A5108024234- Block Copolymer Self-Assembly
- Advanced Polymer Synthesis and Characterization
- Surfactants and Colloidal Systems
- Pickering emulsions and particle stabilization
- Machine Learning in Materials Science
- Polymer Surface Interaction Studies
- Polymer crystallization and properties
- Rheology and Fluid Dynamics Studies
- Advanced Materials and Mechanics
- Enhanced Oil Recovery Techniques
- Photochromic and Fluorescence Chemistry
- Mesoporous Materials and Catalysis
- Force Microscopy Techniques and Applications
- Innovative Microfluidic and Catalytic Techniques Innovation
- Polymer Nanocomposites and Properties
- Photoreceptor and optogenetics research
- Liquid Crystal Research Advancements
- E-commerce and Technology Innovations
- Proteins in Food Systems
University of Massachusetts Amherst
2020-2025
Amherst College
2020
Amphiphilic bottlebrush block copolymers (BBCPs), having a hydrophilic polymer (BP) linked covalently to hydrophobic BP, were found segregate liquid–liquid interfaces minimize the free energy of system. The key parameter influencing outcome experiments is ratio between degree polymerization backbone (NBB) and that side-chain brushes (NSC). Specifically, spherical, star-like configuration results when NBB < NSC, while cylindrical, bottlebrush-like shape preferred > NSC. Dynamic interfacial...
Bottlebrush random copolymers (BRCPs), consisting of a distribution two homopolymer chains along backbone, can segregate to the interface between immiscible homopolymers.
The architecture of polymer chains can play a significant role in their behavior at interfaces.
Abstract The phase behavior of block copolymers (BCPs) at the water‐oil interface is influenced by segmental interaction parameter ( ) and chain architecture. We synthesized a series star (s‐BCPs) having polystyrene (PS) as core poly(2‐vinylpyridine) (P2VP) corona. parameters block‐block PS‐P2VP block‐solvent P2VP‐solvent were varied adjusting pH aqueous solution. Lowering increased fraction quaternized‐P2VP (Q‐P2VP) with enhanced hydrophilicity. By transferring equilibrated interfacial...
Star block copolymers (s-BCPs), comprised of multiple linear diblock joined at a central point, are shown to segregate the interface between two immiscible homopolymers that identical blocks s-BCPs. The s-BCPs undergo configurational transition interface, with different being embedded in their respective homopolymers, thereby bridging and promoting adhesion. A series 4-arm were synthesized hydrogenated or deuterated polystyrene (PS/dPS) as core poly(2-vinylpyridine) (P2VP) corona block,...
We used grazing-incidence small-angle neutron scattering (GISANS) to probe the depth-dependent orientation of self-assembled morphologies block copolymers. A hydrophobic–hydrophobic copolymer, poly(solketal methacrylate)-block-polystyrene (PSM-b-PS), was synthesized and spin-coated into films tens nanometers in thickness where polymers adopted a disordered state. PSM-b-PS then hydrolyzed by exposing polymer thin film trifluoroacetic acid vapor or embedding photoacid generator during spin...
Abstract The phase behavior of block copolymers (BCPs) at the water‐oil interface is influenced by segmental interaction parameter ( ) and chain architecture. We synthesized a series star (s‐BCPs) having polystyrene (PS) as core poly(2‐vinylpyridine) (P2VP) corona. parameters block‐block PS‐P2VP block‐solvent P2VP‐solvent were varied adjusting pH aqueous solution. Lowering increased fraction quaternized‐P2VP (Q‐P2VP) with enhanced hydrophilicity. By transferring equilibrated interfacial...
The self-assembly of high-χ low-N block copolymers (BCPs) can give patterns with sub-10 nm full pitch, serving as a promising alternative to photolithographic methods. In this work, we synthesized poly(solketal methacrylate)-block-polystyrene copolymers, PSM-b-PS, various volume ratios the two blocks. After hydrolysis PSM into poly(glycerol monomethacrylate), PGM, BCPs had both lamellar and cylindrical microdomain morphologies in bulk phase thin films. addition our previously developed...
In situ manipulation of the chemical composition block copolymers at fluid interfaces affords a route by which interfacial tension, packing copolymers, and penetration blocks into two liquids can be controlled. Here, series linear poly(solketal methacrylate-b-styrene) (PSM-b-PS) are used, converting hydrophobic PSM hydrophilic glycerol monomethacrylate (GM) block, that results in marked decrease liquid-liquid tension. The kinetics first-order hydrolysis reaction was analyzed monitoring...
Densely grafted bottlebrush statistical copolymers (BSCPs) and block (BBCPs) were synthesized with polystyrene (PS) poly(solketal methacrylate) (PSM) side chains to a polynorbornene backbone. The PSM could be hydrolyzed into poly(glycerol monomethacrylate) (PGM), significantly increasing the segmental interaction parameter (χ). Self-assembly of polymers was studied small-angle X-ray scattering before after hydrolysis. well-known rapid self-assembly BBCPs by thermal annealing retarded...
Photomechanical materials powered by light-induced changes in crystalline lattices offer promise for improved performance due to the high degree of coordination between shape individual molecules. While photoswitchable semicrystalline polymers present an attractive combination molecular ordering and material processability, systems developed date typically show glass transition (Tg) melting (Tm) temperatures, limiting their ability undergo rapid complete photoswitching under ambient...
Abstract We describe a fully open‐sourced Python package to process raw X‐ray scattering data using GANESHA SAXSLAB facility, and review in this manuscript the connection of theories with package. This affords researchers more flexibility analyzing visualizing reflectivity from what is now commonplace facility at many universities research laboratories engaged polymer research. briefly applications diffraction, followed by theories. A pedagogical introduction processing provided modules...
Abstract In situ manipulation of the chemical composition block copolymers at fluid interfaces affords a route by which interfacial tension, packing copolymers, and penetration blocks into two liquids can be controlled. Here, series linear poly(solketal methacrylate‐ b ‐styrene) (PSM‐ ‐PS) are used, converting hydrophobic PSM hydrophilic glycerol monomethacrylate (GM) block, that results in marked decrease liquid‐liquid tension. The kinetics first‐order hydrolysis reaction was analyzed...
Correction for ‘Polymers with advanced architectures as emulsifiers multi-functional emulsions’ by Mingqiu Hu et al. , Mater. Chem. Front. 2021, 5 1205–1220, DOI: 10.1039/D0QM00730G.