A Study for Graft-Reaction of PEG onto PLA Chains by Reactive Processing

Mechanical properties and morphological changes of poly(lactic acid)/polycarbonate/poly(butylene adipate‐co‐terephthalate) blend through reactive processing

“…After the scission of organic peroxide occurs, the free radical can easily extracts a secondary hydrogen from the α‐carbon atom of PBAT, and then β‐scission occurs to yield a primary radical and the α, β‐unsaturated carbonyl chain, as illustrated in Scheme 11. On the other hand, PLA has tertiary carbon atoms of which the generated radical is stabilized even under melt conditions, which resulted in crosslinking,16 so that β‐scission of PLA does not occur by the addition of DCP. When taking these results into consideration, we proposed the most probable structures derived from the reaction of the PLA/PBAT blend and DCP as follows: (1) branched structures of PLA via homogeneous radical coupling reactions, (2) PBAT‐grafted PLA via radical coupling between primary radicals of PBAT and tertiary radicals of PLA, (3) branched structures of PLA and PBAT via heterogeneous radical coupling reactions between ternary radicals of PLA and secondary radicals of PBAT, (4) branched structures of PBAT via homogeneous radical coupling reactions on the α, β‐unsaturated carbonyl chain ends.…”

“…Functionalization of PLA with maleic anhydride and radical initiators (POs) has been achieved by melt blending using a twin‐screw extruder10 and by solution reactions with solvents such as toluene 11. Multiphase polymeric materials using maleated PLA have been attained in PLA/starch12–15 and PLA/poly(ethylene glycol) (PEG) blends 16. Another successful application of RP is the addition of POs to several PLA blends, such as PLA/poly(ε‐caprolactone) (PCL),17–20 PLA/poly(butylene succinate) (PBS),19 PLA/poly(butylene succinate‐ co ‐adipate),20 PLA/PBAT,21 PLA/polyurethane,22 PLA/ PEG glycidyl ether23 by simultaneous melt blending.…”

Modifications of Poly(lactic Acid) with Blends and Plasticization for Tenacity and Toughness Improvement

“…It is, therefore, not surprising that PLA has been blended with several synthetics and biopolymers to enhance the properties of PLA and obtain novel materials. PLA has been blended with collagen, poly(butylenes succinate adipate), polyethylene glycol [31][32][33][34][35][36][37][38][39][40][41][42], poly(methyl methacrylate), polyethylene, poly(ethylene oxide) and poly(butylenes adipate-coterephthalate) to produce materials with superior properties like as toughness, modulus, and impact strength, as well as thermal stability as compared to pure polymers [30].…”