▎ 摘　　要

In this study, the effects of a coupling agent and additive on the physicomechanical (morphological, mechanical, thermal, and swelling) properties of tea dust (TD)-polypropylene (PP) composites were studied. TD-PP composites were prepared with untreated tea dust (UTD) and tetraethylsilane (TES)-treated TD or silanated tea dust (STD) particles at ratios of 0: 100, 10: 90, 20: 80, 30:70, and 40:60 w/w. Initially, TD particles were grafted by TES as a coupling agent, and these STD particles were then modified with graphene oxide (GO) as an additive to study their effects on the STD-PP composites; these were compared to the STD-PP and UTD-PP composites in accordance with a study of improvements in the mechanical properties. All of the TD-PP composites were analyzed with Fourier transform infrared spectroscopy, scanning electron microscopy, and mechanical, thermal, and physical tests. The thermal and mechanical properties of both the STD-PP and GO-modified STD-PP composites were found to be improved as compared to those of the UTD-PP composites. So, the recycling of a large amount of TD as a waste material could be useful in the preparation of TD-PP composites. (C) 2015 Wiley Periodicals, Inc.