Poly(esterimide) Wire Enamels: Coatings with the Right Combination of Thermal and Mechanical Properties for Many Applications

Biondi, Giovanna

doi:10.1002/mame.200700363

Cited by 8 publications

(4 citation statements)

References 11 publications

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“…In this article, we investigate the imidization reaction as a function of the primary amine, to target a high content of imide group (higher than 50 mol%) while keeping constant the acid group content (about 10 mol%). The presence of imide group in the polymer structure increases the thermal stability 14. Thus, imidization in the presence of functional primary amines will allow incorporating functional groups onto PMMA.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of glutarimides from PMMA copolymers, part 3: Use of functional amines

Manseri¹,

David²,

Joly‐Duhamel³

et al. 2010

J of Applied Polymer Sci

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Imidization reactions onto PMMA copolymers were performed in the presence of primary amines. This study allowed establishing a correlation between the functional group of the primary amine and the reactivity of the primary amine toward ester groups of PMMA. This correlation was allowed by using model PMMA/PMAA copolymers, i.e., obtained using a chain transfer agent by radical polymerization. According to the suggested mechanism of PMMA imidization, methylamine afforded higher content of glutarimide groups, hence leading to high T g values of about 160 C. The use of bulky groups for the primary amine instead, i.e., cyclohexyl, decreased the content of glutarimide function. Thermogravimetric analysis revealed a high thermostability of imidized PMMA with a starting degradation temperature of about 400 C, also dependant of the amine functional group.

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Section: Introductionmentioning

confidence: 99%

Synthesis of glutarimides from PMMA copolymers, part 3: Use of functional amines

Manseri¹,

David²,

Joly‐Duhamel³

et al. 2010

J of Applied Polymer Sci

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“…[28][29][30] The conductor materials can be coated with a protective layer to avoid material-typical defects, such as abrasion of the metal coating, as well as to protect against environmental influences or short circuits. 31,32 For our tests, bare hybrid conductive yarns were selected because of their good electrical performance.…”

Section: Methodsmentioning

confidence: 99%

Interconnecting embroidered hybrid conductive yarns by ultrasonic plastic welding for e-textiles

Dils

Kapp

Reboun

et al. 2022

Textile Research Journal

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This article presents a novel approach for the electrical interconnection of embroidered conductive yarns with each other at defined cross-points using ultrasonic spot welding. The electrically conductive yarns are made of silver-coated copper microwires plied with polyester filament fibers into a hybrid embroidery yarn. In this study we evaluated the influence of different material properties (number of microwires of conductive yarn, fabric substrate, and adhesive film), the embroidery designs of contact pads, and the main parameters of the welding process (energy, force, amplitude, and tools) on the welded interconnection. The results were evaluated by the process yield and the contact resistance of the welded contacts. The electrical contacts were then tested for long-term reliability (elevated temperature and humidity, temperature shock change, bending, washing and drying) and analyzed. In addition, the contacts were examined with scanning electron microscopy (SEM) and micro-computed tomography and in the form of cross-sections with optical and SEM techniques to discuss interconnection and failure mechanisms. The results show that ultrasonic spot welding can enable the production of highly reliable interconnections of textile-integrated conductive yarns with contact resistances of a few milliohms that are resistant to mechanical, environmental, and washing conditions, leading to potential new manufacturing processes of e-textiles.

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“…The PAI is often utilized for overcoating enamelled wires that already feature a polyesterimide (PEI) basecoat. In fact, the PAI topcoat improves the magnet wire properties by ensuring a better abrasion resistance along with an enhanced temperature resistance [19].…”

Section: Discussionmentioning

confidence: 99%

Unconventional accelerated thermal ageing test for traction electric motors in vehicles

Lusuardi

Cavallini

Madonna

et al. 2020

2020 IEEE Electrical Insulation Conference (EIC)

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Car manufacturers are increasingly working to make the all-electric car a reliable and affordable mobility option for a larger section of the population. However, several issues need to be addressed before achieving this goal. One of the problems is represented by the qualification of the insulation systems employed in electric motors. Unfortunately, the tests to be performed are time consuming and the design of such measurements very often is done by trial and error, further lengthening the validation phase. In addition, since cars are exposed to variable torque and speed operations (especially when driven in city traffic), the stator winding temperature is expected to vary in a wide range. Nevertheless, indications regarding the impact that highly variable temperature conditions play on the insulation reliability are not available, at the moment. In this work, the results of accelerated thermal aging tests using temperature profiles (i.e. variable temperature ageing) are presented and discussed. The experiments are accomplished on simplified insulation systems for electric motor (i.e. specimens) and cycling temperature profiles, ranging between 200°C-260°C and featuring different thermal gradients, are applied as ageing stress. Finally, the possibility of relying on statistical techniques for improving the quality of prediction, while shortening the testing time, is explored.

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Poly(esterimide) Wire Enamels: Coatings with the Right Combination of Thermal and Mechanical Properties for Many Applications

Cited by 8 publications

References 11 publications

Synthesis of glutarimides from PMMA copolymers, part 3: Use of functional amines

Synthesis of glutarimides from PMMA copolymers, part 3: Use of functional amines

Interconnecting embroidered hybrid conductive yarns by ultrasonic plastic welding for e-textiles

Unconventional accelerated thermal ageing test for traction electric motors in vehicles

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