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Pure Hydrolysis of Polyamides: A Comparative Study
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This study examined the hydrolytic degradation of different polyamide (nylon) types under various environmental conditions. Understanding how nylon degrades is relevant to microplastics research, as nylon fishing gear and synthetic textiles are significant sources of microplastic fibers in aquatic environments.
Nylon, also known as polyamides (PAs), undergoes local environmental degradation, leading to a decline in its mechanical properties over time. The degradation process is strongly influenced by the surrounding environment in which the polymer is utilized. PAs can experience various forms of degradation, such as thermal degradation, oxidation, hydrothermal oxidation, UV oxidation, and hydrolysis. It is crucial to understand each of these degradation mechanisms individually to better comprehend the degradation process of nylon. Although extensive research has been conducted on hydrolysis over the past few decades, there is currently no comprehensive review that consolidates the latest findings. This review analyzes the available characterization data and evaluates the changes in molecular weight, crystallinity, chemical structure, and mechanical properties of PAs that have aged in oxygen-free water at high temperatures. The primary objective is to gain a comprehensive understanding of the aging process of PAs in water without oxygen. Additionally, secondary information is provided, including the influence of fibers and additives in the polymer, hydrolysis susceptibility among PAs with longer aliphatic chains, correlation between different parameters, impact of acids, and important factors for determining the point at which PAs become brittle when subjected solely to hydrolysis.
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Recycling and Degradation of Polyamides
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This review covers methods for recycling and breaking down polyamide (nylon), a widely used engineering plastic whose growing production is creating serious pollution problems. Understanding how nylon degrades is relevant to the microplastics issue because polyamide fibers are one of the most common types of microplastics found in water, soil, and even human tissues.
Characterisation of microplastic fibres and their degradation under environmental conditions
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This study investigated how UV radiation and mechanical stress degrade common synthetic microfibers including polyester, nylon, and acrylic, which represent the largest fraction of microplastic pollution in aquatic environments. Understanding how fibers degrade helps predict their persistence and how their physical properties change as they age in the environment.
Photodegradation Processes and Weathering Products of Microfibers in Aquatic Environments
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Researchers conducted photodegradation experiments on three common microfiber types — polyester, nylon, and acrylic — to understand how they break down in aquatic environments under light exposure. They documented changes in surface morphology, polymer structure, and chemical properties over time, finding that each fiber type followed distinct degradation pathways. The study provides important insights into the environmental fate and secondary pollution potential of textile-derived microfibers.
Microplastic fibres from synthetic textiles: Environmental degradation and additive chemical content
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Researchers studied how common synthetic textile fibers — polyester, polyamide, and polyacrylonitrile — degrade in seawater and freshwater under UV light exposure. They found that these fibers release chemical additives as they break down, with polyester and polyamide releasing particularly concerning levels of plastic-related chemicals into the surrounding water.
Behaviour of different micro-plastics during degradation in fresh and sea waters, with focus on synthetic microfibers
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This conference abstract compares how different types of microplastics, especially synthetic fibers, degrade under freshwater versus seawater conditions. Understanding degradation rates and pathways is important for predicting the environmental persistence and ultimate fate of microplastics in different aquatic ecosystems.
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