The phys. and mech. properties of aliph. polyesters from monomers obtainable from renewable resources, namely, 1,3-propanediol and succinic acid, were improved by their combination with arom. urethane segments capable of establishing strong intermol. hydrogen bonds. Segmented poly(ester-urethanes) were synthesized from dihydroxy-terminated oligo(propylene succinate) chain-extended with MDI. The newly synthesized materials were exhaustively characterized by 1H NMR spectroscopy, size exclusion chromatog., differential scanning calorimetry, dynamic mech. anal., and with respect to their main static mech. properties, an Instron app. was used. The av. repeat no. of the hard segments, evaluated by NMR, ranged from 4 to 9, whereas that of the flexible segments was about 14. The degree of crystallinity, glass-transition temp., m.p., tensile strength, elongation, and Young's modulus were influenced by the ratio between hard and soft segments of the segmented copolymer in a predictable way. The results demonstrated that poly(ester-urethanes) from 1,3-propanediol and succinic acid are promising thermoplastics.
New segmented poly(ester-urethane)s from renewable resources / L. Y., S.L. M., E. Ranucci, A. A. C.. - In: JOURNAL OF POLYMER SCIENCE. PART A, POLYMER CHEMISTRY. - ISSN 0887-624X. - 39:5(2001), pp. 630-639. [10.1002/1099-0518(20010301)39:5<630::AID-POLA1034>3.0.CO;2-1]
New segmented poly(ester-urethane)s from renewable resources
E. RanucciPenultimo
;
2001
Abstract
The phys. and mech. properties of aliph. polyesters from monomers obtainable from renewable resources, namely, 1,3-propanediol and succinic acid, were improved by their combination with arom. urethane segments capable of establishing strong intermol. hydrogen bonds. Segmented poly(ester-urethanes) were synthesized from dihydroxy-terminated oligo(propylene succinate) chain-extended with MDI. The newly synthesized materials were exhaustively characterized by 1H NMR spectroscopy, size exclusion chromatog., differential scanning calorimetry, dynamic mech. anal., and with respect to their main static mech. properties, an Instron app. was used. The av. repeat no. of the hard segments, evaluated by NMR, ranged from 4 to 9, whereas that of the flexible segments was about 14. The degree of crystallinity, glass-transition temp., m.p., tensile strength, elongation, and Young's modulus were influenced by the ratio between hard and soft segments of the segmented copolymer in a predictable way. The results demonstrated that poly(ester-urethanes) from 1,3-propanediol and succinic acid are promising thermoplastics.File | Dimensione | Formato | |
---|---|---|---|
Liu_et_al-2001-Journal_of_Polymer_Science_Part_A-_Polymer_Chemistry.pdf
accesso riservato
Tipologia:
Publisher's version/PDF
Dimensione
176.35 kB
Formato
Adobe PDF
|
176.35 kB | Adobe PDF | Visualizza/Apri Richiedi una copia |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.