林产化学与工业Issue(2)：55-61,7.DOI:10.3969/j.issn.0253-2417.2015.02.008
聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究
Plastics Performance of Cellulose Based Urea-formaldehyde Resins Modified by Poly (MMA-BA-MAA) Copolymer
摘要
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.关键词
聚丙烯酸酯/纤维素基脲醛树脂/模塑料/增韧改性/力学性能/热稳定性Key words
polyacrylate/cellulose based urea-formaldehyde resin/molding compound/toughening modification/mechanical properties/thermal stability分类
化学化工引用本文复制引用
刘娟,南静娅,王春鹏,刘玉鹏,陈日清..聚丙烯酸酯改性纤维素基脲醛树脂模塑料性能研究[J].林产化学与工业,2015,(2):55-61,7.基金项目
中国林科院林业新技术所基本科研业务费专项资金(CAFINT2010K04) （CAFINT2010K04）
