Advances in studies of thermal degradation of polymeric materials Part I. Literature studies

Abstract

Przedstawiono bieżące kierunki badań stabilności termicznej polimerów, ze szczególnym uwzględnieniem nowatorskich układów polimerowych: kompozytów i nanokompozytów, polimerów biodegradowalnych, biocydowych i do zastosowań specjalnych. Opisano ogólny mechanizm degradacji termicznej zachodzącej podczas przetwórstwa i podstawowe aspekty kinetyczne tego procesu. Omówiono przykłady badań właściwości termicznych wybranych tworzyw na bazie poliuretanów, żywic epoksydowych, kopolimerów kwasu akrylowego i poliestrów.

Lifetime Prediction Methods for Degradable Polymeric Materials—A Short Review

“…By extrapolation, it is possible to estimate, for a given temperature, the degree of material degradation after a specified time, or the time required to achieve a certain degree of degradation [ 76 ]. Many authors adopt different kinetic models and their corresponding conversion functions [ 77 , 78 ]. Methods using a combination of thermal analysis with other techniques, such as infrared analysis and mass spectroscopy of degradation products, have proved particularly useful [ 79 , 80 ].…”

Selected performance indices for assessment of polypropylene susceptibility to dyeing by pigments of different UV resistance

“…Due to constantly growing use of polymer materials (in many fields of economy) there is a need to identify the impact of external factors and the effects of processing on selected performance properties which eventually involves a necessity of continuous modification of the research methodology including identification of appropriate indices [9]. Aging processes, that is, all chemical and physical changes which lead to a change in functional qualities of utility polymers (especially esthetic, and mechanical ones), that occur in time, depend on both the base and auxiliary materials [5,13,14].…”

“…The possibility to control heat resistance (stability) of materials through the use of auxiliary materials is often difficult due to the impact of the processing complex conditions [14,19,20]. Some problems are caused by occurrence of a bigger number of auxiliary materials (a few additives at the same time, multibatch) and their possible synergy [10,18].…”

Preparation and characterization of polymer blends based on the wastes from automotive coverings

“…The thermostability of the polymers and composites depends on many factors, including the presence of low molecular weight substances, branching or crosslinking [21]. Polyethylene, like other high molecular weight organic compounds, exhibits limited resistance to high temperatures, resulting mainly from a specific energy of C C (346 kJ/mol) and C H (411 kJ/mol) chemical bonds [21,22], especially in the presence of oxygen.…”