Structure of Polymer Tethered Highly Grafted Nanoparticles

Goel, Vivek; Pietrasik, Joanna; Dong, Hongchen; Sharma, J. M.; Matyjaszewski, Krzysztof; Krishnamoorti, Ramanan

doi:10.1021/ma200621r

Cited by 71 publications

(84 citation statements)

References 47 publications

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“…Thermal cleavage of the tethering point restored the T g to that of the bulk, implying the suppression was due to excess free volume arising from frustrated chain packing. Packing frustration due to interstitial spaces within HNP assemblies that were pointed out by Yu and Koch [29] should have a profound impact on other collective relaxation modes, such as physical aging. Such detailed studies on HNP assemblies, crucial for long-term use assessments and processing procedures to tune order (i.e.…”

Section: Dynamics Of Hnps and Hnp Assembliesmentioning

confidence: 96%

“…2(b)]. [29] The bulk materials are solids with elastic relaxation times greater than 10 5 s, while the hair, when unattached to particles, show liquid behavior with relaxation times less than 1 s. The bulk material shows a distinct yield stress, much like colloidal crystals or ordered BCP structures. [30] As the interaction potential between adjacent HNPs would not only affect the structure but also the elastic properties, they examined the scaling of the elastic modulus with the molecular weight of the polymer (and hence the radius) and determined that the repulsive potential scales as U(r) ∝ r −12.5±2…”

Section: Structure Of Hnps and Hnp Assembliesmentioning

confidence: 99%

“…[29] The soft-colloid/star polymer model assumes that the following conditions are valid-that particle interactions are pairwise additive, and that there is either a solvent or free homopolymer (that acts as a Θ solvent) that swells the brush. Yu and Koch [31] argue that in the solvent-free limit, the interaction potentials are no longer pairwise additive, due to the constraint that polymer molecules tethered to particles would seek to fill all interstitial voids between the spheres surrounding the particles.…”

Section: Structure Of Hnps and Hnp Assembliesmentioning

confidence: 99%

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Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

et al. 2013

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Over the past three decades, the combination of inorganic-nanoparticles and organic-polymers has led to a wide variety of advanced materials, including polymer nanocomposites (PNCs). Recently, synthetic innovations for attaching polymers to nanoparticles to create "hairy nanoparticles" (HNPs) has expanded opportunities in this field. In addition to nanoparticle compatibilization for traditional particle-matrix blending, neat-HNPs afford one-component hybrids, both in composition and properties, which avoids issues of mixing that plague traditional PNCs. Continuous improvements in purity, scalability, and theoretical foundations of structure-performance relationships are critical to achieving design control of neat-HNPs necessary for future applications, ranging from optical, energy, and sensor devices to lubricants, green-bodies, and structures.

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Section: Dynamics Of Hnps and Hnp Assembliesmentioning

confidence: 96%

Section: Structure Of Hnps and Hnp Assembliesmentioning

confidence: 99%

Section: Structure Of Hnps and Hnp Assembliesmentioning

confidence: 99%

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Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

et al. 2013

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“…Goel and coworkers (Goel et al 2011) studied the structure of polymer-tethered highly grafted nanoparticles. The nanoparticles crystallized into highly ordered crystal structures (FCC) as measured by small angle X-ray scattering (Fig.…”

Section: Role Of Polymer-graft Modification On the Interaction Dynammentioning

confidence: 99%

Polymer-Tethered Nanoparticle Materials—An Emerging Platform for Multifunctional Hybrid Materials

Chakkalakal

Ramakrishnan

2015

Hybrid and Hierarchical Composite Materials

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The grafting of polymeric chains to inorganic (as well as organic) particle interfaces has become an indispensable tool to engineer the physicochemical and/ or biochemical properties of material interfaces. For example, polymer grafting is ubiquitously being used to compatibilize particles to polymer matrices to augment the properties of polymers in applications such as biomedical devices, lightweight aircraft wings, energy generation and storage, and for separation and environmental remediation to name a few. The recent emergence of surface-initiated controlled radical polymerization has further expanded the scope of polymer-grafted particulate materials, as the precise control of the structure of the polymer grafts offers new opportunities to tailor the properties of polymer-grafted particle systems. This chapter summarizes recent developments in synthesis of polymer-tethered nanoparticle interfaces that have afforded this fine control in the structure and properties of the resultant composite. Particular emphasis is given to the concept of "one-component hybrid materials"-that is the ability to synthesize multifunctional nanocomposite materials by the self-assembly of polymer-tethered particle systems. The role of polymer-graft modification on the interaction, dynamics, and assembly of particle brush materials is discussed to provide the context to showcase studies that have demonstrated the opportunity to harness the precision-engineered polymergrafted particle systems for the fabrication of innovative nanocomposite material technologies.

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“…Computational 6,7,9,12,16,[18][19][20][21][24][25][26][27]33 and experimental 3,4,10,13,14,22,[28][29][30][31]35,40 studies on nanocomposites, consisting of homopolymer-functionalized nanoparticles in a polymer matrix, have demonstrated that the chemistry and relative molecular weights of the graft and matrix polymers, grafting density, and nanoparticle size are parameters that play a critical role in dictating the spatial organization of the nanoparticles. For example, experimental studies 30,42,43 have achieved the migration of the polymer-grafted nanoparticles from one domain to another domain in the matrix by thermally changing the chemistry of the grafted homopolymers on the nanoparticle, and thus the compatibility of the grafted polymer and matrix.…”

mentioning

confidence: 99%

Polymer grafted nanoparticles: Effect of chemical and physical heterogeneity in polymer grafts on particle assembly and dispersion

Jayaraman

2013

J Polym Sci B Polym Phys

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Macroscopic properties of polymer nanocomposites depend on the microscopic composite morphology of the constituent nanoparticles and polymer matrix. One way to control the spatial arrangement of the nanoparticles in the polymer matrix is by grafting the nanoparticle surfaces with polymers that can tune the effective interparticle interactions in the polymer matrix. A fundamental understanding of how graft and matrix polymer chemistries and molecular weight, grafting density, and nanoparticle size, and chemistry affect interparticle interactions is needed to design the appropriate polymer ligands to achieve the target morphology. Theory and simulations have proven to be useful tools in this regard due to their ability to link molecular level interactions to the morphology. In this feature article, we present our recent theory and simulation studies of polymer grafted nanoparticles with chemical and physical heterogeneity in grafts to calculate the effective interactions and morphology as a function of chemistry, molecular weights, grafting densities, and so forth.

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Structure of Polymer Tethered Highly Grafted Nanoparticles

Cited by 71 publications

References 47 publications

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

Hairy nanoparticle assemblies as one-component functional polymer nanocomposites: opportunities and challenges

Polymer-Tethered Nanoparticle Materials—An Emerging Platform for Multifunctional Hybrid Materials

Polymer grafted nanoparticles: Effect of chemical and physical heterogeneity in polymer grafts on particle assembly and dispersion

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