Abstract Polymer composites in marine structures that operate under seawater environment may be seriously affected, reducing durability estimates. This work aims at evaluating the effect of seawater exposure at 80 °C for 7–28 days on filament-wound glass fiber/epoxy composite cylinders partially cured by passing saturated steam through them just after winding seeking a faster curing route. The winding angle is varied (±55, ±65 and ± 75) and some of the cylinders are later post-cured for comparison. The unaged partially cured specimens do not reach complete curing, with a glass transition temperature (Tg) of 132 °C, below the Tg for the other samples (154–159 °C). Fully cured cylinders present mechanical properties slightly higher than partially cured ones. Moreover, aging in seawater for 7 days enhances the cross-linking degree of epoxy, with a positive effect on both hoop tensile strength and stiffness. Aging is, however, not critical for the radial compressive properties.

中文翻译：

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固化和海水老化对玻璃/环氧树脂缠绕复合材料圆柱的机械、热和物理性能的影响

摘要 在海水环境下运行的海洋结构中的聚合物复合材料可能会受到严重影响，从而降低耐久性估计。这项工作旨在评估在 80 °C 的海水中暴露 7-28 天对纤维缠绕玻璃纤维/环氧树脂复合材料圆柱体的影响，这些圆柱体在缠绕后立即通过饱和蒸汽通过它们而部分固化，以寻求更快的固化途径。缠绕角是变化的（±55、±65 和±75），一些圆柱体后来进行了后固化以进行比较。未老化的部分固化样品未达到完全固化，玻璃化转变温度 (Tg) 为 132 °C，低于其他样品的 Tg (154–159 °C)。完全固化的圆柱体的机械性能略高于部分固化的圆柱体。此外，在海水中老化7天提高了环氧树脂的交联度，对箍抗拉强度和刚度都有积极影响。然而，老化对于径向压缩特性并不重要。