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Chemistry and Industry of Forest Products ›› 2015, Vol. 35 ›› Issue (2): 55-61.doi: 10.3969/j.issn.0253-2417.2015.02.008

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Plastics Performance of Cellulose Based Urea-formaldehyde Resins Modified by Poly (MMA-BA-MAA) Copolymer

LIU Juan1, NAN Jing-ya1, WANG Chun-peng1,2, LIU Yu-peng1, CHEN Ri-qing1,2   

  1. 1. Institute of Chemical Industry of Forest Products, CAF;National Engineering Lab.for Biomass Chemical Utilization; Key and Open Lab.of Forest Chemical Engineering, SFA;Key Lab.of Biomass Energy and Material, Jiangsu Province, Nanjing 210042, China;
    2. Research Institute of Forestry New Technology, CAF, Beijing 100091, China
  • Received:2014-09-04 Online:2015-04-25 Published:2015-04-24

Abstract: Polyacrylate emulsion copolymer (PMBM) was prepared by seeded emulsion polymerization with methyl methacrylate (MMA),n-butyl acrylate (BA) and methyl acrylic acid (MAA) as monomers, which was used as toughening modifier for cellulose based urea-formaldehyde (UF) resin molding compound. The effects of PMBM’s glass transition temperature and contents on the mechanical properties, thermal stability and molding shrinkage rate of the compound were investigated. Moreover, the dynamic mechanical properties and microstructure of fracture surface were studied with dynamic mechanical analysis (DMA) and scanning electron microscope (SEM). The results showed that the toughening effect of PMBM (S3) with Tg of 40 ℃ was the most significant. The toughness of the modified system with 20 % PMBM was the best, and the shrinkage rate was 0.23%. And the impact strength and bending strength were 2.47 kJ/m2 and 75.16 MPa, which were increased by 44.4% and 39.0% compared with those of the unmodified system, respectively. Thermal weight loss rate of molding plastic could be reduced by adding PMBM, so the thermal stability was improved. The DMA test results showed that S3 had the remarkable toughening effects on the molding compound, and its compatibility with urea-formaldehyde resin was better. In addition, fracture surface of molding compound modified with 20% S3 appeared as ductile fracture.

Key words: polyacrylate, cellulose based urea-formaldehyde resin, molding compound, toughening modification, mechanical properties, thermal stability

CLC Number: