End Functionalization by Ring Opening Polymerization: Influence of Reaction Conditions on the Synthesis of End Functionalized Poly(lactic Acid)

Journal of the Brazilian Chemical Society

Fernandes, Edson¹  Agüero, Lissette²  Icart, Luis P.³ 

[1] Centro Universitário Serra dos Órgãos, Teresópolis, Brazil;Universidad de la Habana, La Habana, Cuba;Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil

关键词: poly(lactic acid);    ring opening polymerization;    end group functionalized PLA;    experimental design.;   

DOI  :  10.21577/0103-5053.20170118

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

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.

【 授权许可】

CC BY