It looks like you're using Internet Explorer 11 or older. This website works best with modern browsers such as the latest versions of Chrome, Firefox, Safari, and Edge. If you continue with this browser, you may see unexpected results.
Polymer Database (PoLyInfo) "Polymer Database "PoLyInfo" systematically provides various data required for polymeric material design." Free, but registration may be required to view some data.
SciTech Connect "SciTech Connect is your connection to science, technology, and engineering research information from the U.S. Department of Energy..."
Wolfram Alpha Computational Knowledge Engine "Answer questions; do math; instantly get facts, calculators, unit conversions, and real-time quantitative data and statistics; create plots and visualizations; and access vast scientific, technical, chemical, medical, health, business, financial, weather, geographic, dictionary, calendar, reference, and general knowledge and much more." CSULB