Effect of Polymer-Graft Modification on the Order Formation in Particle Assembly Structures

Choi, Jihoon; Hui, Chin Ming; Schmitt, Michael; Pietrasik, Joanna; Margel, Shlomo; Matyjazsewski, Krzysztof; Bockstaller, Michael R.

doi:10.1021/la4004406

Cited by 98 publications

(112 citation statements)

References 27 publications

(62 reference statements)

Supporting

Mentioning

107

Contrasting

Order By: Relevance

“…The reported N c values correspond to the transition pint between the two regimes. For more details on the experimental procedure (as well as data) the reader is referred to reference …”

Section: Resultsmentioning

confidence: 99%

Thermal Properties of Particle Brush Materials: Effect of Polymer Graft Architecture on the Glass Transition Temperature in Polymer‐Grafted Colloidal Systems

Dang

Hui

Ferebee

et al. 2013

Macromolecular Symposia

Self Cite

View full text Add to dashboard Cite

Summary:The governing parameters controlling the glass transition temperature of polymer-grafted particle systems are analyzed for the particular case of polystyrene (PS)-grafted silica colloids in the dense grafting limit. At a given degree of polymerization of surface-grafted chains the glass transition temperature is found to increase as compared to linear chain polymers of equivalent degree of polymerization. The difference in the glass transition temperature between polymer-grafted particle systems and their respective linear polymer analogs increases with decreasing degree of polymerization of surface-grafted chains and levels off at similar plateau values for particle brushes of distinct particle core size. The trend toward increased glass transition temperature is interpreted as a consequence of the increased steric hindrance in polymer-grafted particles that counteracts the relaxation of surface-grafted polymer chains. The increase in glass transition temperature is shown to be approximately consistent with the chain conformational regimes that are predicted on the basis of a Daoud-Cotton type scaling model.

show abstract

“…The reported N c values correspond to the transition pint between the two regimes. For more details on the experimental procedure (as well as data) the reader is referred to reference …”

Section: Resultsmentioning

confidence: 99%

Thermal Properties of Particle Brush Materials: Effect of Polymer Graft Architecture on the Glass Transition Temperature in Polymer‐Grafted Colloidal Systems

Dang

Hui

Ferebee

et al. 2013

Macromolecular Symposia

Self Cite

View full text Add to dashboard Cite

show abstract

“…Hairy NPs were synthesized via a grafting from the SiO 2 surface providing aHNP systems with varying graft density and polymer molecular weight (Table ). The silica particles were obtained from Nissan and are ∼16 nm (polydispersity of 35%).…”

Section: Methodsmentioning

confidence: 99%

Physical aging and glass transition of hairy nanoparticle assemblies

Koerner

Opsitnick

Grabowski

et al. 2015

J Polym Sci B Polym Phys

Self Cite

View full text Add to dashboard Cite

Matrix free assemblies of polymer‐grafted, “hairy” nanoparticles (aHNP) exhibit novel morphology, dielectric, and mechanical properties, as well as providing means to overcome dispersion challenges ubiquitous to conventional polymer‐inorganic nanocomposite blends. Physical aging of the amorphous polymer glass between the close‐packed nanoparticles (NPs) will dominate long‐term stability; however, the energetics of volume recovery within the aHNPs is unknown. Herein, we compare glass transition temperature (Tg) and enthalpy recovery of aHNPs to NP‐polymer blends, across different nano‐silica loadings (0–50 v/v%) and canopy architecture of polystyrene (PS) grafted silica. For aHNPs, the grafting of PS to silica imposes an additional design constraint between silica volume fraction, graft density, and graft molecular weight. At low and intermediate silica volume fraction, the Tg of blended nanocomposites is independent of silica content, reflecting a neutral polymer‐NP interface. For aHNPs, the Tg decreases with silica content, implying that chain tethering decreases local segment density more than the effect of molecular weight or polymer‐NP interactions. Additionally, the Tg of the aHNPs is higher than a linear matrix of comparable molecular weight, implying a complementary effect to local segment density that constrains cooperativity. In contrast, enthalpy recovery rate in the blend or aHNP glass is retarded comparably. In addition, a cross‐over temperature, Tx, emerges deep within the glass where the enthalpy recovery process of all nanocomposites becomes similar to linear unfilled matrices. Differences between structural recovery in aHNP and blended nanocomposites occur only at the highest silica loadings (∼ 50 v/v%), where enthalpy recovery for aHNPs is substantially suppressed relative to the blended counterparts. The absence of physical aging at these loadings is independent of brush architecture (graft density or molecular weight of tethered chains) and indicates that the impact of chain tethering on effective bulk structural relaxation starts to appear at particle‐particle surface separations on the order of the Kuhn length. Overall, these observations can be understood within the context of how three separate structural characteristics impact local segment density and relaxation processes: the dimension and architecture of the tethered polymer chains, the separation between NP surfaces, and the confinement imposed by chain tethering and space filling within the aHNP. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 319–330

show abstract

“…The latter is an important prerequisite to understand the role of polymer-graft modification on the interaction and structure formation characteristics of particle brushes in solid film assemblies. Choi et al (2010Choi et al ( , 2013 synthesized and characterized a number of polymergrafted nanoparticles (silica coated with polystyrene and poly methyl methacrylate) using the criteria given by Ohno et al It was found that the ability of these particles to form long-range ordered structures depended sensitively on the polymer brush architecture. In the limit of high grafting density and stretched chain conformations, particle array structures, which resembled close-packed hard-sphere arrays, were observed.…”

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Effect of Polymer-Graft Modification on the Order Formation in Particle Assembly Structures

Cited by 98 publications

References 27 publications

Thermal Properties of Particle Brush Materials: Effect of Polymer Graft Architecture on the Glass Transition Temperature in Polymer‐Grafted Colloidal Systems

Thermal Properties of Particle Brush Materials: Effect of Polymer Graft Architecture on the Glass Transition Temperature in Polymer‐Grafted Colloidal Systems

Physical aging and glass transition of hairy nanoparticle assemblies

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

Contact Info

Product

Resources

About