Matches in SemOpenAlex for { <https://semopenalex.org/work/W1663455893> ?p ?o ?g. }
Showing items 1 to 65 of
65
with 100 items per page.
- W1663455893 endingPage "29" @default.
- W1663455893 startingPage "17" @default.
- W1663455893 abstract "This work deals with the modification reaction of dextran with ethyl and butyl chloroformate using tertiary amines as catalyst/acceptor systems and the DMF/LiCl system as solvent. The structure of the resulting polymers was determined by means of IR, 1H and 13C NMR spectroscopy as well as by chemical analyses. The reaction rate was found to increase in the following order: N,N′-dimethylaniline < pyridine < triethylamine. The presence of cyclic carbonates was observed when triethylamine was used as catalyst. A linear dependence of the reaction rate on polymer and pyridine concentrations and a more complex dependence on the n-alkyl chloroformate concentration were found. Reaction rate and yield decrease with increasing amount of LiCl in the solvent medium and increase with increasing chain length of the n-alkyl chloroformate. The activation energy was found to be 64 kJ/mol (15,3 kcal/mol). The equilibrium water content (EWC) values decreases progressively when either the content of carbonate groups or the side chain length increases. The hydrolysis in the heterogeneous phase showed that the time required for the polymer solubilization is dependent upon the nature of the carbonate groups, the temperature as well as the pH value of the medium. Dextranase was found to be inactive in the hydrolysis of water-insoluble modified dextrans. However, the hydrolysis takes place when water-soluble modified dextrans were used." @default.
- W1663455893 created "2016-06-24" @default.
- W1663455893 creator A5013136838 @default.
- W1663455893 creator A5053943591 @default.
- W1663455893 date "1985-01-01" @default.
- W1663455893 modified "2023-10-15" @default.
- W1663455893 doi "https://doi.org/10.1002/macp.1985.021860103" @default.
- W1663455893 hasPublicationYear "1985" @default.
- W1663455893 type Work @default.
- W1663455893 sameAs 1663455893 @default.
- W1663455893 citedByCount "25" @default.
- W1663455893 countsByYear W16634558932013 @default.
- W1663455893 countsByYear W16634558932015 @default.
- W1663455893 countsByYear W16634558932016 @default.
- W1663455893 countsByYear W16634558932018 @default.
- W1663455893 crossrefType "journal-article" @default.
- W1663455893 hasAuthorship W1663455893A5013136838 @default.
- W1663455893 hasAuthorship W1663455893A5053943591 @default.
- W1663455893 hasConcept C155574463 @default.
- W1663455893 hasConcept C161790260 @default.
- W1663455893 hasConcept C178790620 @default.
- W1663455893 hasConcept C185592680 @default.
- W1663455893 hasConcept C188027245 @default.
- W1663455893 hasConcept C2779485729 @default.
- W1663455893 hasConcept C2780071497 @default.
- W1663455893 hasConcept C2780263894 @default.
- W1663455893 hasConcept C2780471494 @default.
- W1663455893 hasConcept C2781200978 @default.
- W1663455893 hasConcept C2781283055 @default.
- W1663455893 hasConcept C521977710 @default.
- W1663455893 hasConcept C94412978 @default.
- W1663455893 hasConceptScore W1663455893C155574463 @default.
- W1663455893 hasConceptScore W1663455893C161790260 @default.
- W1663455893 hasConceptScore W1663455893C178790620 @default.
- W1663455893 hasConceptScore W1663455893C185592680 @default.
- W1663455893 hasConceptScore W1663455893C188027245 @default.
- W1663455893 hasConceptScore W1663455893C2779485729 @default.
- W1663455893 hasConceptScore W1663455893C2780071497 @default.
- W1663455893 hasConceptScore W1663455893C2780263894 @default.
- W1663455893 hasConceptScore W1663455893C2780471494 @default.
- W1663455893 hasConceptScore W1663455893C2781200978 @default.
- W1663455893 hasConceptScore W1663455893C2781283055 @default.
- W1663455893 hasConceptScore W1663455893C521977710 @default.
- W1663455893 hasConceptScore W1663455893C94412978 @default.
- W1663455893 hasIssue "1" @default.
- W1663455893 hasLocation W16634558931 @default.
- W1663455893 hasOpenAccess W1663455893 @default.
- W1663455893 hasPrimaryLocation W16634558931 @default.
- W1663455893 hasRelatedWork W2046890942 @default.
- W1663455893 hasRelatedWork W2052305184 @default.
- W1663455893 hasRelatedWork W2072189959 @default.
- W1663455893 hasRelatedWork W2352509919 @default.
- W1663455893 hasRelatedWork W237176199 @default.
- W1663455893 hasRelatedWork W2949194932 @default.
- W1663455893 hasRelatedWork W2950828187 @default.
- W1663455893 hasRelatedWork W2951585822 @default.
- W1663455893 hasRelatedWork W2951635156 @default.
- W1663455893 hasRelatedWork W4247529016 @default.
- W1663455893 hasVolume "186" @default.
- W1663455893 isParatext "false" @default.
- W1663455893 isRetracted "false" @default.
- W1663455893 magId "1663455893" @default.
- W1663455893 workType "article" @default.