Temperature stable thermoplastic microwave materials and copper laminates

Walpita, L. M.; Ahern, M.R.; Chen, P.; Goldberg, Harris A.; Weinberg, Shari A.; Zipp, Christopher; Adams, Gary W.; Wong, Y.H.

doi:10.1109/epep.1998.733861

Cited by 1 publication

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“…The patents11–18 available basically describe the process of preparing hybrid fabric and composites and attention regarding resin‐fiber properties and their importance is not well documented.…”

Section: Introductionmentioning

confidence: 99%

Properties of high modulus PEEK yarns for aerospace applications

Shekar

Kotresh

Rao

et al. 2009

J of Applied Polymer Sci

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A study has been carried out on the influence of extrusion and drawing related process parameters with an object of obtaining high modulus poly ether ether ketone yarns that can be tailor made to meet critical requirements of aerospace applications. The influence of the interaction between rheological properties, spinning process variables, and drawing conditions has been given special attention to engineer a yarn that exhibit excellent structure property relationships. The wide angle X-ray diffraction results suggest that drawing carried out above glass transition temperature (T g ) influences the structure that include unit cell parameters, density, and mechanical properties. The degree of orientation characterized in terms of sonic velocity measured as high as 3 km/s with sonic modulus of 105 gpd. With progressive increase in draw temperature, crystallinity was found to increase, and useful properties were observed at an optimum draw temperature of 200 C (may be region of maximum crystallization rate) primarily attributed to the maximum crystallization temperature and the heat setting effect. Thermal studies (TGA) indicate that these materials can be used in high temperature applications (up to 250 C) for long time exposure and 500 C for short term exposure.

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Section: Introductionmentioning

confidence: 99%