Accelerated Aging Ultraviolet of a PET Nonwoven Geotextile and Thermoanalytical Evaluation

Materials

卷:15

Clovis Augusto Ribeiro¹  Marta Pereira da Luz²  Jefferson Lins da Silva³  Yara Barbosa Franco³  Clever Aparecido Valentin³  Marcelo Kobelnik³ 

[1] Departamento de Química Analítica, Universidade Estadual Paulista—UNESP, Araraquara 14801-970, Brazil;

[2] Department of Dam Safety and Technology, Furnas Centrais Elétricas S.A., BR153, km 510, Zona Rural, Aparecida de Goiânia 74923-650, Brazil;

[3] São Carlos School of Engineering-EESC, University of São Paulo—USP, São Carlos 13566-590, Brazil;

关键词: polyester;    nonwoven geotextile;    thermal analysis;    physical tests;   

DOI  :  10.3390/ma15124157

来源: DOAJ

【 摘 要 】

Nonwoven geotextiles are geosynthetic products that are highly susceptible to ultraviolet degradation because light can reach a large area of the material due to its fiber arrangement. Even with additives, which delay the degradation process, material decomposition still occurs, and therefore the product’s long-term durability can be affected. In this paper, the mechanical and thermal behavior of a commercial nonwoven polyester geotextile subjected to accelerated ultraviolet aging tests were evaluated. The deterioration was evaluated by comparing the physical properties (mass per unit area, thickness, and tensile strength) and thermal behavior (thermogravimetry—TG, thermomechanical analysis—TMA, and differential scanning calorimetry—DSC) before and after exposure times of 500 h and 1000 h. The results showed that the ultraviolet aging tests induced some damage in the polyester fibers, leading to the deterioration of their tensile strength. For 1000 h of exposure, in which the reduction was larger, scanning electron microscopy (SEM) found some superficial disruption of the fibers, indicative of damage. TG and DSC could not capture the effects of UV radiation on polymer degradation, unlike TMA. This latter technique was effective in showing the differences between specimens before and after UV exposure.

【 授权许可】

Unknown