Research in Progress (RIP) https://rip.trb.org/ en-us Copyright © 2024. National Academy of Sciences. All rights reserved. http://blogs.law.harvard.edu/tech/rss tris-trb@nas.edu (Bill McLeod) tris-trb@nas.edu (Bill McLeod) Research in Progress (RIP) https://rip.trb.org/Images/PageHeader-wTitle-RIP.jpg https://rip.trb.org/ SPR-4834: Riprap and Aggregate Polyurethane Stabilization for Drainage, Erosion Control and Road https://rip.trb.org/View/2238730 Thu, 31 Aug 2023 16:34:53 GMT https://rip.trb.org/View/2238730 Applications of Elastomeric Polymers for Accelerated Bridge Construction and Retrofit https://rip.trb.org/View/1692558 Tue, 10 Mar 2020 15:15:15 GMT https://rip.trb.org/View/1692558 Nano-Engineered Polyurethane Resin - Modified Concrete https://rip.trb.org/View/1318018 Fri, 01 Aug 2014 01:15:16 GMT https://rip.trb.org/View/1318018 Soy-Based UV Resistant Polyurethane Pultruded Composites: Phase II https://rip.trb.org/View/1234377 Thu, 03 Jan 2013 15:11:24 GMT https://rip.trb.org/View/1234377 Acquisition of Equipments for Composite Manufacturing Laboratory https://rip.trb.org/View/1230440 Thu, 03 Jan 2013 14:00:23 GMT https://rip.trb.org/View/1230440 Soy-based UV Resistant Polyurethane Pultruded Composites https://rip.trb.org/View/1230202 Polyurethane (PU) resin systems exhibit superior strength and damage tolerance relative to unsaturated polyester and vinylester pultrusion resins. Also, high pultrusion line speeds can be achieved using PU resins. A previous study, has successfully evaluated pultrudable PU with aromatic isocyanate and soy-based polyol (with 20% soy content). 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. In the proposed work, we will investigate pultrudable PU resin systems with aromatic and aliphatic isocyanates, and soy-polyol. Neat resin coupons and pultruded composite parts will be manufactured using the developed aromatic and aliphatic PU resin systems. Also, parts will be manufactured by incorporating nano-engineered fillers in the aliphatic soy-based PU resin system to compensate the loss of mechanical performance over aromatic PU resins. The cure kinetics of polyurethanes will be studied by differential scanning calorimetry (DSC) and the reaction rates of the aliphatic and aromatic polyurethanes will be compared. Mechanical performance will be evaluated by conducting tensile, flexure and impact tests. The economics of aromatic system and aliphatic systems will be assessed.

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Thu, 03 Jan 2013 13:55:58 GMT https://rip.trb.org/View/1230202
Pultruded Composites Using Soy-Based Polyurethane https://rip.trb.org/View/1228336 Thu, 03 Jan 2013 13:19:06 GMT https://rip.trb.org/View/1228336