2018 DEC 7 (VerticalNews) -- By a News Reporter-Staff News Editor at Chemicals & Chemistry -- Current study results on Polymer Research have been published. According to news reporting originating from Qiqihar, People's Republic of China, by VerticalNews correspondents, research stated, "Phase morphology and phase separation behavior are always important factors affecting polymer blends' properties. Here, we employed FTIR imaging technique and thermomechanical analysis (TMA) to characterize the phase morphology and phase separation behavior of ultra-high molecular weight polyethylene (UHMWPE)/recycled-polyamide 6 (R-PA6) blends, which were prepared via extrusion using high-density polyethylene-graft-maleic anhydride (HDPE-g-MAH) as the compatibilizer."
In this paper, the effects of modified long ultra-high molecular weight polyethylene (UHMWPE) fibers on the mechanical properties of its rigid polyurethane (RPU) plastic were investigated. The UHMWPE fibers were modified by chromic acid, and the physical and chemical changes of the fiber surface were characterized by fourier transform infrared (FTIR), scanning electron microscopy (SEM) and contact angle test. The rigid polyurethane composites were prepared with 1wt% original and modified UHMWPE fibers. Tensile and impact tests of the composites were studied, and the results showed that the modified UHMWPE fibers having a more positive effect on the mechanical properties of the composites than those of original UHMWPE fibers. The section morphology of specimens was investigated using SEM， and it was found that the interface bonding between the modified fibers and RPU matrix was better. The loss modulus and loss factor of RPU composites were found to decrease reinforced with the modified UHMWPE fibers.
Thermoplastic fiber metal laminate (TFML) is a new hybrid composite material, which is a combination of sandwiched metal and complete thermoplastic fiber reinforced polymer (FRP). Due to its superior properties contributed from the unique combination of metal and FRPs, it has been applied in various advanced fields, like aerospace, and automotive. However, poor adhesion between inhomogeneous material surfaces of fiber, metal, and matrix in TFML makes the whole system weaker. In this work, the Ti6Al4V (titanium alloy) and ultrahigh molecular weight polyethylene fiber (UHMWPE) reinforced thermoplastic (Elium) polymeric composite were combined together to form a TFML. Fiber surface functionalization by PDA (polydopamine) coating with MWCNT (Multiwalled carbon nanotubes) has been adopted to enhance the bonding between the fiber and matrix. Ti6Al4V metal surface treatment by anodization with postprocessing of etching and annealing process has been adopted to enhance the interfacial bonding between metal thermoplastic composite interface (MTCI). The double cantilever beam test was utilized to evaluate the G 1C (Mode I interlaminar fracture toughness at MTCI) for the TFML sample with fiber surface functionalization and metal surface treatment. The result shows, after metal surface treatment, the average G 1C can be immediately increased from 0.25 kJm 2 (pristine titanium alloy with pristine fiber) to 1.57 kJm 2 for surfacetreated titanium alloy with pristine fiber. The PDA only coating for UHMWPE fiber enhanced the G 1C from 1.57 kJm 2 to 1.84 kJm 2 . PDA fiber surface functionalization with MWCNT coating enhanced the G 1C further to 2.54 kJm 2 .
Argon ion sputtering at various energies in the range of 5005000 eV is performed on polymer composites of ultrahigh molecular weight polyethylene (UHMWPE) with 4.6 wt% graphene nanoplatelets (GNPs). Xray photoelectron spectroscopy (XPS) shows that irradiation above 3000 eV causes an abrupt transition from tetrahedral sp 3 into planar sp 2 carbon in the blank polyethylene surface. This graphitization process, as well as the formation of certain oxygen groups after the subsequent exposure to air, is delayed by graphene in the composites. Besides, both XPS and Raman spectroscopy indicate that a part of the sp 2 graphene network is transformed into sp 3 carbon defects by irradiation. Surface hardness and Youngs modulus increase by 30100% in blank polyethylene and the composites upon irradiation. The surface electrical resistance of polyethylene decreases from 10 15 to 10 8 by sputtering at 5000 eV. Composites that are consolidated at low temperature (175 C) experience a transition from insulating (10 15 ) to conducting (10 4 ) in a narrow range of Ar sputtering energies, while for a high consolidation temperature (240 C) the transition is not observed. This research provides information on the induced interaction mechanisms between graphene and a polymer matrix upon ion beam irradiation.