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Citation: ZENG Shao-Min, LIU Dan, CHEN Ai-Fang, YAO Chang, GUO Xiao-Li, XU Zu-Shun. Synthesis and Properties of Hyperbranched Polyurethane Hot Melt Adhesives[J]. Chinese Journal of Applied Chemistry, ;2009, 26(2): 159-162. shu

Synthesis and Properties of Hyperbranched Polyurethane Hot Melt Adhesives

1.
College of Materials Science and Engineering, Hubei University, Wuhan 430062

Corresponding author: XU Zu-Shun,
Received Date: 8 January 2008
Available Online: 26 June 2008
Fund Project: 湖北省杰出人才基金资助项目(2004ABB003) (2004ABB003)

Hyperbranched polyurethane was successfully synthesized by AA'+bB₂ approach and it could be used as hot melt adhesives.Excessive 2,4-toluylene diisocyanate(TDI) was used to react with polycarbona-tediols(PCDL) to obtain isocyanate end-capped oligomeric A₂.Then the bB₂ monomer,diethanolamine(DEOA) was added at 0 ℃ to form the AB₂ intermediate.Further self-condensation of this AB₂ intermediate led to hyperbranched polyurethane(HPU) with long chains between the branching points at a higher temperature.The structure of the product was characterized by FTIR,¹³C NMR and GPC.The results show that the degree of branching(DB) of the polymer was up to 0.75 when the reaction was conducted at 55 ℃ for 20 h,and the weight-average molecular mass(M_W) was 7.0×10³.The thermogravimetric analysis(TGA) and tensile test were also conducted.The degradation temperature of the product was up to 200 ℃.The adhesive shear strength of the product increased with increasing the length of the aliphatic chains,with the highest value of 6.5 MPa.
- hyperbranched polyurethane,
- synthesis,
- hot melt adhesives
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