scholarly journals Characterization of Interfacial Structure of Polymer Brushes by Neutron Reflectivity Measurement

2016 ◽  
Vol 52 (8) ◽  
pp. 249-254
Author(s):  
Motoyasu KOBAYASHI
Keyword(s):  
Polymer Brushes ◽  
Interfacial Structure ◽  
Neutron Reflectivity ◽  
Reflectivity Measurement

HRTEM simulation of interfacial structure in amorphous multilayers

1989 ◽  
Vol 47 ◽  
pp. 466-467
Author(s):  
Margaret L. Sattler ◽  
Michael A. O'Keefe
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Cross Section ◽  
High Resolution Electron Microscopy ◽  
Interfacial Structure ◽  
Multilayer Sample ◽  
Resolution Electron ◽  
Multilayered Materials ◽  
Simulated Images

Multilayered materials have been fabricated with such high perfection that individual layers having two atoms deep are possible. Characterization of the interfaces between these multilayers is achieved by high resolution electron microscopy and Figure 1a shows the cross-section of one type of multilayer. The production of such an image with atomically smooth interfaces depends upon certain factors which are not always reliable. For example, diffusion at the interface may produce complex interlayers which are important to the properties of the multilayers but which are difficult to observe. Similarly, anomalous conditions of imaging or of fabrication may occur which produce images having similar traits as the diffusion case above, e.g., imaging on a tilted/bent multilayer sample (Figure 1b) or deposition upon an unaligned substrate (Figure 1c). It is the purpose of this study to simulate the image of the perfect multilayer interface and to compare with simulated images having these anomalies.

Multi-Stimuli-Responsive Mesoporous Membranes and Effect of Molecular Architecture on Thermo- and pH-Responsive Behavior of the grafted Block Copolymer brushes

2019 ◽  
Author(s):  
Yanchun Tang ◽  
Kohzo Ito ◽  
Hideaki Yokoyama
Keyword(s):  
Polymer Brushes ◽  
Diblock Copolymers ◽  
Neutron Reflectivity ◽  
Molecular Architecture ◽  
Stimuli Responsive ◽  
Responsive Polymer ◽  
The Matrix ◽  
Stable Part ◽  
Copolymer Brushes ◽  
Mesoporous Membranes

In this study, we prepared ultrafiltration membranes with a decoupled responses of filtration property to temperature and pH. The membrane preparation method was developed based on our previous work. We utilized methanol-supercritical carbon dioxide (methanol-scCO<sub>2</sub>) selective swelling method to introduce nanopores to block copolymers containing poly(diethylene glycol) methyl ether methacrylate (PMEO<sub>2</sub>MA), poly(N,N-dimethylaminoethyl methacrylate) (PDMAEMA) and polystyrene (PS) blocks. Formation of the mesoporous barrier layer with PS being the mechanically stable part of the matrix was driven by selective swelling of the PMEO<sub>2</sub>MA-b-PDMAEMA domains. Due to the selective swelling of PMEO<sub>2</sub>MA or PDMAEMA domains to introduce pores, the interior of the pores are covered with PMEO<sub>2</sub>MA or PDMAEMA blocks after pore formation. The PMEO<sub>2</sub>MA-b-PDMAEMA polymer brushes are naturally attached on the pore walls and worked as functional gates. PMEO<sub>2</sub>MA is a non-toxic, neutral thermo-responsive polymer with LCST at 26 ᴼC. PDMAEMA is a typical weak polyelectrolyte with pK<sub>a</sub> value at 7.0-7.5 and also a thermo-responsive polymer revealed a LCST of 20-80 °C in aqueous solution. Therefore, these membranes were expected to have multi dimensions as function of the combination of temperature and pH. Moreover, to understand the detail of the temperature and pH depended conformation transitions of PMEO<sub>2</sub>MA-b-PDMAEMA brushes, those diblock copolymers were end-tethered on flat substrates and analyzed via neutron reflectivity (NR).

Estimation of Interlayer Thickness in Inorganic Particulate-Filled Polymer Composites

2011 ◽  
Vol 24 (6) ◽  
pp. 777-788 ◽  
Author(s):  
J.Z. Liang
Keyword(s):  
Polymer Composites ◽  
Volume Fraction ◽  
Particle Diameter ◽  
Interfacial Structure ◽  
Interlayer Thickness ◽  
Filled Polymer ◽  
Mechanical And Physical Properties ◽  
The Relationship ◽  
Good Agreement

The structure of the interlayer between matrix and inclusions affect directly the mechanical and physical properties of inorganic particulate-filled polymer composites. The interlayer thickness is an important parameter for characterization of the interfacial structure. The effects of the interlayer between the filler particles and matrix on the mechanical properties of polymer composites were analyzed in this article. On the basis of a simplified model of interlayer, an expression for estimating the interlayer thickness ([Formula: see text]) was proposed. In addition, the relationship between the [Formula: see text] and the particle size and its concentration was discussed. The results showed that the calculations of the [Formula: see text] and thickness/particle diameter ratio ([Formula: see text]) increased nonlinearly with an increase of the volume fraction of the inclusions. Moreover, the predictions of [Formula: see text] and the relevant data reported in literature were compared, and good agreement was found between them.

Synthesis and Characterization of Polymer Brushes on Micromechanical Cantilevers

2004 ◽  
Vol 205 (13) ◽  
pp. 1713-1720 ◽  
Author(s):  
Gina-Gabriela Bumbu ◽  
Gunnar Kircher ◽  
Markus Wolkenhauer ◽  
Rüdiger Berger ◽  
Jochen S. Gutmann
Keyword(s):  
Polymer Brushes ◽  
Synthesis And Characterization

Characterization of Polymer Brushes on Nanoparticle Surfaces

2005 ◽  
pp. 213-230
Author(s):  
Thomas A. P. Seery ◽  
Mark Jordi ◽  
Rosette Guino ◽  
Dale Huber
Keyword(s):  
Polymer Brushes

Determining the density profile of confined polymer brushes with neutron reflectivity

2004 ◽  
Vol 42 (17) ◽  
pp. 3290-3301 ◽  
Author(s):  
W. A. Hamilton ◽  
G. S. Smith ◽  
N. A. Alcantar ◽  
J. Majewski ◽  
R. G. Toomey ◽  
...  
Keyword(s):  
Density Profile ◽  
Polymer Brushes ◽  
Neutron Reflectivity ◽  
Confined Polymer

Stratification in Bidisperse Polymer Brushes from Neutron Reflectivity

1998 ◽  
Vol 31 (8) ◽  
pp. 2616-2621 ◽  
Author(s):  
Rastislav Levicky ◽  
Nagraj Koneripalli ◽  
Matthew Tirrell ◽  
Sushil K. Satija
Keyword(s):  
Polymer Brushes ◽  
Neutron Reflectivity

Exploring Lubrication Regimes at the Nanoscale: Nanotribological Characterization of Silica and Polymer Brushes in Viscous Solvents

Langmuir ◽  
2013 ◽  
Vol 29 (32) ◽  
pp. 10149-10158 ◽  
Author(s):  
Prathima C. Nalam ◽  
Shivaprakash N. Ramakrishna ◽  
Rosa M. Espinosa-Marzal ◽  
Nicholas D. Spencer
Keyword(s):  
Polymer Brushes ◽  
Lubrication Regimes ◽  
Viscous Solvents
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