Poly(Ethylene Glycol) as a Compatibilizer for Poly(Lactic Acid)/Thermoplastic Starch Blends

Ferrarezi, Márcia Maria Favaro; Taipina, Márcia de Oliveira; Silva, Laura C. E. da; Gonçalves, Maria do Carmo

doi:10.1007/s10924-012-0480-z

Cited by 88 publications

(71 citation statements)

References 42 publications

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“…A), a glass transition of approximately 50°C was observed. This behavior was also observed for cassava starch plasticized with poly (ethylene glycol) . Broader peaks were observed for formulations with 15 wt% of CO and especially for formulations produced with YSE, compared to formulations with higher concentrations of CO (25 wt%).…”

Section: Resultssupporting

confidence: 56%

Effects of coconut oil concentration as a plasticizer and Yucca schidigera extract as a surfactant in the preparation of extruded corn starch films

et al. 2014

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In this study, extruded films of corn starch (CS) plasticized with coconut oil (CO) (as an alternative plasticizer to glycerol) in the presence of Yucca schidigera extract (YSE) as a surfactant were investigated. It was observed that corn starch films (CSF) plasticized with a lower concentration (15 wt%) of CO showed a better equilibrium of mechanical properties, a higher WVP (5.8 ± 0.2 × 10−9 g m−1 s−1 Pa−1) and percentage of elongation (8 ± 0.5), and a lower Young modulus (99 ± 8 MPa) than those with a higher amount of plasticizer. However, films with Yucca schidigera extract (YSE) as a surfactant showed a decrease in WVP (4.9 ± 0.2 × 10−9 g m−1 s−1 Pa−1), a lower Young modulus (61 ± 2 MPa) and an increase in the percentage of elongation (13 ± 0.4). In order to describe the viscoelastic properties before the extrusion processes in materials in water suspensions and after extrusion process in CSF, rheological and DMTA analysis were performed, showing consistent behaviors for both samples.

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Section: Resultssupporting

confidence: 56%

Effects of coconut oil concentration as a plasticizer and Yucca schidigera extract as a surfactant in the preparation of extruded corn starch films

et al. 2014

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“…Furthermore, citrate esters addition also generated broader transition peaks (the full-width half-maximum increased, as indicated in Table 3 and Figure 4). This behavior describes materials with a wide range of relaxation times [27] . The presence of citrate changes the microheterogeneity of the systems, i.e., TEC or ATBC chains can cause the formation of a number of microenvironts with different compositions and different interaction densities in the blends.…”

Section: Dynamic Mechanical Analysis (Dma)mentioning

confidence: 99%

Biobased additive plasticizing Polylactic acid (PLA)

et al. 2015

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SbstractPolylactic acid (PLA) is an attractive candidate for replacing petrochemical polymers because it is from renewable resources. In this study, a specific PLA 2002D was melt-mixed with two plasticizers: triethyl citrate (TEC) and acetyl tributyl citrate (ATBC). The plasticized PLA with various concentrations were analyzed by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA), melt flow index (MFI), thermogravimetric analysis (TGA), X-ray diffraction (XRD), UV-Visible spectroscopy and plasticizer migration test. Differential scanning calorimetry demonstrated that the addition of TEC and ATBC resulted in a decrease in glass transition temperature (T g ), and the reduction was the largest with the plasticizer having the lowest molecular weight (TEC). Plasticizing effect was also shown by decrease in the dynamic storage modulus and viscosity of plasticized mixtures compared to the treated PLA. The TGA results indicated that ATBC and TEC promoted a decrease in thermal stability of the PLA. The X-ray diffraction showed that the PLA have not polymorphic crystalline transition. Analysis by UV-Visible spectroscopy showed that the two plasticizers: ATBC and TEC have no effect on the color change of the films. The weight loss plasticizer with heating time and at 100°C is lesser than at 135 °C. Migration of TEC and ATBC results in cracks and changed color of material. We have concluded that the higher molecular weight of citrate in the studied exhibited a greater plasticizing effect to the PLA.

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“…Similarly, Polyethylene glycol (PEG) enhances interfacial interaction between TPS and PLA, and increases PLA crystallization because of plasticizing effect on PLA (Ferrarezi, de Oliveira Taipina, da Silva, & do Carmo Gonç alves, 2013;Ping, Kejian, Mingyin, & Meijuan, 2013). Other compatibilizers such as maleic anhydride (MA) Zhang & Sun, 2004), PLA-g-MTPS (Wootthikanokkhan et al, 2012), PLA-g-amylose (Schwach, Six, & Avérous, 2008) have also been reported in literatures.…”

Section: Introductionmentioning

confidence: 99%

A new approach in compatibilization of the poly(lactic acid)/thermoplastic starch (PLA/TPS) blends

Akrami

Ghasemi

Azizi

et al. 2016

Carbohydrate Polymers

195

137

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a b s t r a c tIn this study, a new compatibilizer was synthesized to improve the compatibility of the poly(lactic acid)/thermoplastic starch blends. The compatibilizer was based on maleic anhydride grafted polyethylene glycol grafted starch (mPEG-g-St), and was characterized using Fourier transform infrared spectroscopy (FTIR), dynamic mechanical thermal analysis (DMTA) and back titration techniques. The results indicated successful accomplishment of the designed reactions and formation of a starch cored structure with many connections to m-PEG chains. To assess the performance of synthesized compatibilizer, several PLA/TPS blends were prepared using an internal mixer. Consequently, their morphology, dynamic-mechanical behavior, crystallization and mechanical properties were studied. The compatibilizer enhanced interfacial adhesion, possibly due to interaction between free end carboxylic acid groups of compatibilizer and active groups of TPS and PLA phases. In addition, biodegradability of the samples was evaluated by various methods consisting of weight loss, FTIR-ATR analysis and morphology. The results revealed no considerable effect of compatibilizer on biodegradability of samples.

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Poly(Ethylene Glycol) as a Compatibilizer for Poly(Lactic Acid)/Thermoplastic Starch Blends

Cited by 88 publications

References 42 publications

Effects of coconut oil concentration as a plasticizer and Yucca schidigera extract as a surfactant in the preparation of extruded corn starch films

Effects of coconut oil concentration as a plasticizer and Yucca schidigera extract as a surfactant in the preparation of extruded corn starch films

Biobased additive plasticizing Polylactic acid (PLA)

A new approach in compatibilization of the poly(lactic acid)/thermoplastic starch (PLA/TPS) blends

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