Untersuchungen zu Modifikationen von Polyamid‐6 und Polyamid‐4 mit eingelagerten Alkalihalogeniden

Votteler, Christine; Hoffmann, Volker; Trafara, Gundolf

doi:10.1002/macp.1984.021850917

Cited by 5 publications

(2 citation statements)

References 60 publications

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“…This is consistent with behavior of Li+ vibrations of material in which a lithium halide salt is dissolved in PA-6. 21 The Na+ ion-motion band is observed at ca. 210 cm-' for pure NaSPS and changes very little through series of (9.8%)NaSPS/PA-6 blends.…”

Section: Spectral Results a N D Analysismentioning

confidence: 99%

Molecular interpretation of miscibility in polyamide‐6 blends with alkali ionomers of sulfonated polystyrene

Rajagopalan

Kim

Brack

et al. 1995

J Polym Sci B Polym Phys

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SYNOPSISBlends of polyamide-6 with lithium ionomers of 9.8 and 5.4 mole percent sulfonated polystyrene, formed by combining solutions of these polymers, are miscible over a wide compositional range, but those with the equivalent sodium ionomers are not. The molecular origin of this difference is addressed by studying the far infared and infrared spectra of the blends and pure materials to follow changes in the interactions between the cations and their surroundings, and changes in the interactions between functional groups. Based on analysis of these spectra, a molecular level interpretation of the blending is proposed. The initial step involves both the interaction of one amide carbonyl with an Li+ ion and simultaneous hydrogen bonding between an amide N -H and a sulfonate group. This eventually leads to formation of an Li(>CO)i(n -4) entity while the sulfonates are converted to the acid form through hydrogen bonding to the amide N -H groups. The Na+ ion does not interact strongly enough with the amide groups to leave its sulfonate environment to a significant extent. 0 1995 John Wiley & Sons, Inc.

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Section: Spectral Results a N D Analysismentioning

confidence: 99%

Molecular interpretation of miscibility in polyamide‐6 blends with alkali ionomers of sulfonated polystyrene

Rajagopalan

Kim

Brack

et al. 1995

J Polym Sci B Polym Phys

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“…It is well-known that PA 6 and PA 66 are materials of high crystallinity. The high crystallinity of PA is explained by the intermolecular hydrogen bridge bonds, which are detectable by IR and NMR spectroscopies, for example (Votteler and Hoffmann, 1984;Simon and Argay, 1978).…”

Section: Resultsmentioning

confidence: 99%

High-quality polyamide/metal composites

Sirinyan¹,

Wolf²

1989

Ind. Eng. Chem. Res.

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Conventional wet-chemical metallization methods consisting of 10-15 steps can produce firmly adhering metal films only on two-phase and multicomponent systems such as ABS (acrylonitrilebutadiene-styrene) graft copolymers and high-impact polystyrenes. With the help of a newly developed process, it is now possible to cover the surface of polyamides, an important class of engineering plastics, with a metallic layer. The peeling strength of the metallic layer is much greater than has been realized with conventional ABS metallization methods. The adhesion between the polymer surface and the metal layer is improved by pretreatment of the polyamide injection moldings with a swelling solution containing a special Pd complex. The mechanical properties of the bulk polymer are not affected by the surface treatment. The metallized polyamide injection moldings exhibit good electrical conductivity and shield electronic equipment from electromagnetic interference and electronic eaves-dropping. The shielding effectiveness of the metallic layer is greater than 40 dB.

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