Effect of kaolin waste annealing on the structural and thermal behavior of poly(ε−caprolactone)

IF 0.9 Q4 PHYSICS, APPLIED
E. A. S. Filho, C. Luna, A. L. Silva, E. S. B. Ferreira, E. Araújo, A. C. F. Costa
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引用次数: 7

Abstract

The heat treatment effect on kaolin waste from mining was evaluated on the structural and thermal behavior of poly(ε-caprolactone) (PCL). The PCL/KW (kaolin waste) and PCL/HTKW (heat-treated kaolin waste) composites were processed in an internal mixer and subsequently characterized by X-ray diffraction (XRD) and differential scanning calorimetry (DSC). The kaolin waste showed kaolinite and quartz in its composition, while the heat treatment at 1200°C modified it to mullite, quartz and silica-rich amorphous phase. By XRD, there was an increase in the intensity of the peak 2θ = 23.9° of the PCL/KW composites compared to neat PCL. In contrast, PCL/HTKW composites tended to reduce the intensity of the peak 2θ = 23.9°, especially at 5% HTKW. The crystalline melting temperature and the degree of crystallinity of PCL/KW and PCL/HTKW composites were practically unchanged, compared to PCL. However, the crystallization process was more effective with the kaolin waste (KW) without heat treatment, indicating that the HTKW amorphous phase inhibited crystallization. The PCL/KW development promoted an increase in crystallization temperature, relative crystallinity, and crystallization rate, surpassing PCL and the PCL/HTKW system. In view of this, kaolin waste has the potential to accelerate the PCL crystallization process, contributing to add value to a material that would otherwise be discarded and minimizing environmental impacts.
高岭土废料退火对聚ε-己内酯结构和热行为的影响
通过聚ε-己内酯(PCL)的结构和热行为评价了热处理高岭土的效果。在密炼机中处理PCL/KW(高岭土废料)和PCL/HTKW(热处理高岭土废料)复合材料,随后通过X射线衍射(XRD)和差示扫描量热法(DSC)进行表征。高岭土废料的成分为高岭石和石英,而在1200°C下的热处理将其改性为富莫来石、石英和二氧化硅的非晶相。通过XRD,与纯PCL相比,PCL/KW复合材料的峰2θ=23.9°的强度增加。相反,PCL/HTKW复合材料倾向于降低峰值2θ=23.9°的强度,尤其是在5%HTKW时。PCL/KW和PCL/HTKW复合材料的结晶熔融温度和结晶度与PCL相比几乎没有变化。然而,未经热处理的高岭土废料(KW)的结晶过程更有效,表明HTKW非晶相抑制了结晶。PCL/KW的发展促进了结晶温度、相对结晶度和结晶速率的提高,超过了PCL和PCL/HTKW系统。有鉴于此,高岭土废料有可能加速PCL结晶过程,为原本会被丢弃的材料增加价值,并将环境影响降至最低。
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来源期刊
MOMENTO-Revista de Fisica
MOMENTO-Revista de Fisica PHYSICS, APPLIED-
CiteScore
1.10
自引率
37.50%
发文量
12
审稿时长
12 weeks
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