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Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

Dose, Michelle E.; Chwatko, Malgorzata; Hubacek, Ivo; Lynd, Nathaniel A.; Paul, Donald R.; Freeman, Benny D.

Customer publications

Thermally cross-linked diaminophenylindane (DAPI) containing polyimides for membrane based gas separations

Dose, Michelle E.; Chwatko, Malgorzata; Hubacek, Ivo; Lynd, Nathaniel A.; Paul, Donald R.; Freeman, Benny D.

This study aims to expand structure-property relationships of diaminophenylindane (DAPI)-containing polyimides and the influence of thermal cross-linking on gas transport properties of such materials. A polyimide synthesized from hexafluoroisopropylidene diphthalic anhydride (6FDA), DAPI, and diaminobenzoic acid (DABA) in a molar ratio of 0.5/0.33/0.17, 6FDA0.5-DAPI0.33/DABA0.17, was crosslinked…
Flow-Induced Crystallization of Polyamide-6

Massaro, R.; Roozemond, P.; D’Haese, M.; Puyvelde, P. Van

Customer publications

Flow-Induced Crystallization of Polyamide-6

Massaro, R.; Roozemond, P.; D’Haese, M.; Puyvelde, P. Van

Flow-induced crystallization has been widely studied for a variety of polymers with the main focus on polyolefins. In this work, research has been conducted on the flow-induced crystallization of another important class of polymers, namely polyamides. Different polyamides-6 with varying molecular weight have been studied. At relatively modest values of…
Polymer nanocomposites: Insights on rheology, percolation and molecular mobility

Nadiv, Roey; Fernandes, Ricardo M. F.; Ochbaum, Guy; Dai, Jing; Buzaglo, Matat; Varenik, Maxim; Biton, Ronit; Furó, István; Regev, Oren

Customer publications

Polymer nanocomposites: Insights on rheology, percolation and molecular mobility

Nadiv, Roey; Fernandes, Ricardo M. F.; Ochbaum, Guy; Dai, Jing; Buzaglo, Matat; Varenik, Maxim; Biton, Ronit; Furó, István; Regev, Oren

The integration of carbon nanotubes (CNTs) into a polymer matrix strongly affects the rheological behavior that in turn may hamper the overall performance of the resulting composite. Research in this topic has focused on bulk rheological properties, while here we employ NMR diffusion experiments to explore the mobility (diffusivity) of…
Improving adhesion between aramid fibers and natural rubber through morphological and synthetic modification of the fibers

Kanbargi, Nihal; Lesser, Alan J.

Customer publications

Improving adhesion between aramid fibers and natural rubber through morphological and synthetic modification of the fibers

Kanbargi, Nihal; Lesser, Alan J.

ABSTRACT In this article, we present new methods to improve the adhesion between poly(paraphenylene terephthalamide) fibers and a natural rubber for tire reinforcement. Fiber pretreatments are applied to create new surface morphologies on the fiber that enables enhanced adhesion between the fiber and rubber matrix. The pretreated fibers are then…
Biodegradable Electrospun PLLA Fibers Containing the Mosquito-Repellent DEET

Bonadies, Irene; Longo, Alessandra; Androsch, René; Jehnichen, Dieter; Göbel, Michael; Laura Di Lorenzo, Maria

Customer publications

Biodegradable Electrospun PLLA Fibers Containing the Mosquito-Repellent DEET

Bonadies, Irene; Longo, Alessandra; Androsch, René; Jehnichen, Dieter; Göbel, Michael; Laura Di Lorenzo, Maria

The manuscript details the first literature example of fibers of poly(l-lactic acid) (PLLA) containing a mosquito repellent agent, N,N-diethyl-3-methylbenzamide (DEET). The fibers were prepared by electrospinning, are defect-free and have uniform diameter of the order of magnitude of 1 µm. Thermogravimetry and infrared spectroscopy showed that it is possible to…
Structure-Properties Relations for Polyamide 6, Part 2: Influence of Processing Conditions during Injection Moulding on Deformation and Failure Kinetics

Parodi, Emanuele; Peters, Gerrit W. M.; Govaert, Leon E.

Customer publications

Structure-Properties Relations for Polyamide 6, Part 2: Influence of Processing Conditions during Injection Moulding on Deformation and Failure Kinetics

Parodi, Emanuele; Peters, Gerrit W. M.; Govaert, Leon E.

The effect of processing conditions during injection on the structure formation and mechanical properties of injection molded polyamide 6 samples was investigated in detail. A large effect of the mold temperature on the crystallographic properties was observed. Also the the effect of pressure and shear flow was taken in to…
Drawing behavior and mechanical properties of ultra-high molecular weight polyethylene blends with a linear polyethylene wax

Shen, Lihua; Severn, John; Bastiaansen, Cees W. M.

Customer publications

Drawing behavior and mechanical properties of ultra-high molecular weight polyethylene blends with a linear polyethylene wax

Shen, Lihua; Severn, John; Bastiaansen, Cees W. M.

Ultra-high molecular weight polyethylene (UHMWPE; Mw = 103 kg/mol) is blended with a low molecular weight, linear polyethylene (PEwax; Mw = 1 kg/mol) and the solid state drawing behavior and mechanical properties are explored. The results indicate that the low molecular weight polyethylene wax acts as a solvent for the UHMWPE which leads to an improvement…
Structure–Properties Relations for Polyamide 6, Part 1: Influence of the Thermal History during Compression Moulding on Deformation and Failure Kinetics

Parodi, Emanuele; Peters, Gerrit W. M.; Govaert, Leon E.

Customer publications

Structure–Properties Relations for Polyamide 6, Part 1: Influence of the Thermal History during Compression Moulding on Deformation and Failure Kinetics

Parodi, Emanuele; Peters, Gerrit W. M.; Govaert, Leon E.

The deformation and failure kinetics of polyamide 6 samples prepared by several thermal histories were investigated by tests at different temperatures and relative humidities. PA6 samples were produced in quiescent condition and multiple cooling procedure. A characterization was performed to investigate the effect of the different thermal histories and the…
P-Type Low-Molecular-Weight Hydrogelators

Draper, Emily R.; Dietrich, Bart; Brasnett, Christopher; Sproules, Stephen; McDonald, Tom O.; Seddon, Annela M.; Adams, Dave J.

Customer publications

P-Type Low-Molecular-Weight Hydrogelators

Draper, Emily R.; Dietrich, Bart; Brasnett, Christopher; Sproules, Stephen; McDonald, Tom O.; Seddon, Annela M.; Adams, Dave J.

As the use of low-molecular-weight gelators (LMWGs) as components in single and multicomponent systems for optoelectronic and solar cell applications increases, so does the need for more functional gelators. There are relatively few examples of p-type gelators that can be used in such systems. Here, the synthesis and characterization of…
Impact of Molecular Architecture on Dynamics of Miktoarm Star Copolymers

Kinsey, Thomas; Mapesa, Emmanuel Urandu; Wang, Weiyu; Hong, Kunlun; Mays, Jimmy; Kilbey, S. Michael; Sangoro, Joshua

Customer publications

Impact of Molecular Architecture on Dynamics of Miktoarm Star Copolymers

Kinsey, Thomas; Mapesa, Emmanuel Urandu; Wang, Weiyu; Hong, Kunlun; Mays, Jimmy; Kilbey, S. Michael; Sangoro, Joshua

Broadband dielectric spectroscopy (BDS) is used to probe the chain and segmental dynamics of A2B2 and AB2 miktoarm star copolymers based on polystyrene (PS, A block) and polyisoprene (PI, B block) that display lamellar morphologies as determined using small-angle X-ray scattering (SAXS). While no changes in the distribution of PI…