Toughening Polylactide

Anderson, Kelly K.; Schreck, Kathleen M.; Hillmyer, Marc A.

doi:10.1080/15583720701834216

Cited by 542 publications

(431 citation statements)

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“…Among those, polymer blending with flexible or elastic polymers has proved to be the most cost-effective way to improve the toughness [6,16]. It has been noted that directly blending PLLA with most flexible or elastic polymers usually leads to low-performance blends, due to the macro-phase-separated morphology and weak interfacial adhesion arising from the immiscibility between the blending components [17].…”

Section: Introductionmentioning

confidence: 99%

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Zeng

et al. 2017

Sci. China Mater.

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Inherent brittleness and low heat resistance are the two major obstacles that hinder the wide applications of poly(L-lactide) (PLLA). In this study, we report a fully biobased, highly toughened and heat-resistant PLLA ternary blend, which was prepared by dynamic vulcanization of PLLA with poly(D-lactide) (PDLA) and an unsaturated bioelastomer (UBE). The results indicated that during dynamic vulcanization PDLA cocrystallized with PLLA to form stereocomplex (SC) crystallites, which not only enhanced the molecular entanglement but also accelerated the crystallization rate of PLLA matrix. With increase in the content of PDLA, the matrix molecular entanglement increased while phase-separation was enhanced, which enabled the impact strength to increase first and then decrease. The ternary blends containing 10 wt.% PDLA showed the highest impact strength. The presence of SC crystallites makes it possible to achieve a fully sustainable PLLA/VUB/PDLA ternary blend with highly crystalline matrix under conventional injection molding, due to the high nucleation efficiency of SC towards crystallization of PLLA. The highly crystalline ternary blend showed excellent heat resistance and better impact toughness than high impact polystyrene.

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Section: Introductionmentioning

confidence: 99%

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Zeng

et al. 2017

Sci. China Mater.

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“…Many factors are believed to cause the deterioration in mechanical properties of PLA/starch blends. First, PLA has an inherent brittleness as evidenced by its relatively low tensile strain at break, and toughness [10,11] . Another explanation is linked to the inherent incompatibility between the hydrophilic starch and the hydrophobic PLA that affects the interfacial adhesion [5,7,[12][13][14][15] .…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/thermoplastic starch sheets: effect of adipate esters on the morphological, mechanical and barrier properties

et al. 2016

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SbstractBlends of poly(lactic acid) (PLA) and thermoplastic starch (TPS) plasticized with adipate esters (diisodecyl adipate and diethyl adipate) having different molecular weight were used to produce sheets. The calendering-extrusion process at a pilot scale was used, and the mechanical, barrier, and morphological characterization of the obtained materials were performed. The increase in the TPS content affected the mechanical properties of the sheets by increasing the elongation and decreasing the rigidity. TPS conferred a more hydrophilic character to the sheets, as observed from the water vapor permeability results. The sheets plasticized with diisodecyl adipate (DIA), having a higher molecular weight, had better mechanical and barrier properties than diethyl adipate (DEA) plasticized sheets, indicating that DIA was more effective as plasticizer. Micrographs obtained by confocal laser microscopy and scanning electron microscopy showed different morphologies when different proportions of PLA and TPS were used (dispersed or co-continuous structures), which were strongly associated with the mechanical and barrier properties.

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“…However, the brittle nature of PLA and other commercial aliphatic polyesters such as poly(butylene succinate) and poly (hydroxyalkanoate)s has thwarted their broad-based utility. Expanded market penetration will pivot on the development of products endowed with tunable combinations of properties, e.g., soft, ductile, and tough (17,18). Among myriad strategies that have been used to this end, PLA-containing block polymers represent a particularly attractive approach.…”

mentioning

confidence: 99%

Scalable production of mechanically tunable block polymers from sugar

Xiong¹,

Schneiderman

Bates³

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

162

205

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Significance In recent years there has been extensive research toward the development of sustainable polymeric materials. However, environmentally benign, bioderived polymers still represent a woefully small fraction of plastics and elastomers on the market today. To displace the widely useful oil-based polymers that currently dominate the industry, a bioderived synthetic polymer must be both cost and performance competitive. In this paper we address this challenge by combining the efficient bioproduction of β-methyl-δ-valerolactone with controlled polymerization techniques to produce economically viable block polymer materials with mechanical properties akin to commercially available thermoplastics and elastomers.

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Toughening Polylactide

Cited by 542 publications

References 0 publications

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Fully bio-based, highly toughened and heat-resistant poly(L-lactide) ternary blends via dynamic vulcanization with poly(D-lactide) and unsaturated bioelastomer

Poly(lactic acid)/thermoplastic starch sheets: effect of adipate esters on the morphological, mechanical and barrier properties

Scalable production of mechanically tunable block polymers from sugar

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