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›› 2013, Vol. 47 ›› Issue (5): 1-6.doi: 10.3969/j.issn.1673-5854.2013.05.001

• 研究报告 •     Next Articles

Effect of Polymerization Degree of PVA on the Mechanical Properties of Alkaline Lignin/Poly (Vinyl Alcohol) Blend Membranes

XU Guan-hao, REN Shi-xue, FANG Gui-zhen   

  1. College of Material Science and Technology, Northeast Forestry University, Harbin 150040, China
  • Received:2013-04-22 Revised:1900-01-01 Online:2013-09-30 Published:2013-09-30

Abstract: With the same addition of alkaline lignin, the blend membranes were fabricated by alkaline lignin and three different polymerization degree of poly (vinyl alcohol) according to the film casting method. The properties of membranes were observed by intelligent electronic universal testing machine, SEM and TG. Also the mechanical properties of the membranes in solvents of different polarities were analyzed. The results showed that alkaline lignin dispersed well in PVA domain and the addition of alkaline lignin improved the mechanical properties of PVA membranes. When the mass fraction of alkaline was 15% and polymerization degree changed from PVA0588 to PVA2488, the tensile strength of blend membranes increased from 35.16 MPa to 48.30 MPa. Which improved 37.37%, and the elongation at break of blend membranes increased from 172.22% to 247.08%, which improved 43.47%. The solvent resistance and thermal stability of the membranes went up with the increase of polymerization degree of poly (vinyl alcohol) and the addition of alkaline lignin.

Key words: polymerization degree, mechanical property, alkaline lignin, PVA, blend membrane

CLC Number: