Hydroxyl-terminated polybutadiene

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What Wikipedia says

Hydroxyl-terminated polybutadiene (HTPB) is an oligomer of butadiene terminated at each end with a hydroxyl functional group. It reacts with isocyanates to form polyurethane polymers.

Excerpt from the Wikipedia article “Hydroxyl-terminated polybutadiene”, under the CC BY-SA 4.0 license. Read the article on Wikipedia