Several segmented polyurethanes have been synthesized, based on a variety of hydroxyl-terminated polybutadienes (HTPB) , two of which included a free radically polymerized, branched polybutadiene with an average functionality of 2.1, and a hydrogenated derivative. The third was an anionically polymerized, high vinyl content polybutadiene with an average functionality of 1.9. Polyurethanes were prepared in bulk, without added catalyst, by a two-step process, where first the HTPB was endcapped with an excess of 2,4-toluenediisocyanate followed by chain extension by 1 , 4-butanediol . Series of samples of varying hard segment (urethane) content were prepared by this method.
| Identifer | oai:union.ndltd.org:UMASS/oai:scholarworks.umass.edu:theses-3059 |
| Date | 01 January 1981 |
| Creators | Rossman, Mark B. |
| Publisher | ScholarWorks@UMass Amherst |
| Source Sets | University of Massachusetts, Amherst |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | Masters Theses 1911 - February 2014 |
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