End Functionalization by Ring Opening Polymerization: Influence of Reaction Conditions on the Synthesis of End Functionalized Poly(lactic Acid)
| Autor: | Luís Maurício T.R. Lima, Marcos L. Dias, Dionisio Zaldivar Silva, Luis Peña Icart, Lissette Agüero, Daniel Ernesto Rodriguez-Fernández, Fernando G. Souza, Edson G. R. Fernandes, Maelia Z. Cuesta |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Molar
inorganic chemicals experimental design Carboxylic acid end group functionalized PLA 02 engineering and technology 01 natural sciences Aldehyde Ring-opening polymerization Catalysis chemistry.chemical_compound stomatognathic system ring opening polymerization Polymer chemistry heterocyclic compounds chemistry.chemical_classification Lactide 010405 organic chemistry organic chemicals General Chemistry Polymer 021001 nanoscience & nanotechnology 0104 chemical sciences Lactic acid chemistry poly(lactic acid) 0210 nano-technology |
| Zdroj: | Journal of the Brazilian Chemical Society, Volume: 29, Issue: 1, Pages: 108-99, Published: JAN 2018 Journal of the Brazilian Chemical Society v.29 n.1 2018 Journal of the Brazilian Chemical Society Sociedade Brasileira de Química (SBQ) instacron:SBQ |
| Popis: | In this paper, chemical functionalization of poly(lactic acid) (PLA) was carried out by using of salicyl aldehyde (SAl) and salicylic acid (SAc) as co-initiators of ring opening polymerization (ROP). Two factorial designs (22) were performed to evaluate the effects of the lactide/catalyst and co-initiator/catalyst molar ratios on the content of aldehyde or carboxylic acid end groups, thermal properties and molecular weight (Mw) of PLA. Tin(II) 2-ethylhexanoate was used as a catalyst. The co-initiator/catalyst molar ratio has a statistically significant influence on the polymer functionalization. The highest co-initiator/catalyst molar ratio of 12/1 allows the best aldehyde or carboxylic acid functionalization, independent on the lactide/catalyst molar ratio. On the other hand, the used lactide/catalyst and co-initiator/catalyst molar ratios did not show a statistically significant influence on the polymer thermal properties. Besides, co-initiator/catalyst molar ratio has a statistically significant influence on the polymer molecular weight. So, the highest co-initiator/catalyst molar ratio used (12/1) in combination with the highest lactide/catalyst ratio (125/1) produced functionalized PLA with higher molecular weights. |
| Databáze: | OpenAIRE |
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