Poly[acrylic acid-b-styrene-b-isobutylene-b-styrene-b-acrylic acid] pentablock terpolymers: 1. Morphological characterization

Kopchick, James G.; Storey, Robson F.; Beyer, Frederick L.; Mauritz, Kenneth A.

doi:10.1016/j.polymer.2007.04.048

Cited by 14 publications

(19 citation statements)

References 14 publications

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“…This image also suggests that the circular domains could correspond to the top view of a spherical morphology . This morphology is characteristic of PS when it is embedded in an elastomeric matrix such as poly(acrylic acid‐ b ‐styrene‐ b ‐isobutylene‐ b ‐styrene‐ b ‐acrylic acid) pentablock copolymer (PAA), as Kopchick et al . have previously reported.…”

Section: Resultssupporting

confidence: 62%

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Rozo‐Medina

Padovani

2017

J of Applied Polymer Sci

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Sulfonated, block copolymers have traditionally been studied for applications in fuel cells and chemical protective clothing, among others. As such, most investigations have focused on the evaluation of transport properties and the selectivity and permeability of the polymer membranes. This work, however, focuses on the electrical characterization of sulfonated poly(styreneisobutylene-styrene) (SIBS) triblock copolymer thin films. More specifically, the dielectric properties of SIBS are evaluated as a function of critical parameters such as frequency, sulfonation percent, and the polymer concentration. The results show that the dielectric constant increases with sulfonation percent and polymer concentration to values as high as 13,600. This work also provides insights into the correlation of SIBS electrical properties with its chemical structure and morphology. The structure-property relationship is derived through a combination of techniques including: elemental analysis, Fourier transform infrared spectroscopy, thermogravimetric analysis, and atomic force microscopy.

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Section: Resultssupporting

confidence: 62%

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Rozo‐Medina

Padovani

2017

J of Applied Polymer Sci

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“…However, most investigations of ABCBA pentablock terpolymers were focused on the synthesis methods, micellization in solutions, and stimuli-sensitive behaviors in solvent. − ,− Only a few studies have reported experimentally and theoretically on the phase behaviors of ABCBA pentablock terpolymers in bulk. Kopchick et al have reported that poly(acrylic acid- b -styrene- b -isobutylene- b -styrene- b -acrylic acid) pentablock terpolymers formed three-phase morphologies with a considerable order. Mahanthappa et al , have observed the lamellae phases for poly(cyclohexylethylene- b -(ethylene- alt -propylene)- b -ethylene- b -(ethylene- alt -propylene)- b -cyclohexylethylene) (CPEPC) pentablock terpolymers and found that the combination of glassy C, elastomeric P, and semicrystalline E blocks could render the CPEPC pentablock terpolymers improved mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Observation of Double Gyroid and Hexagonally Perforated Lamellar Phases in ABCBA Pentablock Terpolymers

Gao

et al. 2020

Macromolecules

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Three symmetric linear pentablock terpolymers, poly(tert-butyl acrylate-b-styrene-b-ethylene oxide-b-styrene-b-tert-butyl acrylate) (T z S y O x S y T z ), with similar lengths of PS (S) and PtBA (T) blocks on the two sides but various lengths of the PEO (O) block in the middle, namely, T95S62O46S62T95, T105S60O90S60T105, and T107S65O136S65T107, were synthesized from their corresponding parent triblock copolymers poly(styrene-b-ethylene oxide-b-styrene) (S y O x S y ), that is, S62O46S62, S60O90S60, and S65O136S65. The phase behaviors of T z S y O x S y T z pentablock terpolymers were studied using synchrotron small-angle X-ray scattering and transmission electron microscopy. The PEO block length was found to significantly affect the phase structures of the obtained T z S y O x S y T z pentablock terpolymers. Although all three S y O x S y parent triblock copolymers were in disordered states, very interestingly, ordered structures were formed in all three T z S y O x S y T z pentablock terpolymers. Particularly, the double gyroid (Q230) network structure was experimentally observed for the first time in a symmetric linear ABCBA-type pentablock terpolymer, that is, T105S60O90S60T105. Moreover, the hexagonal perforated lamellae (HPL) structure was also observed in unsheared T107S65O136S65T107. Temperature-variable SAXS showed that T95S62O46S62T95 maintained an ordered lamellar phase structure in the temperature range of 25–210 °C, and an order-to-disorder transition occurred for T95S62O46S62T95 at around 170 °C. The HPL phase of T107S65O136S65T107 still partially remained with decreased ordering at a temperature of up to 210 °C.

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“…TPEs based on polysiobutylene (PIB) inner blocks and polystyrene (PS) outer blocks have been extensively studied with emphasis on using controlled/living polymerization techniques to achieve specific block sequences and controlled phase separation . The gas and liquid permeability of these materials can be modified through the introduction of a polar phase, such as polyacrylic acid (PAA), which provides possibilities for additional triphasic morphologies, which will, in principle, allow for the tailoring of different diffusion pathways through the system …”

Section: Introductionmentioning

confidence: 99%

Phase separation and permeability in polyisobutylene-based miktoarm star polymers

Knauer

Zhu

Storey

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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The phase behavior of (PS‐PIB)2‐s‐PAA miktoarm star terpolymers with varying volume fractions of PAA was investigated directly by transmission electron microscopy, atomic force microscopy, and small‐angle X‐ray scattering, and indirectly by thermogravimetric analysis and degree of water sorption. The microdomains of (PS‐PIB)2‐s‐PAA demonstrate a unique and unexpected progression from highly ordered cylinders, to lower ordered spheres, to gyroid structures with increasing PAA content from 6.6 to 47 wt %. Interestingly, the phase behavior in the miktoarm star polymer system is significantly different from that reported previously for the linear counterpart of similar composition (PAA‐PS‐PIB‐PS‐PAA), where a steady progression from cylindrical to lamellar morphology was observed with increasing PAA content. At low PAA concentrations, the morphology is driven primarily by the relative solubility of the components, while at high PAA content the molecular architecture dominates. Thermal annealing demonstrated the thermodynamic stability of the morphologies, indicating the potential for design of novel microstructures for specific applications through precise control of architecture, composition, and interaction parameters of the components. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 916–925

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Poly[acrylic acid-b-styrene-b-isobutylene-b-styrene-b-acrylic acid] pentablock terpolymers: 1. Morphological characterization

Cited by 14 publications

References 14 publications

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Dielectric behavior of sulfonated poly(styrene–isobutylene–styrene) triblock copolymer thin films

Observation of Double Gyroid and Hexagonally Perforated Lamellar Phases in ABCBA Pentablock Terpolymers

Phase separation and permeability in polyisobutylene-based miktoarm star polymers

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