Search Results - chemicals

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Polymerization Via a Metal Centered Catalyst from Nanocellulose
High-density polyethylene composites are now able to go beyond previously realized storage moduli at 6-7% v/v loading using cellulose nanocrystals (CNC)s as the filler material. Using a custom catalyst, polymerization is carried out directly from the surfaces of the CNCs in a heterogeneous (slurry) fashion. Mechanical testing showed that this...
Published: 3/29/2018   |   Inventor(s): Earl Foster, Keith Hendren, Paul Deck, Travis Baughman
Category(s): Process/Procedures, Chemicals, Engineering
Cyclic gamma-Amino Acids and Peptoid Foldamers
Isonipecotic acid provides a stable scaffold with the potential for useful functionalization. Changing the side chains at the β- or γ-positions in the piperidyl ring will tune a peptide towards its biological target or catalytic function. Modifications at these positions is expected to have little effect on the chair conformation adopted...
Published: 6/13/2017   |   Inventor(s): Jatinder Josan, Robert Grams
Category(s): Medical, Biomedical, Biology, Biotechnology, Chemicals, Drug Delivery, Drug Discovery
Large Area - High Resolution Additive Manufacturing of Thin Patterned Membranes with Varying Thickness Using a Continuous, Recoat-less Vat Photopolymerization Technique
A fast, low cost manufacturing process/machine for large scale additive manufacturing of thin films and complex contours for abrasive/adhesion linings and semi-permeable membranes .
Published: 3/31/2017   |   Inventor(s): Viswanath Meenakshisundaram, Christopher Williams
Category(s): Chemicals
Gel for Ion Conduction Applications with Mechanical Strength
As key components of many energy storage and conversion technologies, polymer electrolyte materials allow for selective ion transport in diverse applications such as fuel cell membranes, battery separators, electro-responsive actuators, reverse-osmosis water purifiers, and solar cells. For electrochemical devices, solid-state polymer electrolyte ma...
Published: 2/20/2017   |   Inventor(s): Louis Madsen, Ying Wang
Category(s): Chemicals, Computer Hardware, Consumer Products, Devices, Electrical, Energy, Engineering, Materials
Porous Carbon Fiber from Block Copolymers
Carbon fiber is an important low-density material that has outstanding mechanical strength, electric conductivity, fire resistance, high chemical resistance, high operational temperature tolerance, low coefficient of thermal expansion, and excellent electromagnetic interference shielding properties. Porous carbon fibers that span the pore size acro...
Published: 1/31/2017   |   Inventor(s): Guoliang Liu, Zhengping Zhou
Category(s): Chemicals, Materials, Engineering, Energy, Electrical
Foams from (Ethylene Copolymers with) Inorganic Physical Blowing Agents with Improved Properties
The invention is directed to foamable compositions and foaming of ethylene-based copolymers containing carbon monoxide as a co-monomer with inorganic physical blowing agents with improved foaming features compared to ethylene copolymers that do not contain carbon monoxide.
Published: 1/11/2017   |   Inventor(s): Erdogan Kiran, David Dean, John Bishop
Category(s): Chemicals, Engineering
Binderless Jetting -- Using Nanoparticles to Replace Polymer Binders in Binder Jetting of Metal
In Binder Jetting of metals, polymer binding is selectively jetted onto a powder bed of metal to form a green part. Following printing, the green part undergoes a sintering post-process wherein the polymeric binder is pyrolized and the metallic particles sinter together. The use of polymer binders limits the printing process as they (i) burn off be...
Published: 9/26/2016   |   Inventor(s): Yun Bai, Christopher Williams
Category(s): Chemicals
Controlled Photoredox Ring-Opening Polymerization
Poly(a-hydroxy acids) (PAHAs), including polylactide (PLA), are important polymers that have been widely used in applications ranging from biomedical devices to packaging materials. We develop an unprecedented methodology to prepare high molecular weight PAHAs with side chain functionality.
Published: 9/23/2016   |   Inventor(s): Rong Tong, Quanyou Feng
Category(s): Chemicals
Piperazine-containing Dilithium Anionic Initiators for Isoprene Polymerization
A novel process that uses piperazine-containing dilithium anionic initiators has been developed at Virginia Tech. This process has yielded unprecedented polymerization of isoprene and polystyrenic block copolymers with improved specificity and repeatability. Resulting products could include any number of low-VOC adhesive and coatings.
Published: 8/19/2016   |   Inventor(s): Alison Schultz, Sachin Bobade, Timothy Long
Category(s): Chemicals, Process/Procedures, Consumer Products, Materials, Engineering
3D Printing All-Aromatic, High Performance Polyimides and Polybenzoxazoles Using Stereolithography (SLA): Processing the Unprocessable
All-aromatic polymers such as polyimides represent a class of polymers with exceptional thermal and thermo-mechanical properties. The semi-crystalline, rigid-rod, all-aromatic high-performance polyimide based on pyromellitic dianhydride (PMDA) and 4,4'-oxydianiline (ODA) (commonly known as Kapton) is thermally stable up to 500C and has a Tg at ~400...
Published: 8/10/2016   |   Inventor(s): Maruti Hegde, Timothy Long, Viswanath Meenakshisundaram, Christopher Williams, Nicholas Chartrain
Category(s): Chemicals
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