Chloé Jost , Maxime Lacuve , Servane Haller , Eliane Espuche , Xavier Colin
{"title":"热氧化老化对硫交联EPDM结构及输水性能的影响","authors":"Chloé Jost , Maxime Lacuve , Servane Haller , Eliane Espuche , Xavier Colin","doi":"10.1016/j.polymdegradstab.2025.111210","DOIUrl":null,"url":null,"abstract":"<div><div>Ethylene Propylene Diene Monomer (EPDM) was sulfur-crosslinked and aged in air at 130°C to study the impact of thermo-oxidative aging on the polymer structure and water sorption properties. The oxidized functions formed during aging were identified and titrated by infrared spectroscopy. Density and swelling measurements performed on aged samples showed an increase in polymer density due to oxygen grafting, and a decrease in swelling assigned to a cross-linking phenomenon. This last phenomenon was confirmed by an increase in the glass transition temperature. Concerning water transport properties, it was evidenced that, with the creation of oxidized functions and the decrease in molecular mobility, the water diffusion slowed down, while the amount of sorbed water increased. Finally, the sorption isotherms obtained for EPDM before and after aging were modelled with a good accuracy by the Park's and the GAB's models. Both models led to the conclusion that aging mainly affects the polymer affinity with water, without modifying the mean size of the water clusters evidenced at high water activity.</div></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":"234 ","pages":"Article 111210"},"PeriodicalIF":7.4000,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence of thermo-oxidative aging on the structure and the water transport properties of sulfur-crosslinked EPDM\",\"authors\":\"Chloé Jost , Maxime Lacuve , Servane Haller , Eliane Espuche , Xavier Colin\",\"doi\":\"10.1016/j.polymdegradstab.2025.111210\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>Ethylene Propylene Diene Monomer (EPDM) was sulfur-crosslinked and aged in air at 130°C to study the impact of thermo-oxidative aging on the polymer structure and water sorption properties. The oxidized functions formed during aging were identified and titrated by infrared spectroscopy. Density and swelling measurements performed on aged samples showed an increase in polymer density due to oxygen grafting, and a decrease in swelling assigned to a cross-linking phenomenon. This last phenomenon was confirmed by an increase in the glass transition temperature. Concerning water transport properties, it was evidenced that, with the creation of oxidized functions and the decrease in molecular mobility, the water diffusion slowed down, while the amount of sorbed water increased. Finally, the sorption isotherms obtained for EPDM before and after aging were modelled with a good accuracy by the Park's and the GAB's models. Both models led to the conclusion that aging mainly affects the polymer affinity with water, without modifying the mean size of the water clusters evidenced at high water activity.</div></div>\",\"PeriodicalId\":406,\"journal\":{\"name\":\"Polymer Degradation and Stability\",\"volume\":\"234 \",\"pages\":\"Article 111210\"},\"PeriodicalIF\":7.4000,\"publicationDate\":\"2025-04-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Polymer Degradation and Stability\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0141391025000412\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"2025/1/21 0:00:00\",\"PubModel\":\"Epub\",\"JCR\":\"Q1\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Degradation and Stability","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141391025000412","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"2025/1/21 0:00:00","PubModel":"Epub","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
Influence of thermo-oxidative aging on the structure and the water transport properties of sulfur-crosslinked EPDM
Ethylene Propylene Diene Monomer (EPDM) was sulfur-crosslinked and aged in air at 130°C to study the impact of thermo-oxidative aging on the polymer structure and water sorption properties. The oxidized functions formed during aging were identified and titrated by infrared spectroscopy. Density and swelling measurements performed on aged samples showed an increase in polymer density due to oxygen grafting, and a decrease in swelling assigned to a cross-linking phenomenon. This last phenomenon was confirmed by an increase in the glass transition temperature. Concerning water transport properties, it was evidenced that, with the creation of oxidized functions and the decrease in molecular mobility, the water diffusion slowed down, while the amount of sorbed water increased. Finally, the sorption isotherms obtained for EPDM before and after aging were modelled with a good accuracy by the Park's and the GAB's models. Both models led to the conclusion that aging mainly affects the polymer affinity with water, without modifying the mean size of the water clusters evidenced at high water activity.
期刊介绍：
Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology.
Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal.
However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.
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