Properties of aliphatic hyperbranched polyesters in dilute solutions
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The results of an investigation of the influence of the synthesis procedure, number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step procedure were investigated. The obtained results show that the values of [η] and R η for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the consequence of the presence of side-reaction products, formed during the synthesis. The appearance of these s...ide-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc were used as solvents. The values of the "shrinking" factor, g', were calculated for all investigated AHBPs.
Кључне речи:
Aliphatic hyperbranched polyesters / Dilute solutions / GPC / Limiting viscosity numberИзвор:
Journal of the Serbian Chemical Society, 2007, 72, 12, 1493-1506Издавач:
- Serbian Chemical Society
DOI: 10.2298/JSC0712493V
ISSN: 0352-5139
WoS: 000252412100031
Scopus: 2-s2.0-36949039425
Институција/група
Tehnološko-metalurški fakultetTY - JOUR AU - Vuković, Jasna AU - Lechner, Manfred D. AU - Jovanović, Slobodan PY - 2007 UR - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5498 AB - The results of an investigation of the influence of the synthesis procedure, number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step procedure were investigated. The obtained results show that the values of [η] and R η for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the consequence of the presence of side-reaction products, formed during the synthesis. The appearance of these side-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc were used as solvents. The values of the "shrinking" factor, g', were calculated for all investigated AHBPs. PB - Serbian Chemical Society T2 - Journal of the Serbian Chemical Society T1 - Properties of aliphatic hyperbranched polyesters in dilute solutions EP - 1506 IS - 12 SP - 1493 VL - 72 DO - 10.2298/JSC0712493V ER -
@article{ author = "Vuković, Jasna and Lechner, Manfred D. and Jovanović, Slobodan", year = "2007", abstract = "The results of an investigation of the influence of the synthesis procedure, number of pseudo generations and degree of branching of hydroxy-functional aliphatic hyperbranched polyesters (AHBP) on the values of limiting viscosity number, [η], hydrodynamic radius, Rη, molar mass and polydispersity index, Q, are presented in this paper. Two series of AHBP, synthesized from 2,2-bis(hydroxymethyl)propionic acid and di-trimethylolpropane using a pseudo-one-step and a one-step procedure were investigated. The obtained results show that the values of [η] and R η for all examined samples are the highest in a 0.7 mass % solution of LiCl in N,N-dimethylacetamide (LiCl/DMAc), which indicates that this solvent is the best from the investigated ones. The values of [η] in N-methyl-2-pyrrolidinone (NMP) increased up to the sixth pseudo generation, after which a slight decrease occurred as the consequence of the presence of side-reaction products, formed during the synthesis. The appearance of these side-reaction products was also confirmed from the characteristic GPC chromatograms. For the samples of AHBP synthesized using the pseudo-one-step procedure, a good linear dependence between log [η] and log Mw was obtained up to the fifth pseudo generation, when LiCl/DMAc, NMP and DMAc were used as solvents. The values of the "shrinking" factor, g', were calculated for all investigated AHBPs.", publisher = "Serbian Chemical Society", journal = "Journal of the Serbian Chemical Society", title = "Properties of aliphatic hyperbranched polyesters in dilute solutions", pages = "1506-1493", number = "12", volume = "72", doi = "10.2298/JSC0712493V" }
Vuković, J., Lechner, M. D.,& Jovanović, S.. (2007). Properties of aliphatic hyperbranched polyesters in dilute solutions. in Journal of the Serbian Chemical Society Serbian Chemical Society., 72(12), 1493-1506. https://doi.org/10.2298/JSC0712493V
Vuković J, Lechner MD, Jovanović S. Properties of aliphatic hyperbranched polyesters in dilute solutions. in Journal of the Serbian Chemical Society. 2007;72(12):1493-1506. doi:10.2298/JSC0712493V .
Vuković, Jasna, Lechner, Manfred D., Jovanović, Slobodan, "Properties of aliphatic hyperbranched polyesters in dilute solutions" in Journal of the Serbian Chemical Society, 72, no. 12 (2007):1493-1506, https://doi.org/10.2298/JSC0712493V . .