Results 241 to 250 of about 241,511 (301)
Degradation Products of Aliphatic and Aliphatic–Aromatic Polyesters
, 2008 Analysis of degradation products needs to be included in degradability testing to ensure the environmental adaptability of degradable polymers. Identification of breakdown products from environmental degradation is important for understanding the degradation process, environmental interaction and impact of degradable polymers.
Minna Hakkarainen +1 more
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British Polymer Journal, 1984
The synthesis and characterisation of ten fluorinated aliphatic, aliphatic and aliphatic ether polycarbonates is described using polycondensation of the appropriate biscarbonates. The materials have been characterised by elemental and spectroscopic analysis, and their Tg values obtained and discussed.
W. James Feast, Paul J. Tweedale
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The synthesis and characterisation of ten fluorinated aliphatic, aliphatic and aliphatic ether polycarbonates is described using polycondensation of the appropriate biscarbonates. The materials have been characterised by elemental and spectroscopic analysis, and their Tg values obtained and discussed.
W. James Feast, Paul J. Tweedale
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Aliphatic Epoxide Carboxylation
Annual Review of Biochemistry, 2003▪ Abstract Aliphatic epoxides (epoxyalkanes) are highly reactive electrophilic molecules that are formed from the monooxygenase-catalyzed epoxidation of aliphatic alkenes. The bacterial metabolism of short-chain epoxyalkanes occurs by a three-step pathway resulting in net carboxylation to β-ketoacids.
Scott A, Ensign, Jeffrey R, Allen
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Recueil des Travaux Chimiques des Pays-Bas, 1936
AbstractThe high boiling amines, obtained by the interaction of 1: 3‐dibromo‐propane and 1: 2‐diamino‐ethane hydrate, have been investigated. The lower terms contain straight chains of dimethylene and trimethylene groups separated by nitrogen atoms but in the higher boiling fractions cyclic amines are present.
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AbstractThe high boiling amines, obtained by the interaction of 1: 3‐dibromo‐propane and 1: 2‐diamino‐ethane hydrate, have been investigated. The lower terms contain straight chains of dimethylene and trimethylene groups separated by nitrogen atoms but in the higher boiling fractions cyclic amines are present.
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Biomacromolecules, 2004
The anaerobic degradability of natural and synthetic polyesters is investigated applying microbial consortia (3 sludges, 1 sediment) as well as individual strains isolated for this purpose. In contrast to aerobic conditions, the natural homopolyester polyhydroxybutyrate (PHB) degrades faster than the copolyester poly(hydroxybutyrate-co-hydroxyvalerate)
Dunja-Manal, Abou-Zeid +2 more
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The anaerobic degradability of natural and synthetic polyesters is investigated applying microbial consortia (3 sludges, 1 sediment) as well as individual strains isolated for this purpose. In contrast to aerobic conditions, the natural homopolyester polyhydroxybutyrate (PHB) degrades faster than the copolyester poly(hydroxybutyrate-co-hydroxyvalerate)
Dunja-Manal, Abou-Zeid +2 more
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Reactions of aliphatic methanesulfonates
Chemistry and Physics of Lipids, 1973Abstract Aliphatic methanesulfonates (mesylates) are obtained in high yields by reacting the corresponding alcohols with methanesulfonyl chloride. Reactions of mesylates proceed specifically and result in good yields. When working with unsaturated compounds, isomerization does not occur.
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2023
Aliphatic compounds are carbon and hydrogen-containing hydrocarbon complexes and are present in almost every plant, animal and microorganism. In 1929, aliphatic hydrocarbons were first discovered by crude chemical methods. These observations were later confirmed and expanded by more sophisticated instruments, such as gas-liquid chromatography and GLC ...
Tahira Naz +3 more
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Aliphatic compounds are carbon and hydrogen-containing hydrocarbon complexes and are present in almost every plant, animal and microorganism. In 1929, aliphatic hydrocarbons were first discovered by crude chemical methods. These observations were later confirmed and expanded by more sophisticated instruments, such as gas-liquid chromatography and GLC ...
Tahira Naz +3 more
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Biodegradation of Aliphatic Polyesters
1995Aliphatic polyesters presently constitute the most attractive class of artificial polymers which can degrade in contact with living tissues or under outdoor conditions. Work has been in progress for the last two decades which has led to their applications in surgery and in pharmacology.
Suming Li, Michel Vert
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