Abstract This work presents the chemical modification of Spanish broom flour (SBF), and the study of SBF loading and surface treatment on the performances of polypropylene (PP) biocomposites. In order to enhance the interfacial interactions between the PP matrix and the SBF, two types of chemical treatments were used: 2 wt% of sodium hydroxide (NaOH) for different times (8, 24 and 48 h) and 5 wt% of vinyltrimethoxysilane (VTMS), respectively. Different techniques for characterization such as the melting flow index (MFI), X-ray diffraction, transient plane source (TPS) and water absorption were used. The experiment results showed a decrease of the MFI with increasing of modified SBF content, independently of the type of the chemical treatment. Moreover, this decrease became significant in the biocomposites containing SBF-VTMS. The X-ray patterns showed that surface treatment of SBF could improve their crystallinity and crystallite sizes. The TPS measurements illustrates that the thermal conductivity of the biocomposites decreases with 10 wt% of modified SBF loading. Higher content than 20 wt% of SBF, improved the thermal conductivity of the biocomposites. Meanwhile, the lowest values were found when the VTMS is used. Besides, it was accompanied by a decrease in absorptivity due to the better interfacial adhesion SBF-PP.

中文翻译：

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化学处理对西班牙扫帚粉增强聚丙烯生物复合材料热物理行为的影响

摘要 这项工作介绍了西班牙扫帚粉 (SBF) 的化学改性，以及 SBF 负载和表面处理对聚丙烯 (PP) 生物复合材料性能的研究。为了增强 PP 基体和 SBF 之间的界面相互作用，使用了两种类型的化学处理：2 wt% 的氢氧化钠 (NaOH) 不同时间（8、24 和 48 小时）和 5 wt% 的乙烯基三甲氧基硅烷（ VTMS），分别。使用了不同的表征技术，例如熔体流动指数 (MFI)、X 射线衍射、瞬态平面源 (TPS) 和吸水率。实验结果显示 MFI 随着改性 SBF 含量的增加而降低，与化学处理的类型无关。此外，这种下降在含有 SBF-VTMS 的生物复合材料中变得显着。X 射线图表明，SBF 的表面处理可以改善其结晶度和微晶尺寸。TPS 测量表明，生物复合材料的热导率随着 10 wt% 的改性 SBF 负载而降低。高于 20 wt% 的 SBF 含量提高了生物复合材料的热导率。同时，在使用 VTMS 时发现了最低值。此外，由于更好的界面粘附 SBF-PP，它伴随着吸收率的降低。使用 VTMS 时发现了最低值。此外，由于更好的界面粘附 SBF-PP，它伴随着吸收率的降低。使用 VTMS 时发现了最低值。此外，由于更好的界面粘附 SBF-PP，它伴随着吸收率的降低。