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Citation: LIU Hong-Zhi, GAN Wen-Jun, SHEN Jing, GE Tao, JIN Yu-Shu, NI Le-Han. Toughening of Epoxy Resins by PDMS-Modified Polyurethane Oligomers[J]. Chinese Journal of Applied Chemistry, ;2006, 23(4): 409-413. shu

Toughening of Epoxy Resins by PDMS-Modified Polyurethane Oligomers

1.
School of Chemical Engineering, Shanghai University of Engineering, Shanghai 201600

Corresponding author: LIU Hong-Zhi,
Received Date: 5 June 2005
Available Online: 18 December 2005
Fund Project: 上海市重点学科项目(P1402) (P1402)上海市教委青年基金(03FQ23)项目 (03FQ23)

Dimethylopropionic acid(DMPa) was used as a chain extender to extend the isocyanate-terminated PDMS-modified polyurethane prepolymer,and isocyanate-terminated PDMS-modified polyurethane oligomers containing carboxyl groups were obtained.Then a novel type of PU/EP IPN was prepared by the reaction of the oligomers with the epoxy resin monomers(E-51),which was cured by 3,3'-dichloro-4,4'-diaminodiphenyl methane(MOCA).The kinetics of the IPN formation and the microphase separation were analyzed by means of FTIR and SEM.The mechnical properties of the IPN with different PU/EP ratios were investigated by DMA.The thermal stability was also studied by TGA.The experimental results showed that when the amount of PU oligomer was 25%(mass fraction),the impact strength and modulus of the resulted material in glassy state were 23.58 kg/m² and 10³ MPa,respectively.Co MPared with that of the control epoxy resin,the impact strength of the resulted material increased by 116.7%,and the modulus increased almost by 100%;while the 5% weight loss temperature remained almost the same,the synergism of IPN occurred,and accordingly the composite material obtained exhibited excellent compositive properties.
- polyurethane oligomer,
- PDMS,
- toughness,
- epoxy,
- IPN
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