Effect of compatibilization in situ on PA/SEBS blends

Carvalho, Anna Paula Azevedo de; Sirqueira, Alex da Silva

doi:10.1590/0104-1428.2195

Cited by 32 publications

(31 citation statements)

References 9 publications

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“…The urethane functional group in TPU is unstable and undergo dissociation at elevated temperatures resulting in the formation of alcohols and isocyanates. It has been found from previous studies that reaction of NCO and OH groups results in the formation of imides, amides esters, and others . Also, it has been validated that reaction between urea and anhydride leads to the rapid formation of imides .…”

Section: Resultsmentioning

confidence: 80%

“…From the figures, it appears that the in situ formed graft copolymers by reactive blending of TPU and SEBS‐g‐MA effectively stabilized morphology by improving the interfacial adhesion . It is anticipated that the maleic anhydride groups in SEBS‐g‐MA react with the isocyanate group in TPU and form the preferred in situ graft copolymer, SEBS‐g‐TPU . The presence of suitable graft polymer at the blend interface prevents the coalescence of particles by forming shells around the droplets and thus result in smaller‐sized dispersed domains .…”

Section: Resultsmentioning

confidence: 88%

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Augmentation of performance properties of maleated SEBS/TPU blends through reactive blending

Anagha

Naskar

2019

J of Applied Polymer Sci

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Meticulous investigation of reactive blending of maleic anhydride grafted styrene–ethylene–butylene–styrene (SEBS‐g‐MA) and thermoplastic polyurethane (TPU) is carried out to achieve systems with controllable morphology and superior mechanical properties. Two types of SEBS‐g‐MA (abbreviated as M1, M2) with different maleic anhydride content were used to separately blend with TPU. Formation of imide group from the interaction of isocyanate and maleic anhydride predicted from the plausible reaction scheme was confirmed through Fourier transform infrared spectroscopy. High tensile strength of the blends along with appreciable elongation at break was witnessed. Morphology analyses using scanning electron microscopy and atomic force microscopy exposed a vivid and homogenous droplet morphology in all the blends presumably due to in situ formation of a suitable copolymer at the interface. Differential scanning calorimetry was used to pursue the thermal characteristics of the blends. Melt‐rheological behavior of the blends was examined using a rubber process analyzer. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48727.

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Section: Resultsmentioning

confidence: 80%

Section: Resultsmentioning

confidence: 88%

Augmentation of performance properties of maleated SEBS/TPU blends through reactive blending

Anagha

Naskar

2019

J of Applied Polymer Sci

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“…In addition, the E ' value of PLA/TPSA blend films (Figure 4(Ac–e)) was higher than that of the PLA/TPSN blend film (Figure 4(Ab)), suggesting that acetylated starch could improve the stiffness of the blend films. This was related to the improved interfacial interaction between two phases, causing a better stress distribution at the interfaces, leading to an imparted greater rigidity 40 . However, PLA/TPSA3 blend film possessed the lowest E ' among PLA/TPSA blend films owing to the phase separation.…”

Section: Resultsmentioning

confidence: 99%

Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch

Noivoil

Yoksan

2020

J of Applied Polymer Sci

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The present research aims to improve the compatibility between relatively hydrophobic poly(lactic acid) (PLA) and hydrophilic thermoplastic starch (TPS) and the properties of the PLA/TPS blends by replacing TPS from native cassava starch (TPSN) with TPS from acetylated starch (TPSA). The effects of the degree of acetylation (DA) of acetylated starch, that is, 0.021, 0.031, and 0.074, on the morphological characteristics and properties of PLA/TPS blend are investigated. The melt blends of PLA and TPS with a weight proportion of PLA:TPS of 50:50 are fabricated and then blown into films. Scanning electron microscopy confirms the dispersion of TPS phase in the PLA matrix. Better dispersion and smaller size of the TPS phase are observed for the PLA/TPSA blend films with low DA of acetylated starch, resulting in improved tensile and barrier properties and increased storage modulus, thermal stability, and Tg, Tcc, and Tm of PLA. Elongation at break of the PLA/TPSA blend increases up to 57%, whereas its water vapor permeability and oxygen permeability decrease about 15%. The obtained PLA/TPSA blend films have the potential to be applied as biodegradable flexible packaging.

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“…As the concentration of the SEBS copolymer increases, the average SEBS dispersed phase particles size also increases, suggesting the occurrence of coalescence of the SEBS dispersed phase domains, which may have contributed to a reduction in the impact strength, as observed in Table . According to the literature in immiscible polymer blends, as is the case of PLA/SEBS bioblends, the proprerties are strongly influenced by the morphology . At higher dispersed phase concentrations, coalescence occurs leading to larger particles domains size .…”

Section: Resultsmentioning

confidence: 99%

PLA/SEBS Bioblends: Influence of SEBS Content and of Thermal Treatment on the Impact Strength and Morphology

Lima

Araújo

Agrawal

et al. 2019

Macromolecular Symposia

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The aim of this work is to evaluate the effect of SEBS content and of thermal treatment on the properties of poly(lactic acid)/styrene‐ethylene butylene‐styrene (PLA/SEBS) bioblends. X‐Ray Diffraction (XRD) and Differential Scanning Calorimetry (DSC) results show that the thermal treatment leads to the crystallization of PLA matrix, resulting in the increase of the impact strength. The PLA/SEBS bioblends containing 5 and 10% of SEBS show the highest impact strength before and after the thermal treatment. From the rheological measurements under dynamic‐oscillatory shear flow, it is observed that at low frequencies, PLA and PLA/SEBS bioblends containing 5 and 10% of SEBS exhibit a Newtonian behavior, whereas the bioblends containing 15 and 20% of SEBS present a shear thinning behavior. Cole‐Cole and Han plots show that PLA/SEBS bioblends are immiscible. SEM results show that the PLA/SEBS bioblends are immiscible, and that the bioblends containing 15 and 20% of SEBS present the highest SEBS dispersed phase domains size. The thermal treatment has no effect on the morphology of PLA/SEBS bioblends, but improves the impact strength.

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Effect of compatibilization in situ on PA/SEBS blends

Cited by 32 publications

References 9 publications

Augmentation of performance properties of maleated SEBS/TPU blends through reactive blending

Augmentation of performance properties of maleated SEBS/TPU blends through reactive blending

Compatibility improvement of poly(lactic acid)/thermoplastic starch blown films using acetylated starch

PLA/SEBS Bioblends: Influence of SEBS Content and of Thermal Treatment on the Impact Strength and Morphology

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