Results 151 to 160 of about 22,670 (199)

Rheological characterization of filled polyamide 11 and polyamide 12 solutions in polyols

Journal of Applied Polymer Science, 2019
ABSTRACTA thorough understanding of the rheological properties of real‐world, formulated polymer melts and solutions is important to fabricate articles via typical melt processing techniques. Polyamides have been studied extensively in the area of water purification applications.
Kshitish A. Patankar, Valeriy V. Ginzburg, Gerald F. Billovits   +2 more
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Cyclische monomere und oligomere in polyamid‐11 und polyamid‐12

Die Angewandte Makromolekulare Chemie, 1973
AbstractDer Gleichgewichtsgehalt an cyclischen Monomeren in hydrolytisch Polymerisiertem Polyamid‐11 und Polyamid‐12 bei 280°C wurde aus den Cyclisierungs‐konstanten nach STOLL und ROUVé sowie nach MORAWETZ und GOODMAN, der Gehalt an cyclischen Dimeren und Trimeren nach den statistisch abgeleiteten Beziehungen von JACOBSON und STOCKMAYER berechnet.Die ...
Von R. Feldmann, R. Feinauer
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Generalization of the static mechanical properties of plasticized polyamide-12 and polyamide-6

Polymer Science U.S.S.R., 1989
Abstract Generalization of the static mechanical properties of plasticized PA-12 andthe method of reduced variables over a wide temperature range has yielded a discrete series of values of the effective activation energy corresponding to the main relaxation processes. The character of change in effective activation energy with strain is regarded as a
J.V. Ivankina, I.G. Kuznetsova, V.V. Kovriga   +2 more
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New solvent for polyamides and its application to the electrospinning of polyamides 11 and 12

Polymer, 2007
Polyamides with long hydrocarbon chains, e.g. PA11 and PA12, are generally dissolved in phenolic or fluoric solvents that prevent these polymers from being electrospun and used in many applications because of their high boiling point and/or prohibitive cost. We demonstrate that a mixture of formic acid and dichloromethane can lead to the dissolution of
Kris Behler, Mickael Havel, Yury Gogotsi
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Relaxational properties of plasticized polyamide-12

Polymer Science U.S.S.R., 1979
The dielectric relaxation characteristics of polyamide-12 (polydodecalactam), plasticized by sulphonamides of the type RSO2NHC4H9 (where R is phenyl, β-naphthyl, 3-pyridyl or 8-quinolyl), were studied over a wide range of temperatures and frequencies (−100°C to + 100°C and 0.5–200 kHz). The glass temperature and relaxation time were determined, and the
A.I. Suvorova, T.P. Kashpurova, N.I. Novikov, A.A. Dukor, I.A. Nizova   +4 more
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Crystal structures and their effects on the properties of polyamide 12/clay and polyamide 6–polyamide 66/clay nanocomposites

Journal of Applied Polymer Science, 2006
AbstractBoth polyamide 12 (PA 12)/clay and polyamide 6–polyamide 66 copolymer (PA 6/6,6)/clay nanocomposites were prepared by melt intercalation. The incorporation of 4–5 wt % modified clay largely increased the strength, modulus, heat distortion temperature (HDT), and permeation resistance to methanol of the polyamides but decreased the notched impact
Y. Zhang, J. H. Yang, T. S. Ellis, J. Shi   +3 more
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One‐pot synthesis of polyamide 12,T–polyamide‐6 block copolymers

Journal of Polymer Science Part A: Polymer Chemistry, 2011
AbstractPolyamide 12,T–polyamide‐6 (PA‐12,T–PA‐6) block copolymers were synthesized by anionic polymerization of caprolactam using a PA‐12,T macrocoinitiator (McI). PA‐12,T McI and its precursors are soluble in molten caprolactam allowing for both the McI step‐growth polymerization and anionic polymerization to be performed in one‐pot.
Theodore F. Novitsky, Lon J. Mathias
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Investigation of structure development in polyamide 11 and polyamide 12 tubular film extrusion

Polymer Engineering & Science, 2002
AbstractThe processability of single bubble polyamide 11 and polyamide 12 films was investigated. The development of crystalline structure and chain orientation of polyamide 11 and polyamide 12 films in single bubble film blowing was studied by differential scanning calorimetry (DSC), wide angle X‐ray diffraction (WAXS), infrared (IR) spectroscopy, and
Sangkeun Rhee, James L. White
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Structure and properties of polyamide 12 alloys

2007
Polymer alloys composed polylaurolactam (polyamide 12) and segmented polyalurolactam with different content of soft segments are interesting engineering thermoplastic materials having a broad spectrum of properties. The reason for this broad spectrum are the phase structure and the special interactions between the components at the phase boundaries ...
G. Goldbach, M. Kita, K. Meyer, K. P. Richter   +3 more
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Orientation of the lamellar crystals in polyamide 12

Polymer, 1993
Three types of oriented samples of polyamide 12 have been investigated by electron microscopy, and small- and wide-angle X-ray diffraction: (a) sedimented mats of single crystals obtained by filtration from dilute solution; (b) melt crystallized samples oriented by unidirectional rolling and; (c) samples obtained by extrusion just below their melting ...
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