𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Synthesis of hydroxylated segmented polyurethanes

✍ Scribed by W. Marconi; P. Barontini; A. Martinelli; A. Piozzi

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
288 KB
Volume
28
Category
Article
ISSN
0014-3057

No coin nor oath required. For personal study only.

✦ Synopsis

The synthesis of a hydroxylated polyurethane, by reduction with diborane of the corresponding carboxylated polymer, is described. The starting polyurethane, of the segmented type, contains as chain extender dihydroxymethylpropionic acid. Various conditions for hydrogenation of the carboxy group have been investigated, and it was possible to transform quantitatively carboxy into hydroxymethyl groups, without hydrogenolytic reactions affecting the main chain of the polymer. The obtained polymer was characterized by chemical titration, viscometry, i.r., NMR and DSC.

πŸ“œ SIMILAR VOLUMES

Trifluoroacetylation of segmented polyur
Trifluoroacetylation of segmented polyurethanes
✍ Zoran S. PetroviΔ‡; Ljiljana KorugiΔ‡-PerkoviΔ‡ πŸ“‚ Article πŸ“… 1989 πŸ› Elsevier Science 🌐 English βš– 277 KB

Trifluoroacetylation has been successfully applied to polyamides in order to obtain polymers soluble in aprotic solvents; trifluoroacetylation of polyurethanes was reported to be much slower. In this work, the results of a study of the effect of trifluoroacetic anhydride/NH molar ratio, reaction tim

Synthesis and properties of transparent
Synthesis and properties of transparent thermoplastic segmented polyurethanes
✍ Po Hung Chen; Yu Fen Yang; Da-Kong Lee; Ya-Fen Lin; Hsine-Hsyan Wang; Hong-Bing πŸ“‚ Article πŸ“… 2007 πŸ› John Wiley and Sons 🌐 English βš– 185 KB πŸ‘ 2 views

## Abstract Various segmented polyurethanes with a hard segment content of about 50 wt% were prepared from 4,4′‐diphenylmethane diisocyanate (MDI), a poly(tetramethylene adipate) glycol with an __M__~n~ of 2000, and various combinations of aliphatic diols as chain extenders by a one‐shot, hand‐cast

Thermal stability of segmented polyureth
Thermal stability of segmented polyurethanes
✍ J. Ferguson; Z. Petrovic πŸ“‚ Article πŸ“… 1976 πŸ› Elsevier Science 🌐 English βš– 326 KB

The thermal stabilities of two series of segmented polyurethane fibres have been compared with their chemical structure. The polyurethanes were synthesized from trimethylene diamine; 4, 4' diphenylmethane di-isocyanate and two polyether based macrodi-isocyanates. Thermal stability was measured by th

Thermal degradation of segmented polyure
Thermal degradation of segmented polyurethanes
✍ Zoran S. PetroviΔ‡; Zoltan Zavargo; Joseph H. Flyn; William J. Macknight πŸ“‚ Article πŸ“… 1994 πŸ› John Wiley and Sons 🌐 English βš– 561 KB