Lecture 15: Hierarchically Ordered BCP-Nanoparticle Composites
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1 Lecture 15: Hierarchically Ordered BCP-Nanoparticle Composites Polymer Based Nanocomposites Matrix: Polymers and Block Copolymers Filler: Nanoparticles 0, 1, 2D Fillers Ligands for Dispersion Co-assembly of BCP + Ex situ synthesized NP BCP Template for Control of Location and Orientation of NP Morphological Interplay and Emergent Properties
2 Nanocomposites Nanocomposites: Heterogeneous materials with at least one characteristic length scale in the nm range Polymer Nanocomposites are comprised of a polymeric material and a nanoscale material. Typically made at 1-5 vol% of nanoparticles New properties arising from: particle size and shape, particle locations and (possible) connectivity/proximity of particles Many factors affect polymer nanocomposite structure: Synthesis method (melt compounding, solvent blending, in-situ polymerization, emulsion polymerization etc). Type of nanoparticles and their surface treatments (ligand shells) Polymer matrix (Crystallinity, Molecular Weight, Polymer Chemistry, Blocks ) Nanocomposite morphology: Control of location and orientation of NP Understanding and optimizing composite properties is very challenging and important.
3 NanoComposite Opportunities Properties become size and shape dependent below some critical length scale. Dynamically tunable materials and properties. Hybrid material combinations unattainable in nature. Sophisticated tailoring of Composite Properties New materials, new properties, new phenomena Hierarchical structures; gradients, proximity effects Spatial and Orientational Ordered NP --relatively unexplored regime - lots of potential!
4 Crystalline NanoParticles Optical properties determined by quantum confinement effects, (and scattering, absorption, dielectric constant) Metal: (plasmonics) surface scattering affects electronic properties for particle size < mean free path of an electron (plasmon: coherent electron oscillation); energylevel discretization for size < 1.0 nm (metals become insulators!) The color of Gold Image from Wikimedia Commons, Variable size CdSe dots Semiconductor: band gap widens for size < exciton radius (plus high photoluminescence efficiency) Courtesy of Felice Frankel. Used with permission. Smallest QDs Bawendi et al., MIT
5 NanoWorld Surprises: Mechanical Example: Polymer Nanocomposites Objective: Clay Particle Produce easily processable, mechanically robust, higher temperature polymers via inexpensive fillers Approach: Exfoliation of Clay x t t=1 nm (0.001 μm) Polymer (thermoplastic or thermoset) Surface Functionalized mica-type layered silicate (clay) Exfoliated Nanocomposite
6 Polymer Nanocomposites Outstanding Property Enhancements Exfoliated Nylon Heat Deflection Temperature ( o C) Exfoliated Nylon Impact Strength (kj/m 2 ) Exfoliated Nylon Tensile Modulus (GPa) Exfoliated 107 Tensile Strength (MPa) Nylon 6 69 Figure by MIT OCW.
7 Characteristics of NP Composites Low vol % particle-particle correlation threshold Ultra low percolation threshold ( ~ 0.1 vol%) Particle number density up to ~ / cm 3 S/V per particle of ~ 10 7 cm 2 /cm 3 Particle size, interparticle spacing and R g of the polymer host are all comparable
8 Conventional Composites vs. NanoComposites Image removed due to copyright restrictions. Please see Fig. 1 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005):
9 Economics of Additives MMT nanoclays Carbon fibers POSS MWNT (multiwalled) SWNT (single walled) n-silica n-aluminum Oxide n-titanium Dioxide $3.5/lb $95/lb $1,000/lb-R&D $3,178/lb ($7/g)-R&D $227,000/lb ($500/g) $8.5/lb $11.8/lb $11.8/lb J Koo/R. Vaia
10 The Future - CNT the ultimate polymer? E = 1 TPa (exp and calc) σ f ~ 50 + GPa (calc) CNT Satellite Tether Image removed due to copyright restrictions. Please see the cover of Scientist Today, July/August Values for individual tubes
11 Single wall CNT fibres TEM images - note catalyst particles in left image. Courtesy Elsevier, Inc., Used with permission.
12 2D Sheet-like NPs: Sodium Montmorillonite Clay 2D Sheet-like structure (2:1) phyllosilicate 300:1 Aspect ratio Isomorphoric substituted cations Counter ions in galleries hold individual sheets together to form sheet stacks called tactoids Courtesy Andreas Trepte and Itub. Image from Wikimedia Commons, Lateral dimensions > 300 nm, Individual layer thickness ~ 1nm
13 NP-Block Polymer Materials Platform relatively BCP Host Properties: mechanical, optical, gas transport conductive, electroactive, photoactive but still limited (low index of refraction, nonmagnetic, soft, permeable ) Accessing New Properties via NP Additives 0, 1 and 2D particles (e.g. Q Dots, SWCNTs, Clays) spatial and orientational ordering of particles emergent properties from proximity effects
14 Key Attributes of NP-BCP Composites Size, shape, symmetry of both the NP and the BCP host Thermodynamic interactions (ligands and polymer) At least one NP dimension < one BCP domain length Processing conditions - applied fields Emergent properties
15 2 Approaches to NP-BCP Composites (1) In situ synthesis of NP within BCP matrix Diffusion/reaction/nucleation but restricted NP synthesis pathways since chemistry must occur inside a polymeric matrix (2) Ex situ synthesis of NP followed by blending into BCP matrix: Synthesis is done under preferrred conditions (e.g. in solution w/o oxygen, well stirred, homogeneous reactions ) Followed by Co-assembly of NP + BCP ~ (equilibrium thermodynamics)
16 Nanoparticle Block Copolymer Composites Novel Microstructured Materials With Tunable Properties Nanoparticle Strong, Stiff, High dielectric constant, Luminescent, Magnetic, Impermeable Conductive (thermal/electrical) -basically NPs provide property enhancements not available with polymers. Ex situ Synthesis & Co-assembly Block Polymer Self assembly in 1D, 2D, 3D Processing MultifunctionalPropertie Glassy, rubbery Unique properties of the Nanocomposite arise from : Small distances between components Confinement & Compartmentalization Ultra-large interfacial area per volume Stabilization of non-equilibrium phases Multifunctionality-tailoring of properties Size-dependent physics & chemistry
17 0-D Nanoparticles TEM GOLD SiO 2 Image removed due to copyright restrictions. Please see Supporting Material for Bockstaller, Michael R., et al. Size- Selective Organization of Enthalpic Compatibilized Nanocrystals in Ternary Block Copolymer/Particle Mixtures. Journal of the ACS 125 (2003): d = 3-5 nm d = 45 nm
18 Ex situ Synthesis of NP Ligands Grafting-To Grafting-From monomer S O O Br * n * SH grafting-to precise control shell grafting-from precise control core monomer + + * O n O * SH Gold NP Figure by MIT OCW. Corona - polymer ligands O O * n * SH Use thiol terminated chain to attach to gold NP surface
19 Self Organization via Co-assembly of XD-YD NP-BCP Materials Parameters Nanoparticle: size and shape: a, b, c and IPDS X = 0, 1, 2D dimensional BCP domain size and shape: A, B, C and IMDS Y = 1, 2, 3D periodic Corona: ligand chemistry, grafting density, MW of ligand BCP: composition, architecture, MW Example: 1D NP in 2D BCP Interaction parameters: χ ij Hex packed cylinders Image removed due to copyright restrictions. Please see Fig. 2 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005): nanorod
20 Morphological Interplay: Co-assembly of NP-BCP Materials Order-Order Phase Transitions: Volume fraction driven (NPs increase the effective vol fraction of the microdomains that they reside in) Shape accomodation driven e.g. NP Sheet + BCP cylinder domain -> BCP Lamellae e.g. Curved NP rods + BCP cylinders -> BCP Lamellae NP Templating of BCP: Heterogeneous nucleation of BCP domains on NP Kinetics of transformation is enhanced Orientational ordering of BCP by flow orienting NP Field Assisted Assembly: Top down <-> Bottom Up Topographic confinement: commensuration to template Flow, magnetic and electric fields
21 NP-BCP Symmetry Compatibility Map Image removed due to copyright restrictions. Please see Fig. 4 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005):
22 Compatible NP-BCP Nanocomposites 0D - 3D 1D - 2D Image removed due to copyright restrictions. Please see Fig. 6 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005): ~2D - 3D 2D - 1D
23 Chain Topology Issues Diblock Block Polymers Limited Interdigitation Triblock Image removed due to copyright restrictions. Please see Fig. 5 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005): Bridges and Loops junctions NP/Block Polymer Composites Next to NP: Loops only
24 Particle-Matrix Energetics Incorporation of NPs into the microdomains, locally deforms the chains. Chain deformation and IMDS area increase Image removed due to copyright restrictions. Please see Fig. 3 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005):
25 Location, Location, Location Target a specific domain Locate within the domain Homogeneous Interfacial A B B A Central Grafted Ligands Corona Solid C Particle
26 0D-1D NP-BCP Nanocomposites Location:Interfacial Small Au particles Gold NP Location:Center Medium size SiO 2 particles Image removed due to copyright restrictions. Please see Fig. 9 in Bockstaller, Michael M., et al. Block Copolymer Nanocomposites: Perspectives for Tailored Materials. Advanced Materials 17 (2005): Silica NP Ternary Nanocomposite Locations:Interfacial & Center (see next slide for details)
27 Ternary NP/BCP Nanocomposite (2 types of particles) Control of Particle Location PS-PEP+SiO 2 -R 2 (φ ~ 0.04)+Au-S-C 18 H 37 (φ ~ 0.04) Cross sectional TEM Image removed due to copyright restrictions. Please see Fig. 2 in Bockstaller, Michael R., et al. "Size-Selective Organization of Enthalpic Compatibilized Nanocrystals in Ternary Block Copolymer/Particle Mixtures." Journal of the ACS 125 (2003): Au SiO2 d = 3 nm d = 22 nm Located near the IMDS Located near the domain center
28 Electrical Anisotropy in Nanocomposites Ion transport is 100 times greater parallel to clay layers than when ions have to navigate around the high aspect ratio platelets Images removed due to copyright restrictions. GISAXS showing anisotropic orientation of clay platelets
29 Hybrid organic/inorganic systems Please see Scheme 7 in Simon, Peter F. W., et al. Block Copolymer-Ceramic Hybrid Materials from Organically Modified Ceramic Precursors. Chemical Materials 13 (2001): Mechanical properties can be tuned over several orders of magnitude!!! (a) The BCP is used as a structure directing agent for the inorganic precursor materials. A condensation reaction takes place leading to the formation of the inorganic material Elastic Modulus (MPa) (b) (c) (d) Temperature (C) Figure by MIT OCW.
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