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Phase Behavior and Self-Assembly of Perfectly Sequence-Defined and Monodisperse Multiblock Copolypeptides

MacEwan, Sarah R.; Weitzhandler, Isaac; Hoffmann, Ingo; Genzer, Jan; Gradzielski, Michael; Chilkoti, Ashutosh

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Phase Behavior and Self-Assembly of Perfectly Sequence-Defined and Monodisperse Multiblock Copolypeptides

MacEwan, Sarah R.; Weitzhandler, Isaac; Hoffmann, Ingo; Genzer, Jan; Gradzielski, Michael; Chilkoti, Ashutosh

This paper investigates how the properties of multiblock copolypeptides can be tuned by their block architecture, defined by the size and distribution of blocks along the polymer chain. These parameters were explored by the precise, genetically encoded synthesis of recombinant elastin-like polypeptides (ELPs). A family of ELPs was synthesized in…
Bulk and Surface Morphologies of ABC Miktoarm Star Terpolymers Composed of PDMS, PI, and PMMA Arms

Chernyy, Sergey; Kirkensgaard, Jacob Judas Kain; Mahalik, Jyoti P.; Kim, Hyeyoung; Arras, Matthias M. L.; Kumar, Rajeev; Sumpter, Bobby G.; Smith, Gregory S.; Mortensen, Kell; Russell, Thomas P.; Almdal, Kristoffer

 Customer publications

Bulk and Surface Morphologies of ABC Miktoarm Star Terpolymers Composed of PDMS, PI, and PMMA Arms

Chernyy, Sergey; Kirkensgaard, Jacob Judas Kain; Mahalik, Jyoti P.; Kim, Hyeyoung; Arras, Matthias M. L.; Kumar, Rajeev; Sumpter, Bobby G.; Smith, Gregory S.; Mortensen, Kell; Russell, Thomas P.; Almdal, Kristoffer

DIM miktoarm star copolymers, composed of polydimethylsiloxane , poly(1,4-isoprene) , and poly(methyl methacrylate) , were synthesized using a newly developed linking methodology with 4-allyl-1,1-diphenylethylene as a linking agent. The equilibrium bulk morphologies of the DIM stars were found to range from tiling patterns to alternating lamellar and alternating cylindrical…
Understanding Thermal Insulation in Porous, Particulate Materials

Ruckdeschel, Pia; Philipp, Alexandra; Retsch, Markus

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Understanding Thermal Insulation in Porous, Particulate Materials

Ruckdeschel, Pia; Philipp, Alexandra; Retsch, Markus

Silica hollow nanosphere colloidal crystals feature a uniquely well-defined structure across multiple length scales. This contribution elucidates the intricate interplay between structure and atmosphere on the effective thermal diffusivity as well as the effective thermal conductivity. Using silica hollow sphere assemblies, one can independently alter the particle geometry, the density,…
High crystalline, porous polyamide 6 by anionic polymerization

Rahman, Md Arifur; Renna, Lawrence A.; Venkataraman, D.; Desbois, Philippe; Lesser, Alan J.

 Customer publications

High crystalline, porous polyamide 6 by anionic polymerization

Rahman, Md Arifur; Renna, Lawrence A.; Venkataraman, D.; Desbois, Philippe; Lesser, Alan J.

Polyamide 6 (PA6), also known as Nylon 6 is a widely used industrial polymer. The structural properties of PA6 play an important role in its potential commercial applications. We report that the anionic polymerization of ε-caprolactam in the presence of liquid additives such as o-Xylene, m-Xylene, p-Xylene and toluene at…
Comparative Investigation of the Thermoresponsive Behavior of Two Diblock Copolymers Comprising PNIPAM and PMDEGA Blocks

Aravopoulou, Dionysia; Kyriakos, Konstantinos; Miasnikova, Anna; Laschewsky, André; Papadakis, Christine M.; Kyritsis, Apostolos

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Comparative Investigation of the Thermoresponsive Behavior of Two Diblock Copolymers Comprising PNIPAM and PMDEGA Blocks

Aravopoulou, Dionysia; Kyriakos, Konstantinos; Miasnikova, Anna; Laschewsky, André; Papadakis, Christine M.; Kyritsis, Apostolos

The thermoresponsive behavior of two diblock copolymers PS-b-PNIPAM and PS-b-PMDEGA, which both comprise a hydrophobic polystyrene (PS) block but different thermoresponsive blocks, also differing in length, poly(N-isopropylacrylamide) (PNIPAM) and poly(methoxy diethylene glycol acrylate) (PMDEGA), respectively, was comparatively investigated in a wide temperature range. Concentrated aqueous…
Structural studies of thermally stable, combustion-resistant polymer composites

Smith, Gregory N.; Hallett, James E.; Joseph, Paul; Tretsiakova-McNally, Svetlana; Zhang, Tan; Blum, Frank D.; Eastoe, Julian

 Customer publications

Structural studies of thermally stable, combustion-resistant polymer composites

Smith, Gregory N.; Hallett, James E.; Joseph, Paul; Tretsiakova-McNally, Svetlana; Zhang, Tan; Blum, Frank D.; Eastoe, Julian

Composites of the industrially important polymer, poly(methyl methacrylate) (PMMA), were prepared by free-radical polymerization of MMA with varying amounts (1–30 wt. %) of sodium dioctylsulfosuccinate (Aerosol OT or AOT) surfactant added to the reaction mixture. The composites with AOT incorporated show enhanced resistance to thermal degradation compared to pure PMMA…
Poly(N,N-diallylazacycloalkane)s for Anion-Exchange Membranes Functionalized with N-Spirocyclic Quaternary Ammonium Cations

Olsson, Joel S.; Pham, Thanh Huong; Jannasch, Patric

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Poly(N,N-diallylazacycloalkane)s for Anion-Exchange Membranes Functionalized with N-Spirocyclic Quaternary Ammonium Cations

Olsson, Joel S.; Pham, Thanh Huong; Jannasch, Patric

The alkaline stability of organic cations tethered to anion-exchange membranes (AEMs) is essential for the long-term performance of alkaline membrane fuel cells and electrolyzers. Here, we have prepared and studied the thermal and alkaline stability of a series of polyelectrolytes functionalized with N-spirocyclic quaternary ammonium (QA) cations. N,N-Diallylazacycloalkane quaternary salts…
3D printing of CNT- and graphene-based conductive polymer nanocomposites by fused deposition modeling

Gnanasekaran, K.; Heijmans, T.; van Bennekom, S.; Woldhuis, H.; Wijnia, S.; de With, G.; Friedrich, H.

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3D printing of CNT- and graphene-based conductive polymer nanocomposites by fused deposition modeling

Gnanasekaran, K.; Heijmans, T.; van Bennekom, S.; Woldhuis, H.; Wijnia, S.; de With, G.; Friedrich, H.

Fused deposition modeling (FDM) is limited by the availability of application specific functional materials. Here we illustrate printing of non-conventional polymer nanocomposites (CNT- and graphene-based polybutylene terephthalate (PBT)) on a commercially available desktop 3D printer leading toward printing of electrically conductive structures. The printability, electrical conductivity and…
Effect of Nanodiamond (ND) Surface Functionalization on the Properties of ND/PEEK Composites

Wahab, Z.; Marsh, Z. M.; Tessema, A.; Kidane, A.; Stefik, M.; Anneaux, B. L.; Ploehn, H. J.

 Customer publications

Effect of Nanodiamond (ND) Surface Functionalization on the Properties of ND/PEEK Composites

Wahab, Z.; Marsh, Z. M.; Tessema, A.; Kidane, A.; Stefik, M.; Anneaux, B. L.; Ploehn, H. J.

This paper explores the effect of nanodiamond (ND) surface chemistry on the structure and properties of composites of ND melt-blended with poly(ether-ether-ketone) (PEEK). ND functionalized with phenylphosphonate (PPA) resulted in ND/PEEK composites with improved filler dispersion based on visual observations and surface topography measurements. As-received oxidized ND (OND) reduces PEEK's…
Structure formation in nanophase-separated systems with lamellar morphology: Comb-like vs. linear precision polymers

Danke, Varun; Gupta, Gaurav; Reimann, Sophie; Binder, Wolfgang H.; Beiner, Mario

 Customer publications

Structure formation in nanophase-separated systems with lamellar morphology: Comb-like vs. linear precision polymers

Danke, Varun; Gupta, Gaurav; Reimann, Sophie; Binder, Wolfgang H.; Beiner, Mario

We report findings of a comparative study of a comb-like polymer, poly(1,4-phenylene-2,5-n-didecyloxy terephthalate) and a linear chain precision polymer consisting of a methyl protected 2,6-diaminopyridine group after every 20th methylene unit of a linear saturated polyethylene chain . Both polymers exhibit lamellar morphologies related to a nanophase separation of the…
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