T,20T,30T) groups.The IFSS of DBD 30T group dropped by 21.2%compared with 0T group.When yarn compaction is at medium level like 10T,the IFSS of APPJ 10T group is 7.2%higher than that of DBD 10T group while when the yarn compaction is at low level(0T) or high level(30T),the difference between APPJ and DBD is less than 5%. |
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