Star Block-Copolymers in Shear Flow

Jaramillo-Cano, Diego; Formanek, Maud; Likos, Christos N.; Camargo, Manuél

doi:10.1021/acs.jpcb.7b12229

Cited by 16 publications

(30 citation statements)

References 33 publications

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“…28 We have characterized the dependence of several observables of interest measuring the size, orientation and intrinsic viscosity, on the applied shear rate. The obtained power-laws have characteristic exponents that are clearly different from those found in other architectures (linear chains, rings, stars, dendrimers [28][29][30][31][32][33][34][35][36][37][38] ). Thus, SCNPs constitute a novel class of macromolecules with distinct response to shear.…”

Section: Introductioncontrasting

confidence: 68%

Single-Chain Nanoparticles under Homogeneous Shear Flow

Formanek

Moreno

2019

Macromolecules

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Single-chain nanoparticles (SCNPs) are ultrasoft objects obtained through purely intramolecular cross-linking of single polymer chains. By means of computer simulations with implemented hydrodynamic interactions, we investigate for the first time the effect of the shear flow on the structural and dynamic properties of SCNPs in semidilute solutions. We characterize the dependence of several conformational and dynamic observables on the shear rate and the concentration, obtaining a set of power-law scaling laws. The concentration has a very different effect on the shear rate dependence of the former observables in SCNPs than in simple linear chains. Whereas for the latter the scaling behavior is marginally dependent on the concentration, two clearly different scaling regimes are found for the SCNPs below and above the overlap concentration.At fixed shear rate SCNPs and linear chains also respond very differently to crowding.Whereas, at moderate and high Weissenberg numbers the linear chains swell, the SC-NPs exhibit a complex non-monotonic behavior. These findings are inherently related to the topological interactions preventing concatenation of the SCNP loops, leading to less interpenetration than for linear chains.

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Section: Introductioncontrasting

confidence: 68%

Single-Chain Nanoparticles under Homogeneous Shear Flow

Formanek

Moreno

2019

Macromolecules

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“…On the other opposite limit, at high α and λ (α 0.6 and λ 1.1), the macromolecule acquires cylindrical symmetry around its principal axis, since it self-assembles into dumbbell-like structures with one or two massive patches (Case 3). At intermediate values of α and λ, the SBCs form a number of patches that can break-up and/or merge as a consequence of shear (Case 2) [9][10][11]. These three tendencies can be also observed from the dynamical point of view, as displayed in Fig.…”

Section: Rotationalmentioning

confidence: 81%

“…We focus on the following three particular sets of parameters: { f , α, λ} = {12, 0.3, 1.0} (Case 1), {15, 0.5, 1.1} (Case 2) and {18, 0.7, 1.1} (Case 3). According to our previous study, these parameters represent the typical trends found in regard to the patchiness of the SBCs, namely, no patches are formed, several patches are formed having a small population, and few (one or two) bulky patches are formed [11]. For each run, a preparation cycle of 5 × 10 6 MD steps was executed in first place, which was long enough for the SBC to reach its stationary state and then, a production cycle of 1.5 × 10 7 MD steps took place.…”

Section: Multiparticle Collision Dynamics (Mpcd) and Molecular Dynamimentioning

confidence: 88%

“…The dynamics of the case 2 is richer; although this system features four patches in average [11], the shear causes those patches to break and to cluster over and over again. Therefore, here the rotational frequency results from the average of the tank-treading motion of free and clustered arms.…”

Section: Discussionmentioning

confidence: 99%

“…In particular, the formation of attractive patches on the SBC corona 2 of 20 as a function of the shear rate was analysed. Three mechanisms of patch reorganization under shear were identified, which determine the dependence of the patch numbers and orientations on the shear rate, namely, free arms joining existing patches, fusion of medium-sized patches into bigger ones, and fission of large patches into two smaller ones at high shear rates [11].…”

Section: Introductionmentioning

confidence: 99%

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Rotation Dynamics of Star Block Copolymers under Shear Flow

Jaramillo-Cano

Likos

Camargo

2018

Preprint

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Star block-copolymers (SBCs) are macromolecules formed by a number of diblock copolymers anchored to a common central core, being the internal monomers solvophilic and the end monomers solvophobic. Recent studies have demonstrated that SBCs constitute a self-assembling building blocks with specific softness, functionalization, shape, and flexibility. Depending on different physical and chemical parameters the SBCs can behave as flexible patchy particles. In this paper, we study the rotational dynamics of isolated SBCs using a hybrid mesoscale simulation technique. We compare three different approaches to analyse the dynamics: the laboratory frame, the non-inertial Eckart's frame, and a geometrical approximation relating the conformation of the SBC to the velocity profile of the solvent. We find that the geometrical approach is adequate when dealing with very soft systems while in the opposite extreme, the dynamics is best explained using the laboratory frame. On the other hand, the Eckart frame is found to be very general and to reproduced well both extreme cases. We also compare the rotational frequency and the kinetic energy with the definitions of the angular momentum and inertia tensor different from recent publications.

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Recent advances on the structure–properties relationship of multiblock copolymers

Baeza

2021

Journal of Polymer Science

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Multiblock copolymers represent a fascinating class of materials that sits at the very heart of industrial applications and fundamental polymer science. They are most often made of a linear succession of incompatible “soft” and “hard” segments that microphase separate at room temperature while they can be easily re‐homogenized upon heating. This thermoreversible character provides them with decisive advantages with respect to other rubber‐based materials such as vulcanized elastomers, making them indispensable for the development of a more sustainable polymer industry. Beyond practical opportunities, tailoring the multiblock copolymers morphology has a pivotal role to play in the fundamental understanding of the structure–properties relationship of polymer‐based systems. It notably serves to comprehend complex materials such as semicrystalline homopolymers and nanocomposites. Aside from the thorough work developed on well‐defined diblock copolymers for half a century, this article review aims to guide the reader into the more intricate world of multiblock copolymers by providing him/her quantitative tools to connect chemical nature, microstructure and mechanical properties.

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Star Block-Copolymers in Shear Flow

Cited by 16 publications

References 33 publications

Single-Chain Nanoparticles under Homogeneous Shear Flow

Single-Chain Nanoparticles under Homogeneous Shear Flow

Rotation Dynamics of Star Block Copolymers under Shear Flow

Recent advances on the structure–properties relationship of multiblock copolymers

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