关键词:
Tensile strength
摘要:
A series of composite materials x% CGy-PU [where x% is modified coffee grounds (referred to as modified CG) content (based on the mass of PU, the same below) and y is modified CG mesh number, the same below] were prepared by two-step method with modified CG and polyurethane (PU) as filler and matrix, respectively, and characterized by FTIR, SEM and EDS for analyses on the structure, microstructure and element distribution. The effects of modified CG content and mesh number on the damping, thermal stability and mechanical properties of composites were assessed by dynamic viscoelastic spectrometer (DMA), TGA and universal mechanical testing machine. The results showed that the 10% CG150-PU with 10% modified CG (150 mesh) exhibited the best damping effect and effectively improved thermal stability, with the loss factor as high as 0.66, and the tensile strength and elongation at break increased by 34.0% and 12.9%, respectively, compared with those of PU. The modified CG mesh number could greatly affect the damping peak temperature range of composites. © 2025 Fine Chemicals. All rights reserved.