Rubber toughening of poly(lactic acid): Effect of stereocomplex formation at the rubber‐matrix interface

Ye, Suming; Lin, Tingting; Tjiu, Weng Weei; Wong, P. K.; He, Chaobin

doi:10.1002/app.38568

Cited by 27 publications

(17 citation statements)

References 47 publications

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“…For example, polymers reinforced by inorganic fillers, such as clay, graphene oxide, and carbon nanotubes, have improved modulus and tensile strength, but at the same time the ductility of the polymers may be inevitably sacrificed, leading to impaired toughness. On the other hand, brittle polymers can be effectively toughened by the addition of rubber phases, which however tend to plastically deform more easily . Attempts have been made to overcome the conflict between strength and toughness in polymer materials, among which layer‐by‐layer assembly of rigid fillers and polymers is quite a promising technique .…”

Section: Introductionmentioning

confidence: 99%

Overcome the Conflict between Strength and Toughness in Poly(lactide) Nanocomposites through Tailoring Matrix–Filler Interface

Sun

Fan

et al. 2018

Macromol. Rapid Commun.

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Strength and toughness are the two most important prerequisites for structural applications. Unfortunately, these two properties are often in conflict in materials. Here, an effective and yet practical strategy is proposed to simultaneously strengthen and toughen poly(l-lactide) (PLLA) using a simple rigid-rubber "reinforcing element." This element consists of a rigid graphene oxide (GO) sheet covalently coupled with poly(caprolactone-co-lactide) (PCLLA) rubbery layers, which can be easily synthesized and incorporated into PLLA matrix to develop composites with well-tailored GO/PLLA interfaces. It is demonstrated that by adding the "reinforcing element," i.e., GO-graft-rubber-graft-polyd-lactide), PLLA exhibits higher strength and higher toughness, which could be attributed to the synergy of rigid GO and rubbery PCLLA working in tandem during deformation. It is further demonstrated that this strategy can also be applied to other filler systems, such as clay and particulate polyhedral oligomeric silsesquioxane, and other polymer systems, such as poly(methyl methacrylate). The strategy could be considered as a general design principle for reinforcing materials where both strength and toughness are the key concerns.

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Section: Introductionmentioning

confidence: 99%

Overcome the Conflict between Strength and Toughness in Poly(lactide) Nanocomposites through Tailoring Matrix–Filler Interface

Sun

Fan

et al. 2018

Macromol. Rapid Commun.

Self Cite

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“…Commonly, polymers functionalized with maleate (nonacrylate [13][14][15][16][17][18][19] ) and glycidyl methacrylate groups (acrylate [20][21][22][23][24][25][26][27][28][29][30] ) are often employed. Additives containing these functionalities can be perfectly combined with PLA, especially if they are constituted by a common skeleton and provide polymer blends with improved ductility and strength.…”

Section: Introductionmentioning

confidence: 99%

Improvements in mechanical strength and thermal stability of injection and compression molded components based on Poly Lactic Acids

et al. 2017

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Degradable polymers are limited by their often-insufficient mechanical and thermal properties, which limit their usage to single-use packaging items at room temperature and in dry conditions. In this respect, the present work deals with the manufacture of custom-built Poly Lactic Acids (PLAs), which are designed to be compostable, suitable for food contact and are characterized by a good compromise between mechanical properties and thermal stability. A commercial grade PLA was, therefore, compounded in a twin-screw co-rotating extruder by the use of specific additives: maleated and glycidyl methacrylate PLAs as compatibilizers/chain extenders and microlamellar talc as mineral filler/nucleation promoter. After pelletizing, the resulting compounds were melt-processed by injection and compression molding.Differential scanning calorimetry, flexural tests in static machine and top-hat cylindrical flat indentations were performed to evaluate the thermal and mechanical response of the molded components. The experimental findings show that crystallization of the PLA can be controlled by fine-tuning the compound formulation as well as by properly setting the processing parameters. In addition, achievement of the appropriate crystallization degree in the polymer can lead to molded components, which exhibit improved mechanical strength and high thermal stability. K E Y W O R D Scompostable polymer, mechanical response, melt processing, molding, thermal stability

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“…Chemical compatibilization of PLA with other polymeric materials by reactive intermediates is another viable alternative. Maleate‐ and glycidyl methacrylate‐grafted polymers (nonacrylate and acrylate) are rather common as reactive intermediates in extrusion compounding of PLA. They can combine with PLA, thus forming polymeric blends with enhanced ductility and resiliency.…”

Section: Introductionmentioning

confidence: 99%

Thermal behavior of injection‐ and compression‐molded custom‐built polylactic acids

et al. 2017

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In recent time, the quest for renewable materials for the development of packaging items is constantly increasing. The class of polylactic acids (PLAs) is the most promising one, although a broader scale commercial expansion of these polymers cannot leave unceasing enhancement of their functional properties aside, especially toughness and thermal stability. Similarly, continuous innovation in prototyping competitive easy-route solutions for material processing is another key to successful industrial applications of PLAs. In this respect, this study deals with the design and formulation of innovative custom-built PLAs for injection and compression molding, which are compostable, suitable for food contact, and characterized by a good compromise of mechanical properties and thermal resistance. Therefore, a commercial grade PLA was modified by reactive compounding extrusion with maleic anhydride (MAH)-grafted PLA (PLA-MA) and glycidyl methacrylate (GMA)-grafted PLA (PLA-GMA) and micro-lamellar talc. Material structure and thermal response of the compounds were evaluated by differential scanning calorimetry (DSC) and Fourier transform-infrared spectroscopy (FTIR). The experimental findings show that material structure and, especially, crystallization of the PLA can be controlled by fine-tuning the compound formulation. In addition, achievement of the appropriate crystallization degree in the polymer can lead to compostable composite materials with good thermal stability. Accordingly, the custom-built PLA formulations feature the potential to expand significantly the fields of application of compostable biopolymers, thus posing a valid alternative to both durable not compostable bioplastics and conventional plastics in injection and compression molding process

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Rubber toughening of poly(lactic acid): Effect of stereocomplex formation at the rubber‐matrix interface

Cited by 27 publications

References 47 publications

Overcome the Conflict between Strength and Toughness in Poly(lactide) Nanocomposites through Tailoring Matrix–Filler Interface

Overcome the Conflict between Strength and Toughness in Poly(lactide) Nanocomposites through Tailoring Matrix–Filler Interface

Improvements in mechanical strength and thermal stability of injection and compression molded components based on Poly Lactic Acids

Thermal behavior of injection‐ and compression‐molded custom‐built polylactic acids

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