Effect of HTPB structure on prepolymer characteristics and on mechanical properties of polybutadiene-based polyurethanes |
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| Authors: | Walter Vilar Leni Akcelrud |
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| Affiliation: | (1) Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil;(2) Escola de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil;(3) Present address: Polymer Science and Engineering, University of Massachusetts, 01003 Amherst, MA, USA |
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| Abstract: | Oligobutadiene-based prepolymers and polyurethanes (PU) were prepared from hydroxyl terminated polybutadiene (HTPB), three diisocyanates (aromatic, alicyclic and aliphatic) and two chain extenders (containing hydroxyl or amino groups). The free NCO content in the prepolymers varied systematically and the characteristic of these products were interpreted in terms of NCO group reactivity, propagation reactions and HTPB functionality. The mechanical properties of the polyurethane elastomers derived from the prepolymers were discussed in terms of hard and soft segment structures. |
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