Research on the aging mechanism of polypropylene nonwoven geotextiles under simulated heavy metal aging scenarios

IF 4.7 1区 工程技术 Q1 ENGINEERING, GEOLOGICAL
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Abstract

We conducted accelerated aging experiments on two types of polypropylene (PP) nonwoven geotextiles (filament geotextile and staple fiber geotextile), immersing them in five different simulated liquids at temperatures of 25 °C, 55 °C, and 85 °C for 200 days. At 85 °C and a pH of 1, the tensile strength and elongation at break of PP filament materials decreased by 95% and 86%, respectively. The presence of heavy metals(arsenic and cadmium), speeds up the aging process in both types of PP geotextiles. Under identical conditions, these heavy metals can increase the loss of tensile strength in geotextiles by more than 7% in 200 days. Increases in temperature, acidic environment, and heavy metal concentration all contribute to faster aging of these geotextiles. Although filament geotextiles exhibit higher tensile strength and elongation at break, staple fiber geotextiles show a lower rate of tensile strength loss during aging and better maintain their tensile strength in high-temperature acidic conditions. During the aging process, cross-linking and recrystallization occur, both of which control the aging rate and the formation of microplastics.

模拟重金属老化情景下聚丙烯无纺土工布的老化机理研究
我们对两种聚丙烯(PP)非织造土工织物(长丝土工织物和短纤维土工织物)进行了加速老化实验,将它们浸泡在温度分别为 25 ℃、55 ℃ 和 85 ℃ 的五种不同模拟液体中 200 天。在 85 °C 和 pH 值为 1 的条件下,聚丙烯长丝材料的拉伸强度和断裂伸长率分别下降了 95% 和 86%。重金属(砷和镉)的存在加速了两种聚丙烯土工织物的老化过程。在相同条件下,这些重金属会使土工织物在 200 天内的拉伸强度损失增加 7% 以上。温度、酸性环境和重金属浓度的增加都会加快这些土工织物的老化速度。虽然长丝土工织物的拉伸强度和断裂伸长率较高,但短纤维土工织物在老化过程中的拉伸强度损失率较低,而且在高温酸性条件下能更好地保持拉伸强度。在老化过程中,会发生交联和再结晶现象,这两种现象都会控制老化速度和微塑料的形成。
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来源期刊
Geotextiles and Geomembranes
Geotextiles and Geomembranes 地学-地球科学综合
CiteScore
9.50
自引率
21.20%
发文量
111
审稿时长
59 days
期刊介绍: The range of products and their applications has expanded rapidly over the last decade with geotextiles and geomembranes being specified world wide. This rapid growth is paralleled by a virtual explosion of technology. Current reference books and even manufacturers' sponsored publications tend to date very quickly and the need for a vehicle to bring together and discuss the growing body of technology now available has become evident. Geotextiles and Geomembranes fills this need and provides a forum for the dissemination of information amongst research workers, designers, users and manufacturers. By providing a growing fund of information the journal increases general awareness, prompts further research and assists in the establishment of international codes and regulations.
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