Dynamic mechanical properties of PLA/PHBV, PLA/PCL, PHBV/PCL blends and their nanocomposites with TiO2 as nanofiller

Mofokeng, J.P.; Luyt, A. S.

doi:10.1016/j.tca.2015.05.019

Cited by 72 publications

(70 citation statements)

References 45 publications

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“…The decrease in tan δ peak height at sepiolite concentration >0.5 wt% may be due to mechanical restraint, which led to decrease in chain relaxation. Similar results were also reported by Prashantha et al and Mofokeng and Luyt …”

Section: Resultssupporting

confidence: 92%

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: 92%

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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“…The spectrum of PCL75PLA25 shows all of the characteristic peaks of PCL and PLA, and no new peaks are detected in its spectrum. 17 Spherical geometry of HA nanoparticles with low agglomeration is visible in Figure 2(c). The FTIR analysis of PCL75PLA25HA3 nanocomposite shows that the position of carbonyl groups is shifted to lower wave numbers.…”

Section: Ftir and Wide-angle X-ray Scattering Analysismentioning

confidence: 95%

“…In a similar study, it has been demonstrated that the nanoparticles of TiO 2 has high tendency to position in the polymeric phase of PLA. 17 Spherical geometry of HA nanoparticles with low agglomeration is visible in Figure 2(c).…”

Section: Ftir and Wide-angle X-ray Scattering Analysismentioning

confidence: 95%

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Shojaei

Nikuei

Goodarzi

et al. 2018

J of Applied Polymer Sci

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In this study, biodegradable polymer blends and their nanocomposites were prepared using poly(ε-caprolactone) (PCL) and poly(lactic acid) (PLA) as blending components and hydroxyapatite (HA) nanoparticles as reinforcement. X-ray diffraction spectra showed that the presence of HA nanoparticles enhanced the intensity of the peaks (100) and (200) corresponding to the PCL's crystalline planes. The transmission electron microscopy images confirmed the high tendency of HA nanoparticles to locate in the PLA phase. The water uptake values of samples measured at pH 4 were more than those measured at other pH values. The weight loss behavior of blends in acidic medium was completely different from that in basic and neutral media. The Williams-Landel-Ferry equation and time-temperature superposition principle were applied to the creep compliance of the samples and their master curves were determined at reference temperature of 30 C, and the mechanical properties of samples were predicted in other conditions. The effect of pH on the creep-recovery response of studied samples was analyzed. From this analysis, it could be found that at pH 4, the creep stain increased, while, at pH 7, there was no a significant change in the viscoelastic property.

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“…These traditionally include polymer surface modification by chemical reactions, and the incorporation of block-copolymers [2]. More recently, the compatibilizing role of nanoparticles has been explored for nano-clay [2], titanium dioxide (TiO 2 ) [11], zinc oxide (ZnO), silica (SiO 2 ), aluminium oxide (Al 2 O 3 ), silicon nitride (Si 3 N 4 ) [4,12], polyhedral oligomeric silsesquioxanes (POSS) [13], graphene oxide (GO), etc. [14,15].…”

Section: Introductionmentioning

confidence: 99%

“…For example, different flexible polymers, such as poly(hydroxybutyrate) (PHB), poly(ɛ-caprolactone) (PCL), poly(ethylene glycol) (PEG), and poly(butylene succinate) (PBS), have been used to toughen PLLA. In the present work we focused on PLLA/PBS blends, given the biodegradability and good processability of PBS [12,[20][21][22][23][24][25]. A variety of compounds has been added to blends of these two polymers, with the aim of improving their physical properties.…”

Section: Introductionmentioning

confidence: 99%

Correlating the morphology of poly(L-lactide)/poly(butylene succinate)/graphene oxide blends nanocomposites with their crystallization behavior

Fenni¹,

Monticelli²,

Conzatti³

et al. 2018

Express Polym. Lett.

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Abstract. Bio-based blend nanocomposites of poly(L-lactic acid) (PLLA) and poly(butylene succinate) (PBS), with different concentrations (from 0.1 to 0.5 wt%) of graphene oxide (GO), are prepared via solution dispersion of PBS/GO followed by melt blending with PLLA in a 70/30 PLLA/PBS weight ratio. Scanning and Transmission Electron Microscopy reveals micron-sized droplets of PBS in the PLLA matrix with the GO nanofiller preferentially found in the PBS phase. The GO acts as nucleating agent for both semicrystalline polymers. The nanofiller nucleating effect is compared to the one of own selfnuclei for each polymer, to define a convenient nucleating efficiency (NE) scale. A value of around 80% is determined for GO towards PBS, among the highest NEs ever reported for this polymer. On the other hand, the efficiency in nucleating PLLA is equal to a modest 15%, also due to the uneven distribution of the nanofiller in the two polymers. A close relationship between the nanocomposite morphology and crystallization behavior of the two different polymers is thus established.

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Dynamic mechanical properties of PLA/PHBV, PLA/PCL, PHBV/PCL blends and their nanocomposites with TiO2 as nanofiller

Cited by 72 publications

References 45 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

Disclosing the role of surface and bulk erosion on the viscoelastic behavior of biodegradable poly(ε‐caprolactone)/poly(lactic acid)/hydroxyapatite nanocomposites

Correlating the morphology of poly(L-lactide)/poly(butylene succinate)/graphene oxide blends nanocomposites with their crystallization behavior

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