Soy-Based UV Resistant Polyurethane Pultruded Composites: Phase II

Development of affordable soy-based aromatic and aliphatic PU composites with improved mechanical and environmental performance is the focus of the proposed study. In our previous study, we have successfully manufactured both aromatic and aliphatic PU composites with 20% soy content. Neat resin samples of base PU and soy-PU were manufactured to evaluate the performance of the resin system. As the polyol and the isocyanate components of the PU resin system are susceptible to moisture, a novel mixing process was developed to make void free neat resin samples. A new metering unit system and an injection box were integrated with the pultrusion machine to manufacture PU composites. The mechanical performance of the neat resin samples and pultruded composites was evaluated. The performance of the soy-based resin is comparable to the base PU resin. However, aromatic PU based composites have poor environmental stability under UV light exposure and require specialized painting to provide protection. Aliphatic PU resins provide improved UV resistance but exhibit lower mechanical performance in comparison to aromatic polyurethanes. We have conducted preliminary studies on feasibility of incorporating nano-engineered fillers in the aliphatic PU resin system to compensate for the reduction in mechanical properties. In the proposed research, the current on-going work will be expanded to manufacture aromatic and aliphatic PU composites with increased soy content. Also, the initial study conducted for incorporating nano-engineered fillers in the aliphatic PU resin system will be used to manufacture PU nanocomposites. Fillers such as titanium dioxide will be mixed with the resin to obtain desired color for the finished part. The cure kinetics of the PU systems will be studied by differential scanning calorimetry (DSC) and the reaction rates of the aliphatic and aromatic polyurethanes will be compared. Mechanical and environmental performance will be evaluated by conducting tensile, flexure, impact, salt fog and UV exposure tests. The economics of aromatic and aliphatic systems will be assessed.


  • English


  • Status: Completed
  • Funding: $75000.00
  • Contract Numbers:



  • Sponsor Organizations:

    United Soybean Board

    16305 Swingley Ridge Road, Suite 150
    Chesterfield, MO  United States  63017
  • Principal Investigators:

    Chandrashekhara, K

  • Start Date: 20100901
  • Expected Completion Date: 0
  • Actual Completion Date: 20110831
  • Source Data: RiP Project 27254

Subject/Index Terms

Filing Info

  • Accession Number: 01466142
  • Record Type: Research project
  • Source Agency: Center for Infrastructure Engineering Studies
  • Contract Numbers: DTRT, 00032551
  • Files: UTC, RIP
  • Created Date: Jan 3 2013 3:11PM