Controlling nanostructure and mechanical properties in triblock copolymer/monomer blends <i>via</i> reaction-induced phase transitions

Torres, Vincent M.; LaNasa, Jacob A.; Vogt, Bryan D.; Hickey, Robert J.

doi:10.1039/d0sm01661f

Cited by 10 publications

(16 citation statements)

References 40 publications

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“…PS grafting from the mid PBD block is expected to increase the number of junctions in the L morphology, enhancing the mechanical properties. Panel a adapted and panels b–d and g reproduced with permission from ref . Copyright 2021 Royal Society of Chemistry.…”

Section: In Situ Polymer Grafting From Block Copolymersmentioning

confidence: 99%

“…40 The same polymer grafting chemistry using allylic radicals is adaptable to block copolymers with different macromolecular architectures such as ABA triblock copolymers. 34 Specifically, when a prototypical thermoplastic elastomer, poly(styrene)poly(butadiene)-poly(styrene) (SBS) triblock copolymer, is blended with styrene monomer and BPO, and polymerized at 100 °C for 3 h, the initial disordered sphere morphology transitions to L (Figure 4a−c). Similar to the PS-PBD diblock copolymer example discussed above, allylic radicals are generated on the PBD-block and initiate the polymerization of styrene, forming PS grafts.…”

Section: ■ Introductionmentioning

confidence: 99%

“…The SBS/styrene blending protocol affords the opportunity to synthesize nanostructured materials in a mold, which is important for creating samples for mechanical testing (Figure 4e,f). 34 A series of molded dog bone samples were prepared at different φ SBS values and tested using uniaxial extension to determine stress−strain curves. From the stress−strain curves, Young's modulus and tensile strength were determined for each sample and are plotted in Figure 4g.…”

Section: ■ Introductionmentioning

confidence: 99%

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Controlling Polymer Material Structure during Reaction-Induced Phase Transitions

Hickey

2023

Acc. Mater. Res.

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Metrics & MoreArticle Recommendations CONSPECTUS: Living systems are composed of a select number of biopolymers and minerals yet exhibit an immense diversity in materials properties. The wide-ranging characteristics, such as enhanced mechanical properties of skin and bone or responsive optical properties derived from structural coloration, are a result of the multiscale, hierarchical structure of the materials. The fields of materials and polymer chemistry have leveraged equilibrium concepts in an effort to mimic the structure of complex materials seen in nature. However, realizing the remarkable properties in natural systems requires moving beyond an equilibrium perspective. An alternative method to create materials with multiscale structures is to approach the issue from a kinetic perspective and utilize chemical processes to drive phase transitions. This Account features an active area of research in our group, reactioninduced phase transitions (RIPT), which use chemical reactions such as polymerizations to induce structural changes in soft material systems. Depending on the type of phase transition (e.g., microphase versus macrophase separation), the resulting change in state will occur at different length scales (e.g., nm−μm), thus dictating the structure of the material. For example, the in situ formation of either a block copolymer or a homopolymer initially in a monomer mixture during polymerization will drive nanoscale or macroscale transitions, respectively. Specifically, three different examples utilizing reaction-driven phase changes will be discussed: 1) in situ polymer grafting from block copolymers, 2) multiscale polymer nanocomposites, and 3) Lewis adduct-driven phase transitions. All three areas highlight how chemical changes via polymerizations or specific chemical binding result in phase transitions that lead to nano-and multiscale changes.Harnessing kinetic chemical processes to promote and control material structure, as opposed to organizing presynthesized molecules, polymers, or nanoparticles within a thermodynamic framework, is a growing area of interest. Trapping nonequilibrium states in polymer materials has been primarily focused from a polymer chain conformation viewpoint, in which synthesized polymers are subjected to different thermal and processing conditions. The impact of reaction kinetics and polymerization rate on final polymer material structure is starting to be recognized as a new way to access different morphologies not available through thermodynamic means. Furthermore, kinetic control of polymer material structure is not specific to polymerizations and encompasses any chemical reaction that induces morphology transitions. Kinetically driven processes to dictate material structure directly impact a broad range of areas, including separation membranes, biomolecular condensates, cell mobility, and the selfassembly of polymers and colloids. Advancing polymer material syntheses using kinetic principles such as RIPT opens new possibilities for dictating material structure and pro...

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Section: In Situ Polymer Grafting From Block Copolymersmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Controlling Polymer Material Structure during Reaction-Induced Phase Transitions

Hickey

2023

Acc. Mater. Res.

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“…This controls the morphology and volume fraction of the rigid microdomain blocks, ϕ m, of the physically crosslinked species, A. [ 285,288 ] The higher volume fraction of the rigid microdomains understandably produces elastomers with higher elastic moduli. [ 289 ] For instance, ABA triblocks composed of polystyrene (A) and polybutadiene (B) can be modulated to form both viscous polymer lubricants and robust physically crosslinked elastomeric polymer networks by varying ϕ m .…”

Section: Substrates and Structural Materials For Flexible Bioelectronicsmentioning

confidence: 99%

Recent Progress in Materials Chemistry to Advance Flexible Bioelectronics in Medicine

et al. 2022

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Designing bioelectronic devices that seamlessly integrate with the human body is a technological pursuit of great importance. Bioelectronic medical devices that reliably and chronically interface with the body can advance neuroscience, health monitoring, diagnostics, and therapeutics. Recent major efforts focus on investigating strategies to fabricate flexible, stretchable, and soft electronic devices, and advances in materials chemistry have emerged as fundamental to the creation of the next generation of bioelectronics. This review summarizes contemporary advances and forthcoming technical challenges related to three principal components of bioelectronic devices: i) substrates and structural materials, ii) barrier and encapsulation materials, and iii) conductive materials. Through notable illustrations from the literature, integration and device fabrication strategies and associated challenges for each material class are highlighted.

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“…In comparison to conventional TPEs, they offer low elongation at break and lower residual strain 90 . Torres and coworkers synthesized the linear‐comb‐linear architecture of SBS via reaction‐induced phase transition by systematically grafting PS units from polybutadiene midblock of SBS 91 . This increases the effective junctions per chain; morphology changes from spherical to lamellar as the styrene amount increases due to grafting (Figure 5).…”

Section: Impacts Of Architecture and Microstructurementioning

confidence: 99%

Styrenic block copolymer‐based thermoplastic elastomers in smart applications: Advances in synthesis, microstructure, and structure–property relationships—A review

Maji

Naskar

2022

J of Applied Polymer Sci

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Styrenic block copolymers (SBC) have been gaining attention as a specialty material in elastomer and composite industries over an extended period. Its unique segmental architecture, controllable mechanical strength, ease of processing, oxidative, and environmental stability enable versatile applications. SBCs with other unique features like ion‐containing blocks, vascular compatibility, and biostability are gaining popularity in several new‐age applications. The review mainly displays the new synthetic strategies for SBC having superior thermal and environmental resistance and how their morphologies get affected by the invention of different synthesis and molecular designing technologies. It elaborates prospects and future of SBCs in other innovative application fields like sensors for wearable devices, next‐generation proton exchange membranes for fuel cells, portable power sources for electric vehicles, shape memory polymers, and so forth. Its potential in biomedical applications like heart valves, urinary tract devices, coating for coronary stents, implants, and drug delivery applications has also been discussed. It also analyses structure properties relationship which affects their performance in these fields, along with a brief introduction about the history of invention.

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Controlling nanostructure and mechanical properties in triblock copolymer/monomer blends via reaction-induced phase transitions

Abstract: In situ polymer grafting from the mid-block of an ABA triblock copolymer leads to morphology transitions and enhanced mechanical properties.

Cited by 10 publications

References 40 publications

Controlling Polymer Material Structure during Reaction-Induced Phase Transitions

Controlling Polymer Material Structure during Reaction-Induced Phase Transitions

Recent Progress in Materials Chemistry to Advance Flexible Bioelectronics in Medicine

Styrenic block copolymer‐based thermoplastic elastomers in smart applications: Advances in synthesis, microstructure, and structure–property relationships—A review

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