High-Performance Polyimide Filaments and Composites Improved by O2 Plasma Treatment

Abstract

Abstract:Interface issues urgently need to be addressed in high-performance fiber reinforced composites. In this study, different periods of O 2 plasma treatment are proposed to modify twist-free polyimide (PI) filaments to improve hydrophilicity and mechanical and interfacial properties. Feeding O 2 produces chemically active particles to modify the filament surface via chemical reactions and physical etching. According to the X-ray photoelectron spectroscopy (XPS) results, the PI filaments exhibit an 87.16% increase in O/C atomic ratio and a 135.71% increase in the C-O functional group after 180 s O 2 plasma treatment. The atomic force microscope (AFM) results show that the root mean square roughness (Rq) of the treated PI filaments increases by 105.34%, from 38.41 to 78.87 nm. Owing to the increased surface oxygenic functional groups and roughness after O 2 plasma treatment, the contact angle between treated PI filaments and water reduces drastically from the pristine state of 105.08 • to 56.15 • . The O 2 plasma treated PI filaments also demonstrate better mechanical properties than the pristine PI filaments. Moreover, after O 2 plasma treatment, the adhesion between PI filaments and poly(amic acid) (PAA) is enhanced, and the tensile strength of the polyimide/poly(amic acid) (PI/PAA) self-reinforced composites increases from 136 to 234 MPa, even causing the failure mode of the composite changes from adhesive failure to partly cohesive failure.

Design, synthesis, characterization, and cytotoxicity of PCL/PLGA scaffolds through plasma treatment in the presence of pyrrole for possible use in urethral tissue engineering

“…This can be explained by nitrogen bond degradation from the polymerized pyrrole on the scaffold surface, during the first 5 min of plasma treatment. 45 In summary, polymerization of pyrrole starts after 5 min, but the PCL/PLGA matrix was simultaneously degraded. Then, other functional groups are formed due the degradation of the pyrrole.…”

Effect of Beta Radiation on the Quality of the Bonded Joint for Difficult to Bond Polyolefins

“…This surface modification treatment led to significant reductions in wetting contact angles, which ultimately led to the significant increase in the bond strength of the bonded joints. The positive effect of these surface-modification methods on adhesive properties was described in many papers [6,7,8,9,10,11], and it is clear that these methods increased surface energies and improved surface-layer wettability, thus resulting in improved adhesive qualities, increased strength, and improved glued-bond quality. The influence of surface treatments of polymeric plasma filaments at atmospheric pressure on adhesion in matrices of rubber mixtures and other materials was addressed in several papers [12,13,14,15,16].…”

Synthesis and Properties of Plasma-Polymerized Methyl Methacrylate via the Atmospheric Pressure Plasma Polymerization Technique

“…The creation of new polymer materials would require novel technological developments. Recently, there have been a number of interesting reports concerning an aerosol-through-plasma (ATP) technique for generating particulate materials [7,8,9,10,11,12,13,14]. In brief, this technology consists of passing aerosols through various plasma systems, particularly radio frequency (RF) and microwave, to create particulates, nanoparticles, and thin films.…”