I wanted to start a place where we could go to for research or to learn about plastics so here is my first contribution. Dave has done so much in terms of an overview but the field of plastics is large. I think we need all the information we an get.
https://www.britannica.com/science/plastic#ref82466
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found a great site for information the site is called bookboon I found this book on polymer science and best of all its free
https://bookboon.com/en/introduction-to-polymer-science-and-technology-ebook
I have found a dutch site with little clips about the separation of plastic in the Netherlands: https://www.hvcgroep.nl/nieuws/vlog-1-marit-zoekt-het-uit-%E2%80%93-alles-over-plastic. It’s not translated, but I thought it was worth sharing;)