Composite materials based on an ethylene‐acrylic acid (EAA) copolymer and 20 wt% cellulose fibers were compounded by two runs in a twin‐screw extruder. The composite material with cellulose fibers (CF) and a reference of unfilled EAA were injection molded into plaques using three different temperature profiles with end zone temperatures of 170°C, 200°C, and 230°C. The injection molded samples were then characterized in terms of their mechanical properties, thermal properties, appearance (color and gloss), and surface topography. The higher processing temperatures resulted in a clear discoloration of the composites, but there was no deterioration in the mechanical performance. The addition of cellulose typically gave a tensile modulus three times higher than that of the unfilled EAA, but the strength and strain at rupture were reduced when fibers were added. The processing temperature had no significant influence on the mechanical properties of the composites. Gloss measurements revealed negligible differences between the samples molded at the different melt temperatures but the surface smoothness was somewhat higher when the melt temperature was increased. In general, addition of the cellulose to the EAA reduced the gloss level and the surface smoothness. POLYM. ENG. SCI., 60:5–12, 2020. © 2019 Society of Plastics Engineers

中文翻译：

---

纤维素增强复合材料的注塑成型和外观

将基于乙烯-丙烯酸（EAA）共聚物和20 wt％纤维素纤维的复合材料在双螺杆挤出机中分两次进行复合。纤维素纤维复合材料（CF）和未填充的EAA参比样品使用三种不同的温度曲线（端区温度分别为170°C，200°C和230°C）注塑成板。然后根据机械性能，热性能，外观（颜色和光泽）和表面形貌对注塑样品进行表征。较高的加工温度导致复合材料明显变色，但是机械性能没有降低。纤维素的添加通常使拉伸模量比未填充的EAA高三倍，但是当添加纤维时，断裂时的强度和应变降低。加工温度对复合材料的机械性能没有显着影响。光泽度测量表明，在不同的熔体温度下模制的样品之间的差异可以忽略不计，但是当熔体温度升高时，表面光滑度会更高。通常，将纤维素添加到EAA中会降低光泽度和表面光滑度。POLYM。ENG。SCI。，60：5–12，2020.©2019塑料工程师协会