Tertyshnaya Yulia V, Karpova Svetlana G, Podzorova Maria V
Department of Biological and Chemical Physics of Polymers, Emanuel Institute of Biochemical Physics, Russian Academy of Sciences, 4 Kosygina Str., 119334 Moscow, Russia.
Department of Chemistry of Innovative Materials and Technologies, Plekhanov Russian University of Economics, 36 Stremyanniy, 117997 Moscow, Russia.
Polymers (Basel). 2025 Jul 31;17(15):2102. doi: 10.3390/polym17152102.
Ozone is a powerful destructive agent in the oxidative process of polymer composites. The destructive ability of ozone depends primarily on its concentration, duration of exposure, the type of polymer, and its matrix structure. In this work, nonwoven PLA/NR fibers with natural rubber contents of 5, 10, and 15 wt.% were obtained, which were then subjected to ozone oxidation for 800 min. The effect of ozone treatment was estimated using various methods of physicochemical analysis. The visual effect was manifested in the form of a change in the color of PLA/NR fibers. The method of differential scanning calorimetry revealed a change in the thermophysical characteristics. The glass transition and cold crystallization temperatures of polylactide shifted toward lower temperatures, and the degree of crystallinity increased. It was found that in PLA/NR fiber samples, the degradation process predominates over the crosslinking process, as an increase in the melt flow rate by 1.5-1.6 times and a decrease in the correlation time determined by the electron paramagnetic resonance method were observed. The IR Fourier method recorded a change in the chemical structure during ozone oxidation. The intensity of the ether bond bands changed, and new bands appeared at 1640 and 1537 cm, which corresponded to the formation of -C=C- bonds.
臭氧在聚合物复合材料的氧化过程中是一种强大的破坏剂。臭氧的破坏能力主要取决于其浓度、暴露持续时间、聚合物类型及其基体结构。在这项工作中，制备了天然橡胶含量分别为5%、10%和15%（重量）的聚乳酸/天然橡胶（PLA/NR）非织造纤维，然后对其进行800分钟的臭氧氧化处理。使用各种物理化学分析方法评估了臭氧处理的效果。视觉效果表现为PLA/NR纤维颜色的变化。差示扫描量热法显示热物理特性发生了变化。聚乳酸的玻璃化转变温度和冷结晶温度向较低温度移动，结晶度增加。研究发现，在PLA/NR纤维样品中，降解过程比交联过程占主导地位，因为观察到熔体流动速率增加了1.5 - 1.6倍，并且通过电子顺磁共振方法测定的相关时间缩短。红外傅里叶方法记录了臭氧氧化过程中化学结构的变化。醚键带的强度发生了变化，并且在1640和1537 cm处出现了新的谱带，这对应于-C=C-键的形成。
