Physical and mechanical properties of poplar wood synergistically modified with water-soluble acrylic-based monomer and glutaraldehyde
Fast-growing wood possesses the distinct advantages of rapid growth and environmental adaptability.However,they face challenges such as imperfect quality and poor dimensional stability.In this study,poplar(Populus ussuriensis)wood was treated with 20％water-soluble 2-hydroxyethyl methacrylate(HEMA)or N-hydroxymethacrylamide(NMA)by adding a certain mass ratio(2％,4％,or 6％)of glutaraldehyde(GA)as cross-link agent.The obtained solutions were named as HG and NG,respectively.The permeability and distribution of incorporated chemicals in poplar wood was assessed according to the density,mass percentage gain(WPG),and bulking coefficient(BC).The dimensional stability and leachability were measured by cycling of water-soaking and drying.The results indicated that the increase in GA mass ratio resulted in treated wood with higher density,WPG,BC,and anti-shrink efficiency(ASE),as well as reduced leachability of chemicals.The effects of the treatment on physical and mechanical properties of the wood were investigated by the bending and impact tests.The results showed that ASE of the treated wood can reach up to 49.6％for HG group at 23.6％WPG and 54.2％for NG group at 38.6％WPG when the cross-link agent of GA mass ratio was 6％.In particular,GA had an excellent cross-linking function,so that the poplar treated with HEMA monomers with 6％GA showed a threefold WPG and a fourfold ASE compared to that without GA.The bending test results showed that the modulus of rupture(MOR)and modulus of elasticity(MOE)of the wood in all HG and NG groups were improved compared to the untreated wood.Both the HG and NG groups with 6％GA had the highest increase in each group,MOR of HG6 group samples increased from(81.3±7.2)MPa(untreated)to(133.4±9.3)MPa,and MOR of NG6 group samples increased to(140.0±10.0)MPa.Meanwhile,MOE of HG6 and NG6 increased by 160.3％and 170.6％,respec-tively.When comparing HG6 with NG6,it can be seen that both MOR and MOE of NG6 were enhanced,which can be attributed to the fact that NG6 had a higher WPG.Significantly,both HG and NG treatments had an ignorable effect on the toughness,in which,the toughness of the HG groups were reduced slightly and the NG groups maintained the tough-ness values.The above results demonstrated that treatments with HG and NG can significantly improve the quality of fast-growing poplar wood,so that it may be used in a broader area.
万方数据
维普
