结晶
材料科学
成核
差示扫描量热法
高密度聚乙烯
结晶度
纳米复合材料
等温过程
聚乙烯
熔点
化学工程
聚合物结晶
阿夫拉米方程
纳米颗粒
复合材料
高分子化学
热力学
纳米技术
物理
工程类
作者
Saeideh Hojatzadeh,Farshad Rahimpour,Esmail Sharifzadeh
摘要
Abstract The isothermal crystallization kinetics of high‐density polyethylene (HDPE) nanocomposites containing 0, 0.5, 0.75, and 2 wt% of pure and surface‐modified silica were evaluated at three crystallization temperatures ( T c ) of 120°C, 121°C, and 122°C using differential scanning calorimetry (DSC) and applying Avrami, Tobin, and Malkin equations. According to Hoffman‐Weeks theory, the values of the equilibrium melting point () of the nanocomposites decreased with increasing nanoparticle content and were higher in the samples containing AMS nanoparticles, owing to the larger crystal. The results of all three models offered the same trend according to which the change in the crystallization temperature influenced the nucleation mechanism and the crystallization rate. It was found that a greater number of spherulites can be formed via increasing T c from 120°C to 122°C which also decreased the crystallization rate of the nanocomposites. At the crystallization temperature of 122°C, the lowest melting temperature was recorded for the samples, attributed to the formation of more crystals with a lower thickness. Moreover, in HDPE/AMS nanocomposites, the crystallization rate was higher than that of HDPE/PSN, ascribed to the positive effect of surface modification on nanoparticles. Highlights Increased polymer/particle compatibility and isothermal crystallization. Evaluating the nucleation and crystallization using different models. The impact of isothermal crystallization temperature on crystallinity. Variation of equilibrium melting point with the nanoparticle content.
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