Rubber‐toughened PLA blends with low thermal expansion

Jiang, Jiandi; Su, Lili; Zhang, Kun; Wu, Guozhang

doi:10.1002/app.38642

Cited by 50 publications

(45 citation statements)

References 34 publications

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“…However, diffraction peaks of SEBS‐g‐MA are shifted to 9.69° and 28.85° in PLSE10, which may be due to polar‐polar interaction, ie, interaction between carbonyl groups of PLA and anhydride groups of SEBS‐g‐MA. Similar interaction was also observed by Jiang et al in PLA/SEBS‐g‐MA blend systems.…”

Section: Resultssupporting

confidence: 87%

“…Sangeetha et al reported that impact strength was higher in PLA/SEBS‐g‐MA blends than that in PLA/SEBS, which may be due to the interaction between maleic anhydride groups in SEBS‐g‐MA and carbonyl groups of PLA. SEBS‐g‐MA copolymer is used to toughen many polymers such as polypropylene (PP), high density polyethylene, nylon‐6, nylon‐6,6 and PLA . Yoo et al reported that SEBS‐g‐MA is an effective impact modifier for PP/PLA blends.…”

Section: Introductionmentioning

confidence: 99%

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Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

Nehra

Maiti

Jacob

2017

Polymers for Advanced Techs

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In this study, sepiolite nanoclay is used as reinforcing agent for poly(lactic acid) (PLA)/(styreneethylene-butylene-styrene)-g-maleic anhydride copolymer (SEBS-g-MA) 90/10 (w/w) blend.Effects of sepiolite on thermal behavior, morphology, and thermomechanical properties of PLA/SEBS-g-MA blend were investigated. Differential scanning calorimetry results showed 7% improvement in crystallinity at 0.5 wt% of sepiolite. The nanocomposite exhibited approximately 36% increase in the tensile modulus and 17% increase in toughness as compared with the blend matrix at 0.5 and 2.5 wt% of sepiolite respectively. Field emission scanning electron microscopy and transmission electron microscopy images exhibited sepiolite-induced morphological changes and dispersion of sepiolite in both PLA and SEBS-g-MA phases. Dynamic mechanical analysis and wide angle X-ray diffraction present evidences in support of the reinforcing nature of sepiolite and phase interaction between the filler and the matrix. This study confirms that sepiolite can improve tensile modulus and toughness of PLA/SEBS-g-MA blend. Biobased polymers have received a great deal of attention because they minimize the use of petrochemical resources and are superior in eco-friendliness. 1 The poly(lactic acid) (PLA) is a biodegradable polyester with high tensile strength and modulus. However, because of its brittleness, low thermal stability, and tensile toughness, neat PLA is limited in applications. Properly modified PLA can be used in many applications like food packaging, textile, electronics, surgical sutures, drug delivery systems, and transport and building. [2][3][4][5] Techniques such as plasticization, copolymerization, and blending are used to deal with the drawbacks of PLA. Blending is a feasible option compared with other techniques because of its cost effectiveness and minimum trade-off in properties. Blending with a thermoplastic elastomer like SEBS can be an effective way to toughen PLA. The SEBS is widely used in commercial applications such as sealants, footwear, coatings, 6 automotive parts, adhesives, temperature sensors, 7 and wire insulation. Sangeetha et al 8 reported that impact strength was higher in PLA/SEBS-g-MA blends than that in PLA/SEBS, which may be due to the interaction between maleic anhydride groups in SEBS-g-MA and carbonyl groups of PLA. SEBS-g-MA copolymer is used to toughen many polymers such as polypropylene (PP), 9 high density polyethylene, 10 nylon-6, 11 nylon-6,6 12 and PLA. 8,[13][14][15] reported that SEBS-g-MA is an effective impact modifier for PP/PLA blends. However, tensile modulus and strength decreased.Various kinds of fillers such as organo-modified montmorillonite (OMMT), [16][17][18][19] carbon nanotubes (CNTs), 20-22 calcium carbonate, [23][24][25] silica, 26-28 and carbon fullerenes 29,30 are used to enhance the thermomechanical properties of PLA. Although, OMMTs and carbon nanotubes worked well with PLA, the formers need special organic treatments to get exfoliated, while the latters are expensive and are detrimen...

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Section: Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

Nehra

Maiti

Jacob

2017

Polymers for Advanced Techs

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“…12 A comprehensive review on toughening of PLA was made by Anderson et al 13 To have enhanced interactions between the materials and fine dispersion of the impact modifier, chemically complementary groups are preferred in the rubber structure for reactive blending. 16 In that study, E-GMA was compared with maleic anhydride grafted poly(styrene-ethylene/butylene-styrene) triblock elastomer (m-SEBS), and poly(ethylene-co-octene) (EOR). This leads to the utilization of glycidyl methacrylate (GMA) copolymers in PLA blends.…”

Section: Introductionmentioning

confidence: 99%

Poly(lactic acid)–layered silicate nanocomposites: The effects of modifier and compatibilizer on the morphology and mechanical properties

Cumkur

Baouz

Yilmazer

2015

J of Applied Polymer Sci

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Poly(lactic acid) (PLA) based nanocomposites were prepared to investigate the effects of types of nanoclays. Five different organically modified nanoclays (Cloisites V R 15A, 25A, and 30B, and Nanofils V R 5 and 8) were used. Two rubbery compatibilizers, ethylene-glycidyl methacrylate (E-GMA) and ethylene-butyl acrylate-maleic anhydride, were used in the nanocomposites as compatibilizer-impact modifier. The degree of clay dispersion, the chemical compatibility between the polymer matrix and the compatibilizers, and changes in the morphology and mechanical properties of the nanocomposites were investigated. The mechanical properties and the morphological studies showed that the interactions between the different compatibilizers and PLA resulted in different structures and properties; such that the dispersion of clay, droplet size of the compatibilizer, and tensile properties were distinctly dependent on the type of the compatibilizer. Compatibility between C25A, C30B, and E-GMA resulted in the best level of dispersion, leading to the highest tensile modulus and toughness among the compositions studied. In the mentioned nanocomposites, a network structure was formed owing to the high reactivity of the epoxide group of GMA towards the PLA end groups resulting in high impact toughness.

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“…We recently proposed a substantial approach to the design of polymer blends with low CLTE values . The large reduction in CLTE is not based on the addition of a low‐thermal‐expansion filler to suppress bulk expansion, but on the fine control of the micromorphology of the polymer blend.…”

Section: Introductionmentioning

confidence: 99%

“…This phenomenon has also been observed by Ono et al and Kim et al in polypropylene/elastomer systems. This approach enabled the design of polymer materials with improved dimensional stability and impact resistance …”

Section: Introductionmentioning

confidence: 99%

Rubber‐toughened polyamide‐6 with a low thermal expansion coefficient: effect of preferential distribution of rubber and inorganic filler

Zhang

Takagi

et al. 2015

Polymer International

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The effects of morphological changes on the thermal expansion, toughness and heat resistance of polyamide‐6 (PA)/styrene–ethylene–butylene–styrene (SEBS)/polyphenylene ether (PPE) blends were investigated. Compared with the typical ‘sea (PA matrix)–island (PPE domain)–lake (SEBS in PPE domain)’ morphology, an injection‐molded ternary blend with a preferential distribution of SEBS component at the interface between PA and PPE exhibited a low coefficient of linear thermal expansion (CLTE) in the flow direction. This low CLTE was ascribed to the deformation of SEBS and PA into a co‐continuous microlayer network structure during injection molding. Consequently, the expansion preferentially occurred towards the thickness direction. Further CLTE reduction either by a change in PA viscosity or by the selective location of an inorganic filler was examined, and its influences on impact strength and heat resistance are discussed based on transmission electron microscopy observations. © 2015 Society of Chemical Industry

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Rubber‐toughened PLA blends with low thermal expansion

Cited by 50 publications

References 34 publications

Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

Poly(lactic acid)/(styrene‐ethylene‐butylene‐styrene)‐g‐maleic anhydride copolymer/sepiolite nanocomposites: Investigation of thermo‐mechanical and morphological properties

Poly(lactic acid)–layered silicate nanocomposites: The effects of modifier and compatibilizer on the morphology and mechanical properties

Rubber‐toughened polyamide‐6 with a low thermal expansion coefficient: effect of preferential distribution of rubber and inorganic filler

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