Polymer degradation - Wikipedia
Polymer degradation is the reduction in the physical properties of a polymer, such as strength, caused by changes in its chemical composition. Polymers and particularly plastics are subject to degradation at all stages of their product life cycle, including during their initial processing, use, disposal into the environment and recycling. [1]
The degradation in the region of 300 – 400 C is associated with scission of polymer chain at random along its length to form radicals. The olefinic double bonds at the chain ends formed due to disproportionation reaction
Polymer Degradation - an overview | ScienceDirect Topics
Polymer degradation is a process that brings changes in the properties (e.g., shape, color, tensile strength) by undergoing biological, chemical, or physical reactions that result in breaking bonds with further chemical transformations. These transformations mainly include chemical variations, bond breaking, and development of new functional ...
Review on the current status of polymer degradation: a microbial ...
2017年3月23日 · The starch-based polymer is favorable for microbial attack, and hydrolytic enzymes act on the polymer matrix to reduce their weight. Polymer made from starch or flax fiber shows greater biodegradability as compared to other synthetic polymers.
Environmental Degradation of Polymer-Based Composite …
2024年2月7日 · Chemical attack can result in structural alterations to the polymer matrix, leading to a decrease in mechanical properties and heightened vulnerability to other forms of degradation. This degradation is often marked by reduced stiffness, strength, and toughness, making the material more brittle and prone to failure under stress [ 43 ].
Degradation of Polymer Materials in the Environment and Its …
Chemical degradation involves the breaking of chemical bonds within the polymer chains, leading to changes in the material’s chemical structure and properties . This degradation can occur through several mechanisms, including photochemical degradation, thermo-oxidative degradation, and hydrolytic degradation.
Glass transition temperature The temperature at which polymer molecules cease being effectively locked into position and have sufficient rotational energy to be able to coil and uncoil.
Polymer Degradation - an overview | ScienceDirect Topics
Polymer degradation in broader terms includes biodegradation, pyrolysis, oxidation and mechanical, photolytic and catalytic degradation (Pielichowski and Njuguna, 2005). Because of their chemical structure, polymers are vulnerable to harmful effects in the environment.
Chapter 10 Polymer Degradation and Oxidation: An Introduction
2008年1月1日 · Polymer chains can be susceptible to breakage by a variety of mechanisms. Degradation can be oxidative, shear-induced, hydrolytic, by thermal scission, or by radiation attack from UV or other sources, or combinations of these or indeed other mechanisms.
Polymer Degradation - SpringerLink
Polymers degrade by several different mechanisms, depending on structure and exposure conditions. Degradation results from an irreversible change which leads eventually to failure. The most common types of degradation occur through chemical reactions, but there are a few important examples of degradation resulting only from physical changes.
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