Abstract: Poly（hydroxyalkanoate） （PHA）/tea plant fiber （TPF） composites were prepared by using glycidyl methacrylate （GMA）-modified TPF and PHA as raw materials through solution casting， and their mechanical properties， chemical structure， thermal stability， and microscopic morphology were characterized using an intelligent tensile testing machine， Fourier-transformation infrared spectrometer， thermogravimetric analyzer， and scanning electron microscope. The effects of TPF and GMA contents on the properties of the composites and their action mechanisms were investigated. The results indicated that the composites exhibited an increase at first and then a decrease in tensile strength and elongation at break with an increase in the TPF content. The composites obtained optimal performance at a TPF content of 15 wt%， resulting in an increase in tensile strength by 28.87 % and in elongation at break by 52.31 % compared to pure PHA. The compatibility between the GMA-modified TPF and PHA was improved， leading to an enhancement in the mechanical properties and thermal stability of the composites. The composites showed an increase at first and then a decrease in tensile strength and elongation at break with an increase in the GMA content. The composites obtained optimal performance at a GMA content of 3 wt%， resulting in an increase in tensile strength by 66.03 % and elongation at break by 45.01 % compared to the counterpart without GMA.

Key words: polyhydroxyalkanoate, tea plant fiber, glycidyl methacrylate, composite