Effect of different thermal treatments on the self-assembled nanostructures of a styrene–butadiene–styrene star block copolymer

Serrano, Elena; Zubeldia, Amaia; Larrañaga, Maider; Remiro, P. M.; Mondragón, Iñaki

doi:10.1016/j.polymdegradstab.2003.08.009

Cited by 24 publications

(20 citation statements)

References 32 publications

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“…As can be seen in Figure 6a, the original SB star block copolymer self-assembles into a lamellar nanostructure, where the lamellae are oriented perpendicular to the free surface with an interlamellar period of 35 nm. [16] Similar assignments have been made in the literature. [17] Moreover, according to AFM working at moderate tapping conditions, the darker segments belong to the styrene blocks while the brighter ones belong to the butadiene or epoxidized butadiene blocks.…”

Section: Synthesis and Characterization Of Neat Epoxidized Sb Copolymerssupporting

confidence: 73%

“…[17] Moreover, according to AFM working at moderate tapping conditions, the darker segments belong to the styrene blocks while the brighter ones belong to the butadiene or epoxidized butadiene blocks. [16,[18][19][20] For the 5 mol-% epoxidized copolymer (Figure 6b), the poly(epoxidized butadiene-co-butadiene) lamellae are interconnected forming short domains, some of them with a spherical form. These interconnections increase with the degree of epoxidation leading to what seems to be a transition between lamellar and hexagonal morphology for the 29 mol-% epoxidized copolymer (Figure 6c).…”

Section: Synthesis and Characterization Of Neat Epoxidized Sb Copolymersmentioning

confidence: 99%

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Synthesis and Characterization of Epoxidized Styrene‐Butadiene Block Copolymers as Templates for Nanostructured Thermosets

Serrano

Larrañaga

Remiro

et al. 2004

Macro Chemistry & Physics

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Summary: A wide range of epoxidized styrene‐block‐butadiene block copolymers were synthesized using hydrogen peroxide in the presence of an in situ prepared methyltrioctylammoniumtetrakis(diperoxotungstate)phosphate as the catalyst system in a water/dichloroethane biphasic system. 1H NMR and FT‐IR spectra revealed that the epoxidation procedure led mainly to 1,4‐epoxidized butadiene units. GPC analysis showed that epoxidation changed the copolymer architecture into stars with fewer arms. The copolymers showed two glass transition temperatures in accordance with the phase separation for block copolymers and, as revealed in AFM images, the self‐assembly takes place on a nanometer scale. Moreover, epoxidized styrene‐butadiene (SB) copolymers showed improved miscibility with epoxy monomers leading to self‐assembled nanostructures in the uncured state. This allows them to be used as templates for nanostructured resins.TM‐AFM phase images for: a) 40 mol‐% epoxidized copolymer (scale bar = 300 nm); b) uncured blend containing 50 wt.‐% DGEBA in 50 mol‐% epoxidized copolymer (scale bar = 1 μm), after annealing at 80 °C in vacuum for 3 h.imageTM‐AFM phase images for: a) 40 mol‐% epoxidized copolymer (scale bar = 300 nm); b) uncured blend containing 50 wt.‐% DGEBA in 50 mol‐% epoxidized copolymer (scale bar = 1 μm), after annealing at 80 °C in vacuum for 3 h.

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Section: Synthesis and Characterization Of Neat Epoxidized Sb Copolymerssupporting

confidence: 73%

Section: Synthesis and Characterization Of Neat Epoxidized Sb Copolymersmentioning

confidence: 99%

Synthesis and Characterization of Epoxidized Styrene‐Butadiene Block Copolymers as Templates for Nanostructured Thermosets

Serrano

Larrañaga

Remiro

et al. 2004

Macro Chemistry & Physics

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“…The first equilibrium morphologies confirmed for diblock (AB) and triblock (ABA) copolymers were lamellae, spheres or cylinders arranged on a body-centred cubic or hexagonal packed lattice [15,16]. These structures depend primarily on molecular composition/architecture, thermodynamic incompatibility of the block and monomer asymmetry.…”

Section: Introductionmentioning

confidence: 99%

Morphological analysis of self-assembled SIS block copolymer matrices containing silver nanoparticles

Peponi

Tercjak

Torre

et al. 2008

Composites Science and Technology

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“…This copoly mer was synthesized by anionic polymerization, using alkyl litio as initiator and a coupling agent to get star structure. It has a number–average molecular weight ( M n ) of 183,000 refered to PS and a polydispersity index 1.34 (as measured by gel permeation chromatography) 37. According to quantitative 1 H NMR (Bruker 500 MHz) spectral analyses, the SBS block copolymer contained 58.5 wt % PS, 37.6 wt % 1,4‐polybutadiene and 3.9 wt % 1,2‐polybutadiene 37.…”

Section: Methodsmentioning

confidence: 99%

“…It has a number–average molecular weight ( M n ) of 183,000 refered to PS and a polydispersity index 1.34 (as measured by gel permeation chromatography) 37. According to quantitative 1 H NMR (Bruker 500 MHz) spectral analyses, the SBS block copolymer contained 58.5 wt % PS, 37.6 wt % 1,4‐polybutadiene and 3.9 wt % 1,2‐polybutadiene 37. Besides, Irganox antioxidant was used in 1 wt % with respect to copolymer to prevent degradation during thermal processing.…”

Section: Methodsmentioning

confidence: 99%

Structural and ordering behavior of lamellar polystyrene‐block‐polybutadiene‐block‐polystyrene triblock copolymer containing layered silicates

Vázquez

López

Serrano

et al. 2008

J of Applied Polymer Sci

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Nanocomposites based on organically modified montmorillonites (OMMTs) and sodium montmorillonite (CLO-Na þ ) with poly(styrene-b-butadiene-bstyrene) (SBS) diblock copolymer have been investigated. Solution blending of OMMT suspension in toluene with SBS and subsequent static casting and annealing resulted in transparent films. Final samples were processed by compression molding. The intercalation spacing in the nanocomposites, microphase separation of the SBS, and the degree of dispersion of nanocomposites were investigated by X-ray diffraction (Wide and small-angle X-ray scattering), transmission optical microscopy (TOM), atomic force microscopy (AFM), and transmission electron microscopy (TEM). The increase of basal spacing of OMMT in the nanocomposites suggested the intercalation of SBS.The lamellar structure perfection was extensively affected by both OMMT. AFM images and TOM micrographs only showed well dispersed but not exfoliated nanocomposites. On the other hand, TEM showed inserted tactoids into both blocks depending on the surfactant used (stained samples) and the dispersion of those tactoids (unstained samples). Fourier transform infrared spectroscopy indicated only the presence of the OMMT into the SBS. Deviations of the decomposition pathway of pristine SBS with addition of the OMMT were found by thermogravimetric analysis.

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Effect of different thermal treatments on the self-assembled nanostructures of a styrene–butadiene–styrene star block copolymer

Cited by 24 publications

References 32 publications

Synthesis and Characterization of Epoxidized Styrene‐Butadiene Block Copolymers as Templates for Nanostructured Thermosets

Synthesis and Characterization of Epoxidized Styrene‐Butadiene Block Copolymers as Templates for Nanostructured Thermosets

Morphological analysis of self-assembled SIS block copolymer matrices containing silver nanoparticles

Structural and ordering behavior of lamellar polystyrene‐block‐polybutadiene‐block‐polystyrene triblock copolymer containing layered silicates

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