Gregory Tudryn

Gregory Tudryn
Grow Plastics · Research & Development

Ph.D. Materials Science and Engineering

About

26
Publications
21,128
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1,241
Citations

Publications

Publications (26)
Article
Mycelium is a biopolymer that has the potential to be a sustainable replacement for petroleum based foams in some engineering applications. During a recent study, with the objectives to first relate the effects of growing conditions on material properties and second to develop a model to predict the bulk behavior of mycelium, it was found that a va...
Article
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Article
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This work investigates the mechanical behavior of mycelium composites reinforced with biodegradable agro-waste particles. In the composite, the mycelium acts as a supportive matrix which binds reinforcing particles within its filamentous network structure. The compressive behavior of mycelium composites is investigated using an integrated experimen...
Article
Mycelium, the root structure of fungi, grows naturally as a biodegradable filamentous material. This unique material has highly heterogeneous microstructure with pronounced spatial variability in density and exhibits strongly non-linear mechanical behavior. In this work we explore the material response in compression, under cyclic deformation, and...
Article
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We study a unique biomaterial developed from fungal mycelium, the vegetative part and the root structure of fungi. Mycelium has a filamentous network structure with mechanics largely controlled by filament elasticity and branching, and network density. We report the morphological and mechanical characterization of mycelium through an integrated exp...
Article
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Fungal based biopolymer matrix composites with lignocellulosic agricultural waste as the filler are a viable alternative for some applications of synthetic polymers. This research provides insight into the impact of the processing method and composition of agriwaste/fungal biopolymer composites on structure and mechanical properties. The impact of...
Article
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A non‐traditional approach to manufacturing biocomposite sandwich structures is introduced where all materials are naturally derived including natural fiber textile (jute, hemp and cellulose) as skin; mycelium‐bound agricultural waste as core; and a bioresin as matrix. This paper focuses 2 on issues related to three specific steps of the seven‐step...
Article
Full-text available
Linear viscoelastic (LVE) and dielectric relaxation spectroscopic (DRS) responses were examined for polyester ionomers based on polyethers and sulfonated phthalates with sodium counterions. For these ionomers, LVE shows both glassy and polymer relaxations increasingly delayed with increase of ionic content. DRS shows an α-relaxation process associa...
Article
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Poly(ethylene oxide) [PEO] ionomers are candidate materials for electrolytes in energy storage devices due to the ability of ether oxygen atoms to solvate cations. Copolyester ionomers are synthesized via condensation of sulfonated phthalates with glycol mixtures of PEO and poly(tetramethylene oxide) [PTMO] to create random copolymer ionomers with...
Article
A series of sulfonate polyester ionomers with well-defined poly(ethylene oxide) spacer lengths between phthalates and alkali metal cations as counterions are designed for improved ionic conductivity. Ion conduction in these chemically complex materials is dominated by the polymer mobility and the state of ionic aggregation. While the aggregation de...
Article
The nanoscale spreading of a cationic polymer lubricant (CPL) film consisting of polydimethylsiloxane with quaternary ammonium salt side chains on a SiO(2) surface was studied with the disjoining pressure measurements using atomic force microscopy. CPL shows a monotonic decrease in disjoining pressure as the film thickness increases from 1.3 to 4.5...
Article
Conventional sodium cations (Na+) in sulfonated polyester ionomers were replaced with ammonium-based ionic liquid counterions. Counterion dynamics were measured by dielectric spectroscopy and linear viscoelastic response via oscillatory shear. Ion exchange from sodium counterions to ionic liquid counterions such as tetramethylammonium and tetrabuty...
Article
Polyethylene oxide (PEO) has been copolymerized with polytetramethylene oxide (PTMO) using a sulfonated phthalate ionic linker between blocks. The product is a linear multiblock copolymer, which is neutralized with lithium and sodium. We used X-ray scattering to investigate the morphology from 25 C to 200 C. The results show that this copolymer exh...
Article
Poly(ethylene oxide) ionomers are candidate materials for electrolytes in energy storage devices due to the ability of ether oxygen to solvate cations. Copolyester ionomers are synthesized via condensation of sulfonated phthalates with mixtures of PEG and PTMG to make random copolymer ionomers with identical ion content. Variation of the PEG/PTMG c...
Article
A series of Li-, Na-, and Cs-neutralized polyester ionomers with well-defined poly(ethylene oxide) (PEO) spacer lengths between sulfonated phthalates have been investigated by X-ray scattering at room temperature. As the spacer lengths are increased the PEO segments crystallize, as evidenced by multiple crystal reflections that are identical to tho...
Article
Many polymer systems display low-q scattering following a power law, and ultra-small-angle X-ray scattering reveals that this behavior persists at scattering wavevectors corresponding to length scales of several microns. Amorphous homopolymers are expected to be homogeneous at these scales, so the identity of the phases required to account for such...
Article
A series of Li, Na, and Cs-neutralized sulfonated polyester ionomers with well-defined poly(ethylene glycol) (PEG) spacer lengths have been investigated by in situ X-ray scattering from 25 ^oC to 150 ^oC. At room temperature, the ``ionomer peak'' (q=1-5 nm-1) is absent in Na and Cs-neutralized ionomers, while Li-neutralized ionomers shows a peak at...
Article
Ionic clustering, water binding, and ion conductivity were studied in polymers functionalized with sulfonic acid and quaternary ammonium hydroxide groups. Small-angle x-ray scattering showed that no clustering occurred in the quaternary ammonium containing anion exchange membranes, while evidence of ionic clusters was present in both sulfonated pol...
Article
A series of Li, Na, and Cs-neutralized sulfonated polyester ionomers with well-defined PEG spacer lengths have been investigated by in situ X-ray scattering over a wide temperature range. At room temperature, no ``ionomer peak'' at q=1-5 nm-1 was observed, due to the high dielectric constant of the polymer matrix. As the length of the PEG segment i...
Article
Ultra-small-angle X-ray scattering is used to investigate a series of single-ion-conducting PEO-based polyester copolymers with varying amounts of ionic sulfonate groups covalently bound to the polymer chains. We observe a low-q scattering component found in many polymers, including the neutral version of our material, and generally attributed to i...
Article
Anionic poly(ethylene oxide)-based ionomers are candidate materials for electro-active devices due to the ability of ether oxygens to solvate conducting cations. Conventional alkali metal cations in sulfonated PEO-ionomers are exchanged to ionic liquid counterions and electrical and mechanical properties are measured. Electrode polarization in diel...
Article
Stress relaxation in the membrane electrode assemblies (MEA) in PEM fuel cells subjected to compressive loads is analyzed. This behavior is important because nonzero contact stress is required to maintain low electric resistivity in the fuel cell stack. Experimental results are used to guide the choice of the viscoelastic properties of the constitu...
Conference Paper
The structure and ionic association behavior of poly(ethylene glycol) (PEG),-based ionomers were studied as a function of PEG segment length, cation type, and temperature. A series of sulfonated polyester ionomers with well-defined PEG spacer lengths were synthesized by melt polycondensation. For the fully sulfonated ionomers neutralized by cesium...

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