- Author
-
Cooper, S. L.
|
Tobolsky, A. V.
- Title
- Properties of Linear Elastomeric Polyurethanes.
- Coporate
- Princeton Univ., NJ
- Sponsor
- Office of Naval Research, Washington, DC
- Report
-
RLT-927
May 1966
17 p.
- Distribution
- Available from National Technical Information Service
- Contract
- NONR-1858-07
- Keywords
-
elastomers
|
plasticizers
|
spandex (trademark)
|
copolymers
- Identifiers
- reinforced polymers
- Abstract
- The viscoelastic properties of some polyester-urethanes are compared with the properties of other polymers. The behavior observed is anomalous in that these polyurethanes exhibit an unusually high value of modulus well above their Tg, unaccounted for by either crosslinking or crystallinity. Various experiments including incorporation of plasticizers of widely varying chemical composition have suggested interpretation of the system as a block copolymer, each block having its ownTg. Each of the two types of blocks seems to associate with similar blocks from other molecules.