More on the poly(L‐lactide) prepared using ferrous acetate as catalyst

Abstract

Polylactides were prepared by ring-opening polymerization (ROP) in bulk using as catalyst either stannous 2-ethylhexanoate at a monomer to catalyst ratio of 2000, or ferrous acetate (Fe(OAc) 2 ) at monomer to catalyst ratios of 500, 1000, 2000 and 3000. The crystallization behaviour was studied for the prepared polymers as well as the degradation behaviour both in laboratory and natural compost environments by using differential scanning calorimetry, size exclusion chromatography, Xray diffractiometry and microscopy. No differences were apparent due to the choice or amount of catalyst used, except for those which could be related to the increased racemization when the Fe(OAc) 2 was used.

Synthesis and characterization of Ti(Tbse)2 and its application as a catalyst for ROP of rac‐Lactide

“…ROP of the lactide initiated or catalyzed by metal alkoxides is the major polymerization method used to synthesize PLA 3, 4. Recently, many metal alkoxides such as aluminium,5–7 magnesium,8–10 lithium,11, 12 calcium,13, 14 stannous,15, 16 indium,17, 18 zinc,19–21 rhodium,22 yttrium23 and iron24, 25 have been reported to be effective initiators or catalysts for the ROP of lactides, giving polymers with both high and controlled molecular weights 26…”

Exploring the effect of alkyl end group on poly(L-lactide) oligo-esters. Synthesis and characterization

“…Poly(L-lactide) (PLLA) 1 is an important aliphatic polyester with degradable properties and potentials application in biomedical area [1]. Typically, PLLA is obtained by ring-opening polymerization (ROP) of L-lactide (L-LA) in presence of a catalyst as tin (II) 2-ethylhexanoate or tin octato Sn(Oct) 2 [1][2][3]. Sn(Oct) 2 is the most important catalyst in ROP of lactones because was approved by Food and Drugs Administration (FDA) as food additive [4].…”

“…Sn(Oct) 2 is the most important catalyst in ROP of lactones because was approved by Food and Drugs Administration (FDA) as food additive [4]. In ROP of lactones is common the use of initiators, for example: primary and secondary aliphatic alcohols (ROH) [2]. Initiator (ROH) can react with Sn(Oct) 2 and produce a tin alkoxide (Oct-Sn-OR) by transfer reaction [5,6], where tin alkoxide is active specie in the ROP of lactones as L-LA [6], as result a polyester with aliphatic (R) and hydroxyl (OH) end group can be obtained.…”

Synthesis of poly(vinyl alcohol)‐graft‐poly(ε‐caprolactone) and poly(vinyl alcohol)‐graft‐poly(lactide) in melt with magnesium hydride as catalyst

“…Non‐toxic Ca, Fe, and Mg based catalysts or co‐initiator are preferable. Recently, ROP was investigated, for example, in the presence of calcium alkoxide,6 ferric alkoxide,7 ferrous acetate,8 and natural amino acids9 considering that the biocompatibility and in vivo safety of thus‐obtained polymers must be satisfying for medical and pharmaceutical purpose.…”