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Properties of aliphatic hyperbranched polyesters in dilute solutions
dc.creator | Vuković, Jasna | |
dc.creator | Lechner, Manfred D. | |
dc.creator | Jovanović, Slobodan | |
dc.date.accessioned | 2023-01-18T14:24:39Z | |
dc.date.available | 2023-01-18T14:24:39Z | |
dc.date.issued | 2007 | |
dc.identifier.issn | 0352-5139 | |
dc.identifier.uri | http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5498 | |
dc.description.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. | sr |
dc.language.iso | en | sr |
dc.publisher | Serbian Chemical Society | sr |
dc.rights | openAccess | sr |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.source | Journal of the Serbian Chemical Society | sr |
dc.subject | Aliphatic hyperbranched polyesters | sr |
dc.subject | Dilute solutions | sr |
dc.subject | GPC | sr |
dc.subject | Limiting viscosity number | sr |
dc.title | Properties of aliphatic hyperbranched polyesters in dilute solutions | sr |
dc.type | article | sr |
dc.rights.license | BY | sr |
dc.citation.epage | 1506 | |
dc.citation.issue | 12 | |
dc.citation.rank | M23 | |
dc.citation.spage | 1493 | |
dc.citation.volume | 72 | |
dc.identifier.doi | 10.2298/JSC0712493V | |
dc.identifier.fulltext | http://TechnoRep.tmf.bg.ac.rs/bitstream/id/14320/0352-51390712493V.pdf | |
dc.identifier.scopus | 2-s2.0-36949039425 | |
dc.identifier.wos | 000252412100031 | |
dc.type.version | publishedVersion | sr |