Migration resistant glucose esters as bioplasticizers for polylactide

Abstract

Environmental and sustainability issues have catalyzed efforts to replace traditional polymer additives with biobased alternatives. Glucose pentaacetate (GPA) and sucrose octaacetate (SOA) as model commercial saccharide esters and three synthesized glucose hexanoate esters (GHs) were evaluated as bioplasticizers for polylactide (PLA). For the GHs different reaction times were utilized to reach plasticizers with different number of hexanoate groups to establish how the degree of substitution influences miscibility and migration resistance of the plasticizers. The synthesized GHs, GPA, and SOA all showed good miscibility with PLA. Largest improvements in strain at break were observed for the PLA films containing GH plasticizers. These films also exhibited simultaneous increase in stress at break as compared to plain PLA. The GH plasticizers had low tendency to migrate during aging in water and this migration resistance increased with increasing degree of substitution. The GHs are, thus, promising plasticizer alternatives for bioplastics as they also retain the biodegradable nature of these biobased materials.

Poly(lactide)-g-poly(butylene succinate-co-adipate) with High Crystallization Capacity and Migration Resistance

“…The larger reduction of T g shown in the present study could be explained by the lower T g (<−50 °C) of the synthesized PBSA plasticizer, which is caused by the combination of more flexible structure due to the adipic acid units and much lower molecular weight and agrees well with previous values reported for PLA plasticized with low molecular weight ester plasticizers [18,28]. Blending 20 wt % of glucose ester ( M n ≤ 1030 g/mol) with PLA could reduce T g to about 25 °C, which was 30 °C lower than the T g of neat PLA [28]. Blending PLA with 20 wt % oligomeric PHB led to a 29 °C decrease in T g while grafting the same amount of oligomeric PHB resulted in a 25 °C decreasing compared to neat PLA [18].…”

“…Plasticizer migration resistance could also be improved when branched plasticizers were used [18,28,29,30]. It has been shown that blending PBSA into PLA could facilitate crystallization of PLA and mitigate the brittleness of PLA when the phase separation could be reduced by adding compatibilizer or annealing the blends [20,27].…”

Flammability and flame‐retardant mechanism of high density polyethylene/wood fiber/modified ammonium polyphosphate composite

“…The results indicated that the char residue was rich in O, P, C, and also contained N element. This was coincidence with the results of the FT-IR analysis of the condensed products at different temperatures [25].…”

Electrochemical Study of Interfacially Synthesized Polycarbazole with Different Oxidants

“…Notably,p erfect hollow spheres,t ubes, and fibers of conducting polymers are synthesized by controlling the synthesis approach. [38][39][40][41] In the present case, of interfacial polymerization, the redox reactionb asically occurs at the aqueous-organic interfacial region, as shown in Figure 1, where aC zi so xidized by oxidants APS or KMnO 4 with preferential concurrent doping of the NH group through as imple acid-base reaction. The NH group of Cz is expected to be ad riving force for the self-assembly of the polymer,s imilart ot he aggregation of polyaniline into hollow spheres.…”