Clay‐containing block copolymer nanocomposites with aligned morphology prepared by extrusion

Carastan, Danilo J.; Amurin, Leice G.; Craievich, A. F.; Gonçalves, Maria do Carmo; Demarquette, Nicole R.

doi:10.1002/pi.4480

Cited by 14 publications

(29 citation statements)

References 45 publications

(67 reference statements)

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“…The results corroborate the works previously reported [25,26] who studied the state of clay dispersion in triblock copolymers. Clay particle surfaces were shown to have higher interaction with the PS chains, which exhibit a mild polarity, necessary to promote the intercalation into the clay galleries, which are also slightly polar, despite the presence of the double-tailed apolar ammonium cations [38].…”

Section: Clay Nanostructuresupporting

confidence: 82%

“…Exfoliation may have occurred due to the better affinity between the maleated groups and the clay, as discussed in previous studies [26]. Figure 3 shows 1D SAXS plots obtained with the X-ray beam parallel to the z direction (perpendicular to the tape plane, as shown in Fig.…”

Section: Clay Nanostructurementioning

confidence: 99%

“…The processing conditions were 150 C (SEBS-13 and SEBS-13-MA) and 220 C (SEBS-30 and SEBS-30-MA) in the six temperature zones of the extruder and screw speed of 100 rpm. Details of the preparation technique were reported in a previous related work [26]. a. Small-angle X-ray scattering.…”

Section: Methodsmentioning

confidence: 99%

“…After the rheological tests, just after the failure, the samples were cooled down to room temperature using a compressed air jet. The cooled samples were then analyzed at different spots along the deformed samples following the procedures reported in Carastan et al [26]. The position of the different spots corresponded to different Hencky strains, as can be seen in Fig.…”

Section: Rheological Measurementsmentioning

confidence: 99%

“…In particular, the morphology of block copolymers can be controlled by subjecting them to shear or extensional flows. Moreover, the addition of nanoparticles can induce morphological changes on a block copolymer, depending on the chemical affinity between the nanoparticles and the different domains present in the copolymer [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of block copolymer nanocomposites submitted to extensional flows

Amurin¹,

Carastan²,

Demarquette³

2016

Journal of Rheology

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In this work, the effect of extensional flow on the morphology of polystyrene-b-poly(ethylene-co-butylene)-b-polystyrene (SEBS) triblock copolymers and their clay-containing nanocomposites was evaluated. Four types of SEBS copolymers with different block compositions and cylindrical morphology were chosen to understand the effects of cylinder orientation and state of clay dispersion on the evolution of morphology during extensional flow. The effect of clay concentration (ranging from 2.5 to 7.5 wt. %) was also studied. The samples were subjected to extensional flow using a Sentmanat extensional rheometer attached to a rotational rheometer at Hencky strain rates varying from 0.01 to 20 s À1 . Small angle X-ray scattering analysis was subsequently performed to evaluate the morphological changes caused by extensional flow. When preoriented block copolymers [SEBS-30% PS (polystyrene)] and their nanocomposites undergo elongation, the styrene cylinders and clay nanoparticles align themselves in the flow direction and their rheological behavior and morphological evolution are influenced by the stretching direction (longitudinal and transverse), strain rate magnitude, clay concentration, and dispersion state of the clay nanoparticles. When isotropic block copolymers (SEBS-13% PS) undergo elongation, it was observed that the PS cylinders only exhibit structural alignment in the stretching direction in the presence of clay. Block copolymer molecules can exhibit different relaxation times depending upon the volume fraction of PS domains (13% or 30%). The addition of clay, however, hinders complete relaxation, helping to promote a permanent domain alignment after flow cessation, especially in hard-to-align copolymers. V C 2016 The Society of Rheology.

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Section: Clay Nanostructuresupporting

confidence: 82%

Section: Clay Nanostructurementioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Rheological Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Morphological evolution of block copolymer nanocomposites submitted to extensional flows

Amurin¹,

Carastan²,

Demarquette³

2016

Journal of Rheology

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Structural Behavior of Cylindrical Polystyrene‐block‐Poly(ethylene‐butylene)‐block‐Polystyrene (SEBS) Triblock Copolymer Containing MWCNTs: On the Influence of Nanoparticle Surface Modification

Hasanabadi

Nazockdast

Gajewska

et al. 2017

Macro Chemistry & Physics

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In this work, the influence of carbon nanotubes (CNTs) on the self‐assembly of nanocomposite materials made of cylinder‐forming polystyrene‐block‐poly(ethylene‐butylene)‐block‐polystyrene (SEBS) is studied. CNTs are modified with polystyrene (PS) brushes by surface‐initiated atom transfer radical polymerization to facilitate both their dispersion and the orientation of neighboring PS domains of the block copolymer (BCP) along modified CNT‐PS. Dynamic rheology is utilized to probe the viscoelastic and thermal response of the nanoscopic structure of BCP nanocomposites. The results indicate that nonmodified CNTs increase the BCP microphase separation temperature because of BCP segmental confinement in the existing 3D network formed between CNTs, while the opposite holds for the samples filled with modified CNT‐PS. This is explained by severely retarded segmental motion of the matrix chains due to their preferential interactions with the PS chains of the CNT‐PS. Moreover, transient viscoelastic analysis reveals that modified CNT‐PS have a more pronounced effect on flow‐induced BCP structural orientation with much lower structural recovery rate. It is demonstrated that dynamic‐mechanical thermal analysis can provide valuable insights in understanding the role of CNT incorporation on the microstructure of BCP nanocomposite samples. Accordingly, the presence of CNT has a significant promoting effect on microstructural development, comparable to that of annealing.

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Tuning the mechanical and dielectric properties of clay‐containing thermoplastic elastomer nanocomposites

Helal

Amurin

Carastan

et al. 2018

Polymer Engineering & Sci

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In this study, the mechanical strength and the AC short term breakdown strength of polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene (SEBS) thermoplastic elastomer clay‐containing nanocomposites have been investigated as function of their morphologies. The SEBS/clay nanocomposites with tailored morphologies were prepared previously by different processing techniques. They featured different orientations of clay platelets as well as polystyrene (PS) block nanodomains, namely: isotropic, oriented, and partially oriented morphologies. In unfilled SEBS matrices, the mechanical strength was mainly tuned by the orientation of PS block nanodomains. A good correlation between the dielectric breakdown strength and the mechanical stiffness was observed overall: the higher the mechanical strength was, the higher the breakdown strength was. In the nanocomposites, the orientation of clay platelets as well as the degree of order and the characteristic sizes of the block copolymer domains were seen to affect strongly the breakdown strength behavior in addition to the mechanical strength. In particular, the partially oriented morphology achieved by film blowing extrusion exhibited the maximum increase of the breakdown strength by 25% with optimized mechanical stiffness evaluated between that of the oriented morphology as a lower limit and that of the isotropic morphology as an upper limit. POLYM. ENG. SCI., 58:E174–E181, 2018. © 2018 Society of Plastics Engineers

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Clay‐containing block copolymer nanocomposites with aligned morphology prepared by extrusion

Cited by 14 publications

References 45 publications

Morphological evolution of block copolymer nanocomposites submitted to extensional flows

Morphological evolution of block copolymer nanocomposites submitted to extensional flows

Structural Behavior of Cylindrical Polystyrene‐block‐Poly(ethylene‐butylene)‐block‐Polystyrene (SEBS) Triblock Copolymer Containing MWCNTs: On the Influence of Nanoparticle Surface Modification

Tuning the mechanical and dielectric properties of clay‐containing thermoplastic elastomer nanocomposites

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