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Abstract:
Segmented poly(ether-b-urethanes) have been synthesized with 2000 MW polypropylene oxide coupled with diisocyanates and diol type chain extenders. The diisocyanates used were symmetric rigid 4,4'-diphenylmethane diisocyanate (MDI), linear aliphatic hexamethylene diisocyanate (HDI) and unsymmetric rigid toluene-2,4-diisocyanate (TDI). The chain extenders were symmetric N,N'-bis(2- hydroxyethyl) terephthalamide (BT) and N,N'-bis(2-hydroxyethyl)-hydroquinone (BH) unsymmetric N,N'-bis(2-hydroxyethyl)isophthalamide, and linear aliphatic butanediol. Hard segment contents ranged from 20 to 40 wt %. The thermal behavior of these materials is consistent with phase separation into separate hard and soft domains.
| Description: |
Technical rept. |
| Pages: |
35 |
| Report Date: |
26 OCT 1984 |
| Contract Number: |
N00014-83-K-0083 |
| Report Number: |
A340841 |
Report Unavailable |
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