Hierarchically Ordered Multi-Component Block Copolymer/Particle Nanocomposite Materials

2003 ◽  
Vol 788 ◽  
Author(s):  
M. R. Bockstaller ◽  
E. L. Thomas
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Crystal Engineering ◽  
Particle Surface ◽  
Detailed Comparison ◽  
Homogeneous Distribution ◽  
Morphological Studies ◽  
Optical And Mechanical Properties ◽  
Copolymer Particle ◽  
Copolymer Composites

ABSTRACTThis contribution reviews the structure formation processes that are observed in binary diblock copolymer/particle and ternary diblock copolymer/particle1/particle2 mixtures. The particle core size, the polymer domain spacing as well as the particle surface chemistry are shown to determine three distinct morphological types in particle/block copolymer composites, which is the preferential layer homogeneous distribution, the interfacial segregation and center alignment of the nanocrystals within one polymer domain. The different microstructural environments of the sequestered component that are implied by the respective particle distribution result in distinctively different optical properties of the composite and have important consequences for the prospects of metal nanocrystal/block copolymer composites as a platform for photonic crystal engineering. A detailed comparison between morphological studies and theoretical predictions will be presented that aims to better understand and control morphologies of structured cluster matter and its relation to the respective optical and mechanical properties of new microstructured composite materials.

scholarly journals Influence of Nanoparticles Reinforcements on Aluminium 6061 Alloys Fabricated via Novel Ultrasonic Aided Rheo-Squeeze Casting Method

2021 ◽  
Author(s):  
T. Arunkumar ◽  
Velmurugan Pavanan ◽  
Vijay Anand Murugesan ◽  
V. Mohanavel ◽  
Karthikeyan Ramachandran
Keyword(s):  
Squeeze Casting ◽  
Mechanical Performance ◽  
Thermal Studies ◽  
Homogeneous Distribution ◽  
Al Alloy ◽  
Mechanical And Thermal Properties ◽  
The Novel ◽  
Morphological Studies ◽  
Agglomeration Of Nanoparticles ◽  
Disperse Nanoparticles

Abstract This study emphasis on a novel fabrication technique to fabricate hybrid cermets using Al 6061 alloy with nano sized SiC, Al2O3 and TiO2 as reinforcements. During the fabrication process, the melted pool was ultrasonicated to disperse nanoparticles at 20 kHz for 5 min and pressure of 50 MPa was applied to eliminate voids. The influence of nanoparticles on physical, thermal and mechanical properties were evaluated by tensile, wear and thermal studies. Cermets with Al2O3 reinforcements showed higher mechanical performance compared to Al alloy. This enhancement could be related to the uniform distribution of Al2O3 with refinement in grain size of Al alloy which was observed via surface analysis. The morphological studies provided justifiable evidence of homogeneous distribution, nominal cluster along with agglomeration and cavities shrinking on the cermets. The agglomeration of nanoparticles along with SiC protected the cermet in corrosion and abrasive wear by ~ 97% and ~ 71%. The study evidenced the novel fabrication method using ultrasonic rheo-squeeze casting led to improvement in mechanical and thermal properties of the hybrid cermets. Graphical abstract

Enhancement on Stability of Nanosized Titanium Dioxide in Silicone Suspension Using Diblock Copolymer: Influence of Dispersant Structure

2013 ◽  
Vol 747 ◽  
pp. 599-602
Author(s):  
Surachet Toommee ◽  
Nisanart Traiphol
Keyword(s):  
Titanium Dioxide ◽  
Surface Area ◽  
Diblock Copolymer ◽  
High Efficiency ◽  
Particle Surface ◽  
Ethyl Acrylate ◽  
Polymer Structure ◽  
Particle Agglomeration ◽  
Nanosized Titanium Dioxide ◽  
Enhanced Adsorption

This research investigates using of poly (dimethylsiloxane-b-hydroxy ethyl acrylate) (PDMS-b-PHEA) diblock copolymer to stabilized TiO2nanoparticles in silicone fluid. The polar PHEA segment is expected to anchor on TiO2surface while the non-polar PDMS segment extends into silicone medium. To study effects of polymer structure on its stabilizing efficiency, PDMS-b-PHEA of structures 5-b-0.3, 5-b-1.1 and 8-b-1.0 are used. Results show that suspensions of particle with surface area ~40 and ~200 m2/g can be stabilized for longer than 1 and 7 hrs, respectively. The copolymer with relatively long PHEA and PDMS segments is highly effective as a dispersant. This is due to enhanced adsorption on particle surface and steric stabilization. However, in the system of 40 m2/g-TiO2, excess amounts could lead to polymer entanglement and particle agglomeration. The copolymer dispersant exhibits high efficiency for the 200 m2/g-TiO2suspension as well. In the latter system, higher concentration is required to effectively cover particle surface.

Mechanical properties of poly (ethylene terephthalate)/hydrogenated styrene-isoprene block copolymer composites.

1993 ◽  
Vol 66 (10) ◽  
pp. 741-747 ◽  
Author(s):  
Asahiro NAGATANI ◽  
Mari ISHIHARA ◽  
Masaru MORI ◽  
Jojiro OKUMURA ◽  
Koichi YAMAGUCHI
Keyword(s):  
Mechanical Properties ◽  
Block Copolymer ◽  
Ethylene Terephthalate ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Copolymer Composites

scholarly journals Block copolymer microparticles comprising inverse bicontinuous phases prepared via polymerization-induced self-assembly

2019 ◽  
Vol 10 (15) ◽  
pp. 4200-4208 ◽  
Author(s):  
Pengcheng Yang ◽  
Yin Ning ◽  
Thomas J. Neal ◽  
Elizabeth R. Jones ◽  
Bryony R. Parker ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Internal Structure ◽  
Diblock Copolymer ◽  
Self Assembly ◽  
Bicontinuous Phases

Scalable preparation of micrometer-sized diblock copolymer particles exhibiting complex internal structure is achieved by RAFT-mediated polymerization-induced self-assembly (PISA).

Phase Transitions in Thin Block Copolymer Films

MRS Bulletin ◽  
2010 ◽  
Vol 35 (6) ◽  
pp. 457-465 ◽  
Author(s):  
Edward J. Kramer
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Block Copolymer ◽  
Diblock Copolymer ◽  
Smectic Liquid Crystals ◽  
Material System ◽  
Thermal Generation ◽  
Copolymer Films ◽  
Bcc Structure ◽  
Line Defects

AbstractDavid Turnbull's experiments and theoretical insights paved the way for much of our modern understanding of phase transitions in materials. In recognition of his contributions, this lecture will concentrate on phase transitions in a material system not considered by Turnbull, thin diblock copolymer films. Well-ordered block copolymer films are attracting increasing interest as we attempt to extend photolithography to smaller dimensions. In the case of diblock copolymer spheres, an ordered monolayer is hexagonal, but the ordered bulk is body-centered cubic (bcc). There is no hexagonal plane in the bcc structure, so a phase transition must occur as n, the number of layers of spheres in the film, increases. How this phase transition occurs with nand how it can be manipulated is the subject of the first part of my presentation. In the second part of the talk, I show that monolayers of diblock copolymer spheres and cylinders undergo order-to-disorder transitions that differ greatly from those of the bulk. These ordered 2D monolayers are susceptible to phonon-generated disorder as well as to thermal generation of defects, such as dislocations, which, while they are line defects in 3D, are point defects in 2D. The results are compared to the theories of melting of 2D crystals (spheres) and of 2D smectic liquid crystals (cylinders), a comparison that will allow us to understand most, but not all, of the features of these order-disorder transitions that occur as the temperature is increased.

scholarly journals Controllable nanostructural transitions in grafted nanoparticle-block copolymer composites

Nano Research ◽  
2010 ◽  
Vol 3 (5) ◽  
pp. 356-362 ◽  
Author(s):  
Guang-Kui Xu ◽  
Xi-Qiao Feng ◽  
Shou-Wen Yu
Keyword(s):  
Block Copolymer ◽  
Grafted Nanoparticle ◽  
Copolymer Composites

Ultrahigh Loading of Nanoparticles into Ordered Block Copolymer Composites

2014 ◽  
Vol 47 (5) ◽  
pp. 1844-1849 ◽  
Author(s):  
Li Yao ◽  
Ying Lin ◽  
James J. Watkins
Keyword(s):  
Block Copolymer ◽  
Copolymer Composites

Synthesis of Self-Assembled Metal-Oxide Nanostructures in a Diblock Copolymer Matrix and Integration onto Semiconductor Surfaces

2000 ◽  
Vol 642 ◽  
Author(s):  
Robert F. Mulligan ◽  
Agis A. Iliadis ◽  
U. Lee ◽  
Peter Kofinas
Keyword(s):  
Block Copolymer ◽  
Diblock Copolymer ◽  
Photoelectron Spectroscopy ◽  
Ring Opening ◽  
Diblock Copolymers ◽  
X Ray ◽  
Oxide Nanostructures ◽  
Metal Oxide Nanostructures ◽  
Self Assembled ◽  
Zno Nanoclusters

ABSTRACTThe synthesis of self-assembled ZnO nanostructures at room temperature using a microphase separated diblock copolymer as a template is reported. Poly(norbornene) / poly(norbornene-dicarboxylic acid) diblock copolymers were synthesized using Ring Opening Metathesis Polymerization (ROMP). The polymers were dissolved and the solutions were doped with ZnCl2. Films were formed from this solution, and subsequently reacted with NH4OH. This converted the ZnCl2 into ZnO contained within the microphase-separated nanodomains of the block copolymer. Fourier Transform Infrared Spectroscopy verified the association of the metal to the second block of the polymer, and X-ray Photoelectron Spectroscopy verified the conversion of the salt to ZnO nanoclusters. The development of such ZnO - block copolymer nanocomposites is targeting the functionalization of nanostructures into device technologies.

Micelles and Vesicles Formed by Polyoxometalate-Block Copolymer Composites

2009 ◽  
Vol 48 (44) ◽  
pp. 8281-8284 ◽  
Author(s):  
Weifeng Bu ◽  
Sayaka Uchida ◽  
Noritaka Mizuno
Keyword(s):  
Block Copolymer ◽  
Copolymer Composites
Sign in / Sign up

Export Citation Format

Share Document