Thật vinh dự

Thật vinh dự

Kết quả (Anh) 1:

That is a pleasure

Kết quả (Anh) 2:

It's an honor.

Kết quả (Anh) 3:

In this study, a chemical bond was formed between the WPCsurface and poplar wood by the "molecule bridge" provided bysilane as coupling agent. After treatment with trimethoxy vinylsilane (A171) and r-aminopropyl triethoxy silane (KH550) as coupling agents, the surface contact angle of poplar wood increasedremarkably, and a graph analyzed by using ATR-FTIR indicated thatthe molecule chain belonged to A171 and KH550 grafted onto thesurface of the wood.The bonding strength between WF/HDPE and wood veneerdecreased with increasing wood fiber content in WF/HDPE. Whenthe wood fiber content increased to 80 part, the HDPE on the surface of the WPC was much smaller in volume than in samples withlow wood fiber content, and thus its bonding strength was the lowest. Because of the chemical characteristics of the terminal group(NH2A) of KH550, HDPE macromolecular radicals used the hydrogen atom and converted back into hydrocarbons, thus losing reactivity (Fig. 8 reaction 5). This is the why the bonding strength ofsamples treated by KH550 were lower than those treated byA171. SEM images show that under the combined action ofthe silane coupling agent A171 and DCP, the interface of the woodpoplar veneer and the WF/HDPE were firm and without cracks. Butthere were tiny gaps in the interface of samples treated withKH550. Both types of silane coupling agents had good water resistance, except for samples with 80 part wood fibers in the basematerial.In conclusion, the silane coupling agent A171 is more suitablefor bonding wood poplar veneer and WPC base material thanKH550. The relatively low wood fiber content of WPC can supply sufficient HDPE to react with the coupling agent sequentially andyield higher surface bonding strength. Even without using a thermoset adhesive, it is