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Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments

G. Prevec
E. Žagar
M. Žigon

Puni tekst: engleski, pdf (575 KB) str. 365-373 preuzimanja: 387* citiraj
APA 6th Edition
Prevec, G., Žagar, E. i Žigon, M. (2006). Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments. Kemija u industriji, 55 (9), 365-373. Preuzeto s https://hrcak.srce.hr/6696
MLA 8th Edition
Prevec, G., et al. "Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments." Kemija u industriji, vol. 55, br. 9, 2006, str. 365-373. https://hrcak.srce.hr/6696. Citirano 09.08.2020.
Chicago 17th Edition
Prevec, G., E. Žagar i M. Žigon. "Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments." Kemija u industriji 55, br. 9 (2006): 365-373. https://hrcak.srce.hr/6696
Harvard
Prevec, G., Žagar, E., i Žigon, M. (2006). 'Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments', Kemija u industriji, 55(9), str. 365-373. Preuzeto s: https://hrcak.srce.hr/6696 (Datum pristupa: 09.08.2020.)
Vancouver
Prevec G, Žagar E, Žigon M. Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments. Kemija u industriji [Internet]. 2006 [pristupljeno 09.08.2020.];55(9):365-373. Dostupno na: https://hrcak.srce.hr/6696
IEEE
G. Prevec, E. Žagar i M. Žigon, "Carboxylated Polyurethanes Containing Hyperbranched Polyester Soft Segments", Kemija u industriji, vol.55, br. 9, str. 365-373, 2006. [Online]. Dostupno na: https://hrcak.srce.hr/6696. [Citirano: 09.08.2020.]

Sažetak
hyperbranched polyester soft segments (HB PU) with functional carboxylic groups in order to enable the preparation of stable HB PU dispersions. Carboxylated hyperbranched polyurethanes were synthesized using a hyperbranched polyester based on 2,2-bis(methylol)propionic acid of the fourth pseudo-generation (BoltornŽ H40) and hexamethylene (HDI) or isophorone diisocyanate (IPDI). The reactivity of hyperbranched polyester with HDI was lower than expected, possibly due to the presence of less reactive hydroxyl groups in the linear repeat units. A gel was formed at mole ratios rNCO/OH = 1:2 or 1:4. The synthesis of HB PU was performed with partly esterified hyperbranched polyester with lowered hydroxyl functionality. The carboxyl groups were incorporated in the HB PU backbone by reaction of residual hydroxyl groups with cis-1,2-cyclohexanedicarboxylic anhydride. HB PU aqueous dispersions were stable at least for two months, although their films were brittle. The tensile strength and Young's modulus of blends of linear and HB PU decreased with increasing content of HB PU whereas elongation at break remained nearly constant, which was explained in terms of looser chain packing due to more open tree-like hyperbranched structures.

Ključne riječi
polyurethanes: polyurethane anionomers; hyperbranched polymers; aqueous dispersions

Hrčak ID: 6696

URI
https://hrcak.srce.hr/6696

[hrvatski]

Posjeta: 797 *