Synthesis and Properties of Hyperbranched Polyurethane with a Long Chain Between the Branching Points

Shao-Min Zeng Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, P. R. China; College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Ai-Fang Chen College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Chang Yao College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Dan Liu College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Chang-Feng Yi Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, P. R. China; College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Zu-Shun Xu Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan 430062, P. R. China; College of Materials Science and Engineering, Hubei University, Wuhan 430062, P. R. China

Abstract

Hyperbranched polyurethane (HPU) with a long chain between the branching points was synthesized from isocyanate end-capped polycarbonatediols and diethanolamine via an oligomeric A₂ + CB₂ approach. The effects of the temperature and molar ratio of nPCDL/nNCO on the degree of branching (DB) were studied. The structure of the products was characterized by ¹³C-NMR. The results showed that the polymers had a hyperbranched structure and the DB value was 0.75 when the nPCDL/nTDI was 0.5 at 55°C. The thermal and adhesive properties were investigated by thermogravimetric analysis and tensile test, respectively. The HPUs could be used as hot melt adhesive, and the maximum lap shear strength was up to 6.5 MPa. Moreover, the effects of the length of the chain, reaction temperature and reaction time on the adhesive ability were investigated.

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Synthesis and Properties of Hyperbranched Polyurethane with a Long Chain Between the Branching Points

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