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Structure Property Relationship of Aliphatic Polyurethane Elastomers Prepared from CHDI
| Content Provider | Semantic Scholar |
|---|---|
| Author | Byrne, Catherine A. Desper, C. H. Mead, Joey L. |
| Copyright Year | 1991 |
| Abstract | Abstract : Aliphatic polyurethane elastomers have been prepared from trans-1,4- diisocyanatocyclohexane, poly(tetramethylene oxide), 1,4-butanediol and optionally trimethylolpropane. CHDI is a compact symmetrical diisocyanate which is responsible for remarkable properties in these polymers. They are nearly transparent elastomers with low glass transition temperatures of approximately - 80 C, and high final softening temperatures up to 270 C, for polymers with low hard phase contents of 20% to 30%. They are well phase separated and exhibit either paracrystallinity or crystallinity with small crystallite size after preparation. Considerable crystallinity develops after scanning up in temperature to 275 C or holding at 150 C to 160 C for six hours. The polymers are insoluble even when heated in polymer solvents and this is attributed to ordering even in the as-synthesized polymers. They have excellent mechanical properties compared to other polyurethane elastomers and retain their modulus up to high temperatures. Because of their excellent phase separation and low hard segment content, with the resultant discrete domains, they exhibit very low hysteresis in compression and tension. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://apps.dtic.mil/dtic/tr/fulltext/u2/a239397.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
