糠醇/丙烯酰胺复合改性杨木的制备与性能研究OA北大核心

In order to add value to the fast-grown wood species,Populus ussuriensis was selected as the raw material in this study.Different mass fractions of furfuryl alcohol(FA)oligomer solutions and varying ratios of furfuryl alcohol/acrylamide(AM)modifiers were applied to treat the wood.The distribution of the modifiers and their effects on the physical and mechanical properties of the modified wood were analyzed.The results showed that when the mass fraction of FA was 30%and the molecular weight of oligomers was less than 1 000,the modify solution entered the cell wall.The dimensional stability of furfuryl alcohol modified materials improves with the increase of FA mass fraction.After adding acrylamide,the weight gain rate and density of the FA/AM treated samples increased as the increase of AM addition.The anti-swelling coefficient reached 37.51%.When the ratio of FA to AM substances was 4∶1,the flexural strength of the modified material was 83.54 MPa,the flexural modulus was 14.83 GPa,and the impact strength was 28.64 kJ/m².The impact strength was 44.43%higher than that of the modified material with furfuryl alcohol alone(mass fraction of 30%).The acrylamide affects the self-crosslinking reaction of furfuryl alcohol,reduces the density of the network structure of furfuryl alcohol resin,and improves the impact strength of FA/AM modified materials.