Two Modified Treatment Methods for Pretreated Corn Stalk and Its Composites with Modified Lignosulfonate
Sidan Li,
Yuejing Bin,
Shan Zhong,
Weidong Wang,
Gongbing Sun,
Yongmou Zeng,
Siji Chen,
Zirong Li,
Yuan Yuan
Affiliations
Sidan Li
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Yuejing Bin
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Shan Zhong
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Weidong Wang
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Gongbing Sun
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Yongmou Zeng
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Siji Chen
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Zirong Li
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Yuan Yuan
College of Mechanical and Resource Engineering, Wuzhou University, Wuzhou 543000, China; Wuzhou Engineering Research Center of Resource Recycling, Wuzhou 543000, China
Effects of two different modified treatments were investigated relative to the chemical and mechanical properties of pretreated corn stalk particles and their composites prepared with a modified lignosulfonate (ML) binder. Corn stalk particles (CP) first were prepared by treating corn stalk particles with oxalic acid in ultrasonic conditions (pretreated corn stalk particles, PCP). These particles were then modified by treatment with either laccase-vanillin system with ultrasound (LU) or polyethylenimine-glutaraldehyde with ultrasound (PU), and the surface chemistries of the modified PCP and mechanical properties of LU-PCP/ML composites and PU-PCP/ML composites, such as modulus of rupture (MOR), modulus of elasticity (MOE), internal bonding strength (IB), 24-h thickness swelling (TS), and crystallinity were compared. Both modified treatments dramatically enhanced the mechanical properties of the composites. The MOR, MOE, and IB of the PU-PCP/ML composites were improved by up to 148%, 81%, and 62%, respectively, compared to LU-PCP/ML. Moreover, the 24-h TS of the LU-PCP/ML composites was reduced by 16%. These results show that the pretreatment method of CP and ultrasonic collaborative treatment of PCP can effectively improve the properties of its composites. Modified PCP with PU was more favorable for surface chemical and mechanical properties.
