Promoting the adhesion of high‐performance polymer fibers using functional plasma polymer coatings

Abstract

Plasma‐copolymerized functional coatings of acrylic acid and 1,7‐octadiene were deposited onto high strength, high modulus, poly‐p‐phenylene benzobisoxazole (PBO) fibers. X‐ray photoelectron spectroscopy (XPS) with trifluoroethanol derivatization confirmed that the PBO fibers were covered completely with the plasma copolymer and that the coating contained a quantitative concentration of carboxylic acid groups. Microdebond single filament adhesion and interlaminar shear strength (ILSS) tests were used to evaluate the interfacial strength of epoxy resin composites containing these functionalized PBO fibers. Both the interfacial shear strength (IFSS) obtained from single filament tests, and the ILSS of high volume fraction composites were a function of the surface functionality of the fibers so that there was a good correlation between ILSS and IFSS data. The tensile strengths of single fibers with or without coating were comparable, demonstrating that the fiber surface was not damaged in the plasma‐coating procedure. Indeed, the statistical analysis showed that Weibull modulus was increased. Therefore, plasma‐polymerized coatings can be used to control the interfacial bond between PBO fibers and matrix resins and act as a protective size for preserving the mechanical properties of the fibers. POLYM. COMPOS., 2009. © 2008 Society of Plastics Engineers

Evolution of Hydrophobicity in Plasma Polymerised 1,7‐Octadiene Films

“…1,7‐Octadiene (OD) is a liquid unsaturated hydrocarbon monomer widely used as a diluent hydrocarbon monomer in plasma copolymerisation . Recently an increasing number of studies have utilised plasma polymerised 1,7‐octadiene (ppOD) coatings as control hydrophobic surfaces in cell attachment experiments .…”

“…[8] 1,7-Octadiene (OD) is a liquid unsaturated hydrocarbon monomer widely used as a diluent hydrocarbon monomer in plasma copolymerisation. [9][10][11][12] Recently an increasing number of studies have utilised plasma polymerised 1,7octadiene (ppOD) coatings as control hydrophobic surfaces in cell attachment experiments. [13][14][15][16][17] These publications have however reported different water contact angles ranging from 758 to 908, which appear to be related to the different applied deposition conditions.…”

The effect of different grafting extent of PBO‐MoS2 hybrids on the tribological performance of TPI‐based composites at high temperatures

“…Thus, in order to increase the extent of bonding of fibers and polymers, it is significant to modify the surface state of the fiber. These modification processes can be classified into “physics” and “chemistry” methods, “physics” methods include plasma treatment, 1‐3 corona discharge, 4 irradiation treatment 5,6 ; “chemistry” methods include acid etching, 7 coupling agent treatment 8‐10 and chemical grafting 11‐13 . In comparison to the traditional multiphase fillers constituted by lubricating and enhancing agents, the self‐assembled hybrid had better dispersion and interfacial adhesion in the matrix.…”

Improvement of the interfacial adhesion between PBO fibers and PPESK matrices using plasma‐induced coating

“…Composites, which contain two or even more separate materials, combined with a macroscopic structural unit, have excellent properties 1. Nowadays, polymer composites have been extensively used in high‐performance polymer products 2. The rigid rod polymeric fiber poly( p ‐phenylene benzobisoxazole) (PBO), which belongs to a new class of high performance “rigid‐rod” PBZ materials, contains aromatic hetero‐cyclic rings which provide fine chemical resistance and ensure good tensile 3–7.…”