Wood-plastic composites are green composites made of plastic as the matrix and wood as the filler; however, the incompatibility between these two leads to the degradation of the composites. This paper reports the synthesis of a novel bio-based compatibilizer, annotated as OA-g-H20, by grafting oleic acid (OA) on a hyperbranched polyester (Boltorn H20). The effect of modifying recycled polypropylene-based wood–plastic composites with this compatibilizer was then assessed. The Fourier transform infrared spectroscopy, thermogravimetric analysis, and gel permeation chromatography techniques were employed to characterize the fabricated OA-g-H20, while its modification effect was assessed by differential scanning calorimetry, dynamic thermomechanical analysis, scanning electron microscopy, and mechanical property tests. The experimental results revealed that the optimal addition amount of OA-g-H20 was 2.0 wt.%.

中文翻译：

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生物基增容剂增强再生聚丙烯木塑复合材料的制备及性能

木塑复合材料是以塑料为基体、木材为填料制成的绿色复合材料；然而，这两者之间的不相容性导致复合材料的降解。本文报道了通过将油酸（OA）接枝到超支化聚酯（Boltorn H20）上合成了一种新型生物基增容剂，注释为 OA-g-H20。然后评估了用这种增容剂改性再生聚丙烯基木塑复合材料的效果。采用傅里叶变换红外光谱、热重分析和凝胶渗透色谱技术对制备的OA-g-H20进行表征，并通过差示扫描量热法、动态热机械分析、扫描电子显微镜和力学性能测试评估其改性效果。实验结果表明，OA-g-H20的最佳添加量为2.0 wt.%。