Cabello-Alvarado Christian J, Quiñones-Jurado Zoe V, Cruz-Delgado Víctor J, Avila-Orta Carlos A
Consejo Nacional de Ciencia y Tecnologia, Centro de Investigación y de Innovación del Estado de Tlaxcala, Tlaxcala C.P. 90000, Mexico.
Departamento de Materiales Avanzados, Centro de Investigación en Química Aplicada, Saltillo, Coahuila C.P. 25294, Mexico.
Materials (Basel). 2020 Sep 1;13(17):3855. doi: 10.3390/ma13173855.
Ultrasound-assisted melt-extrusion method (USME) is a high-quality process used to produce polymeric compounds with an adequate homogeneous dispersion. This study evaluates white-color films of linear low-density polyethylene (LLDPE) prepared using TiO masterbatch obtained by ultrasound-assisted melt-extrusion at variable frequencies (USME-VF). LLDPE with three different melt-flow indices (2, 20 and 50 g/10 min) were used as the polymer matrix. The films were obtained from the dilution of masterbatches of LLDPE (melt-flow index = 2) at a concentration of 7 wt% TiO. The morphology, pigmentation, TiO reactivity, and the mechanical stability of the films were assessed. The masterbatch compounds were evaluated by melt-flow index (MFI) and scanning electron microscopy (SEM). The contrast ratio, yellowness index and mechanical properties of films were also measured. The properties of whiteness and elongation at break improved in the films prepared using masterbatches with higher dispersion. Though the reactivity of the TiO particles increased during accelerated aging, it did not affect the elongation to rupture. The yellowness index was moderately affected in films that included TiO particles processed using USME-VF.
超声辅助熔融挤出法（USME）是一种用于生产具有充分均匀分散性的聚合物化合物的高质量工艺。本研究评估了使用通过可变频率超声辅助熔融挤出（USME-VF）获得的TiO母粒制备的线性低密度聚乙烯（LLDPE）白色薄膜。使用具有三种不同熔体流动指数（2、20和50 g/10 min）的LLDPE作为聚合物基体。这些薄膜是通过将LLDPE母粒（熔体流动指数 = 2）以7 wt% TiO的浓度稀释而获得的。评估了薄膜的形态、色素沉着、TiO反应性和机械稳定性。通过熔体流动指数（MFI）和扫描电子显微镜（SEM）对母粒化合物进行了评估。还测量了薄膜的对比度、黄度指数和机械性能。使用具有更高分散性的母粒制备的薄膜中，白度和断裂伸长率的性能得到了改善。尽管TiO颗粒在加速老化过程中的反应性增加，但它并未影响断裂伸长率。在包含使用USME-VF处理的TiO颗粒的薄膜中，黄度指数受到了适度影响。
