Structural characteristics and properties of PU-modified TDE-85/MeTHPA epoxy resin
Tóm tắt
Diglycidyl-4,5-epoxycyclohexane-1,2-dicarboxylate (TDE-85)/methyl tetrahydro-phthalic anhydride (MeTHPA) epoxy resin was modified by polyurethane(PU), and its structural characteristics and properties were studied by infrared spectrum analysis (IR), scanning electronic microscopy (SEM), mechanics testing and thermogravimetric analysis (TG). The results indicate that epoxy polymeric network I and polyurethane polymeric network II are formed in the PU-modified TDE-85/MeTHPA epoxy resin. Meanwhile the PU-modified TDE-85/MeTHPA resins have heterogeneous structure. The miscibility between epoxy (EP) and polyurethane (PU) as well as the phase size are dominantly determined by the mass fraction of polyurethane prepolymer (PUP) in the EP/PU blends. With the increase of PUP mass fraction, the tensile strength, impact strength and thermal stability of the PU-modified TDE-85/MeTHPA epoxy resin all firstly exhibit increasing tendency, and decrease after successively reaching their maxima. When the number-average molecular mass of PPG is 1 000 and the mass fraction of PUP is 15%, the tensile strength, impact strength and thermal stability of materials obtained, compared with TDE-85/MeTHPA epoxy resin, are improved obviously.
Tài liệu tham khảo
LI Gui-lin. Epoxy Resin and Epoxy Coatings[M]. Beijing: Chemical Industry Press, 2003. (in Chinese)
ZHANG Chun-hua, HAN Bing, HUANG Yu-dong. Study on properties of TDE-85/aromatic diamine matrix and carbon fiber composites[J]. Journal of Harbin University Science and Technology, 2000, 5(5): 60–63. (in Chinese)
HE Shang-jin, SHI Ke-yu, BAI Jie, et al. Studies on the properties of epoxy resins modified with chain-extended ureas[J]. Polymer, 2001, 42(23): 9641–9647.
CHEN C H, CHEN M H. Synthesis, thermal properties, and morphology of blocked polyurethane/epoxy full-interpenetrating polymer network[J]. Journal of Applied Polymer Science, 2006, 100(1): 323–328.
XIE Hong-quan, GUO Jun-shi. Room temperature synthesis and mechanical properties of two kinds of elastomeric interpenetrating polymer networks based on castor oil[J]. European Polymer Journal, 2002, 38(11): 2271–2277.
KRISHNAN S M. Studies on corrosion resistant properties of sacrificial primed IPN coating systems in comparison with epoxy-PU systems[J]. Progress in Organic Coatings, 2006, 57(4): 383–391.
HU Qiao-ling, FANG Zheng-ping. On the synergism of interpenetrating polymer networks of PU/EP[J]. Journal of Zhejiang University: Sciences Edition, 2001, 28(2): 179–184. (in Chinese)
BHUNIYA S, ADHIKARI B. Toughening of epoxy resins by hydroxy-terminated, silicon-modified polyurethane oligomers[J]. Journal of Applied Polymer Science, 2003, 90(6): 1497–1506.
CHEN C H, SUN Y Y. Mechanical properties of blocked polyurethane/epoxy interpenetrating polymer networks[J]. Journal of Applied Polymer Science, 2006, 101(3): 1826–1832.
LI Jin-bo. High performance epoxy resin nanocomposites containing both organic montmorillonite and castor oil-polyurethane[J]. Polymer Bulletin, 2006, 56(4/5): 377–384.
MA Xiao-yan, YUAN Li, JIA Qiao-ying, et al. Composites of epoxy resin and BMIPBA reinforced with aluminum borate whiskers[J]. Journal of Materials Science & Engineering, 2003, 21(6): 789–792. (in Chinese)
JIANG Li-xiang, SHENG Lei, CHEN Ping, et al. Study on effect of proton irradiation on epoxy resin 648 and TDE-85[J]. Spacecraft Environment Engineering, 2006, 23(3): 134–137. (in Chinese)
JI Ke-jian, LIU Yuan-jun, ZHANG Yin-sheng, et al. NMR characterization of epoxy resin[J]. Acta Material Composite Sinica, 2000, 17(1): 15–18. (in Chinese)
LI Zhi-hua, REN Dong-yan, CHOU Ji-neng, et al. Preparation and FT-IR analysis of the epoxy modified by polyurethane[J]. Thermosetting Resin, 2006, 21(1): 8–11. (in Chinese)
WEN Qing-zhen, ZHU Jin-hua, WANG Yuan-sheng. The influence of chain extenders on the reaction rate of polyether-urethane prepolymers[J]. Journal of Naval University of Engineering, 2003, 15(1): 23–26. (in Chinese)