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bce ›› 2018, Vol. 52 ›› Issue (4): 29-35.doi: 10.3969/j.issn.1673-5854.2018.04.006

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Degradation Performances of Poly(vinylalcohol)/Wheat Straw Alkali Lignin Foaming Material with Formaldehyde Crosslinker

HU Ping1, WANG Lifang1, JIA Boran1, LIU Ying1, SHA Xiaoling1, REN Shixue1,2   

  1. 1. College of Material Science of Technology, Northeast Forestry University, Harbin 150040, China;
    2. Key Laboratory of Bio-based Material Science and Technology of Ministry of Education, Northeast Forestry University, Harbin 150040, China
  • Received:2017-04-10 Online:2018-07-30 Published:2018-08-02

Abstract: The effects of chemical degradation, thermal degradation, biodegradation and ultraviolet light degradation on the mechanical properties and apparent density of poly(vinylalcohol)(PVA)/wheat straw alkali lignin foaming material(PLFM) with formaldehyde as crosslinker were studied. The structural changes of PLFM after degradation were investigated by FT-IR, SEM and TG/DTG. The results showed that the tensile strength decreased from 22.64MPa to 5.65, 9.05, 7.43 and 7.64MPa, and the degradation rates were 75.09%,60.02%,67.18% and 66.25%, respectively, after chemical degradation, thermal degradation(150℃), biodegradation and ultraviolet light degradation, when the mass fraction of alkali lignin in PLFM was 20%. The SEM images showed that the closed pore structures of PLEM were seriously destroyed by chemical degradation and biodegradation and slightly destroyed by ultraviolet light degradation and thermal degradation. After chemical degradation and biodegradation, the apparent density increased from 0.183 7 g/cm3 to 0.216 4 and 0.210 4 g/cm3 and after ultraviolet light degradation and thermal degradation, the apparent density reduced from 0.183 7 g/cm3 to 0.1774 and 0.176 6 g/cm3. In addition, FT-IR and TG/DTG analysis showed that the molecular structure of PLFM was destroyed in different degree by chemical degradation, thermal degradation, biodegradation and ultraviolet light degradation. The structure of PLFM was most seriously destroyed by chemical degradation.

Key words: poly(vinylalcohol), alkali lignin, foaming material, degradation

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