Polymer Nanocomposites with Designed Interfaces

2007 ◽  
Vol 334-335 ◽  
pp. 909-912
Author(s):  
Linda S. Schadler ◽  
Sarah L. Lewis ◽  
Jun Wei Yang ◽  
Brian C. Benicewicz
Keyword(s):  
Molecular Weight ◽  
Polymer Nanocomposites ◽  
Silica Particles ◽  
Interface Region ◽  
Curved Surfaces ◽  
Grafted Polymer ◽  
Preliminary Results ◽  
Graft Density ◽  
Composite Properties

This paper shows preliminary results for polymer nanocomposites consisting of “hairy” silica particles with grafted polystyrene in polystyrene matrices of controlled molecular weight and polydispersity. The goal of the work is to tailor the degree of wetting / interaction between the particles and polymer by controlling the graft density and molecular weight of the grafted polymer. This is providing an opportunity to study the properties of the interface region and to control the bulk composite properties. We have found that the predictions for flat brushes are qualitatively, but not quantitatively, applicable and that the highly curved surfaces of nanoparticles present several challenges for the design of nanoparticle interfaces. The talk will present more complete results in this system and provide an overview of other work in our group using tailored interfaces to control nanocomposite properties.

scholarly journals Effect of Structure of Polymers Grafted from Graphene Oxide on the Compatibility of Particles with a Silicone-Based Environment and the Stimuli-Responsive Capabilities of Their Composites

Nanomaterials ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 591 ◽  
Author(s):  
Monika Zygo ◽  
Miroslav Mrlik ◽  
Marketa Ilcikova ◽  
Martina Hrabalikova ◽  
Josef Osicka ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Graphene Oxide ◽  
Radical Polymerization ◽  
Polymer Brushes ◽  
Silicone Oil ◽  
Polymer Chains ◽  
Butyl Methacrylate ◽  
Raman Shift ◽  
Stimuli Responsive ◽  
Grafted Polymer

This study reports the utilization of controlled radical polymerization as a tool for controlling the stimuli-responsive capabilities of graphene oxide (GO) based hybrid systems. Various polymer brushes with controlled molecular weight and narrow molecular weight distribution were grafted from the GO surface by surface-initiated atom transfer radical polymerization (SI-ATRP). The modification of GO with poly(n-butyl methacrylate) (PBMA), poly(glycidyl methacrylate) (PGMA), poly(trimethylsilyloxyethyl methacrylate) (PHEMATMS) and poly(methyl methacrylate) (PMMA) was confirmed by thermogravimetric analysis (TGA) coupled with online Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). Various grafting densities of GO-based materials were investigated, and conductivity was elucidated using a four-point probe method. Raman shift and XPS were used to confirm the reduction of surface properties of the GO particles during SI-ATRP. The contact angle measurements indicated the changes in the compatibility of GOs with silicone oil, depending on the structure of the grafted polymer chains. The compatibility of the GOs with poly(dimethylsiloxane) was also investigated using steady shear rheology. The tunability of the electrorheological, as well as the photo-actuation capability, was investigated. It was shown that in addition to the modification of conductivity, the dipole moment of the pendant groups of the grafted polymer chains also plays an important role in the electrorheological (ER) performance. The compatibility of the particles with the polymer matrix, and thus proper particles dispersibility, is the most important factor for the photo-actuation efficiency. The plasticizing effect of the GO-polymer hybrid filler also has a crucial impact on the matrix stiffness and thus the ability to reversibly respond to the external light stimulation.

scholarly journals Precise growth of polymer brushes on silica-based nanocomposites via visible-light-regulated controlled radical polymerization

2019 ◽  
Vol 7 (11) ◽  
pp. 6173-6179 ◽  
Author(s):  
Xue Li ◽  
Sunjie Ye ◽  
Ya Huang ◽  
Jia Le Li ◽  
Tao Cai
Keyword(s):  
Physicochemical Properties ◽  
Visible Light ◽  
Radical Polymerization ◽  
Polymer Nanocomposites ◽  
Polymer Brushes ◽  
Controlled Radical Polymerization ◽  
Crucial Importance ◽  
Grafted Polymer ◽  
Precise Control

Precise control over molecular variables of grafted polymer brushes is of crucial importance for obtaining polymer nanocomposites with desirable architectures and physicochemical properties, yet it remains a significant synthetic challenge.

A novel, stable high molecular weight urokinase: Preliminary results

1987 ◽  
Vol 48 (2) ◽  
pp. 173-178
Author(s):  
Florian Grabenwoeger ◽  
Stefan Duma ◽  
Wolfgang Dock
Keyword(s):  
Molecular Weight ◽  
High Molecular Weight ◽  
Preliminary Results

Selective binding and enrichment for low-molecular weight biomarker molecules in human plasma after exposure to nanoporous silica particles

PROTEOMICS ◽  
2006 ◽  
Vol 6 (11) ◽  
pp. 3243-3250 ◽  
Author(s):  
Rosa Terracciano ◽  
Marco Gaspari ◽  
Flaviano Testa ◽  
Luigi Pasqua ◽  
Pierosandro Tagliaferri ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Human Plasma ◽  
Silica Particles ◽  
Nanoporous Silica ◽  
Low Molecular Weight ◽  
Selective Binding ◽  
Biomarker Molecules

scholarly journals Phase Behavior of Grafted Polymer Nanocomposites from Field-Based Simulations

2019 ◽  
Vol 52 (14) ◽  
pp. 5110-5121 ◽  
Author(s):  
Jason P. Koski ◽  
Nadia M. Krook ◽  
Jamie Ford ◽  
Yoshikazu Yahata ◽  
Kohji Ohno ◽  
...  
Keyword(s):  
Phase Behavior ◽  
Polymer Nanocomposites ◽  
Grafted Polymer

Gold Nanoparticle/Polymer Nanocomposites:  Dispersion of Nanoparticles as a Function of Capping Agent Molecular Weight and Grafting Density

Langmuir ◽  
2005 ◽  
Vol 21 (13) ◽  
pp. 6063-6072 ◽  
Author(s):  
Muriel K. Corbierre ◽  
Neil S. Cameron ◽  
Mark Sutton ◽  
Khalid Laaziri ◽  
R. Bruce Lennox
Keyword(s):  
Molecular Weight ◽  
Gold Nanoparticle ◽  
Polymer Nanocomposites ◽  
Capping Agent ◽  
Grafting Density ◽  
Dispersion Of Nanoparticles

scholarly journals Impact of small changes in particle surface chemistry for unentangled polymer nanocomposites

Soft Matter ◽  
2015 ◽  
Vol 11 (8) ◽  
pp. 1634-1645 ◽  
Author(s):  
Moulik Ranka ◽  
Nihal Varkey ◽  
Subramanian Ramakrishnan ◽  
Charles F. Zukoski
Keyword(s):  
Molecular Weight ◽  
Polyethylene Glycol ◽  
Surface Chemistry ◽  
Polymer Nanocomposites ◽  
Silica Particle ◽  
Particle Surface

We report microstructural and rheological consequences of altering silica particle surface chemistry when the particles are suspended in unentangled polyethylene glycol with a molecular weight of 400.

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