The effect of the ocean water immersion and UV ageing on the dynamic mechanical properties of the PPS/glass fiber composites

Abstract

Nowadays, the poly(phenylene sulfide) thermoplastic matrix composites have being utilized by most of the aerospace companies in order to replace a great quantity of the components made of aluminum, thermoset composites, or both and it is the reason they are being strongly considered to be utilized into marine structures, however, are quite often exposed to the environmental conditions that can damage them irreversibly, minimizing their qualities and compromising their performance. Depending on the aviation industry policy and requirements to learn more about these possible damages and increase the performance and the safety, this work aims to evaluate how the salt water and the UV light radiation conditioning affect the viscoelastic properties of the PPS/glass fiber laminates. Those viscoelastic experiments were performed by a DMA instrument before and after to submit the specimens to the conditioning and the experiments results were compared. Additionally, the moisture absorption mechanism after immersion in the artificial ocean solution and the material surface analysis after UV conditioning were investigated. According to the results found in this work, it can be concluded that the PPS/glass fiber absorbed approximately 0.3% of moisture into artificial ocean water conditioning under 60 C and this thermoplastic laminate exhibits moisture absorption according to the Fick's law, since the n constant experimental value was around 0.5.

Moisture and temperature influence on mechanical behavior of PPS/buckypapers carbon fiber laminates

“…This means that, the specimens presented a weight gain during the exposure time since the water remains free over time and tends to penetrate in polymer matrix by the concentration gradient. Also, it initiates the relaxation process of the polymer chain and the hygrothermal filling of existing voids [35,36]. In this work, it was observed that after eight weeks of exposure in moisture environment the composites presented the follow average values of saturation points: the PPS/CF* laminate presented 0.165% and the PPS/BP/CF* laminate reached 0.307% of moisture, respectively.…”

Lightweight structural composites with electromagnetic applications

“…Moisture substantially affects the properties of fiber-reinforced plastic composites [9]. Water enters a composite material mainly by the process of diffusion.…”

“…This is probably due to the edge effects [5,[8][9][10][11]. This is probably due to the edge effects [5,[8][9][10][11].…”

“…Under a compressive load, thermoset composites usually present extensive and severe effects of delamination [5,[8][9][10][11]]. Initial failure can be easily observed when it occurs in a constrained region such as the tabbed region of a specimen following premature failure by means of end crushing.…”

Effect of crystallinity on CF/PPS performance under weather exposure: Moisture, salt fog and UV radiation

“…Some previous investigations on the GF/PPS behavior after UV/ condensation exposure are found. De Faria et al [31] observed color variation and cracking of the surface after 1900 h of UV exposure. Costa et al [32] verified not only color variation and cracking of the surface, but also a 3% reduction in the ILSS after 900 h of UV/ condensation conditioning.…”