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Thermogravimetric Analysis of Blends Based on Nylon 6 and a Thermotropic Liquid Crystal Copolyester (1998)

Campoy, I. ; Gómez, M. A. ; Marco, C.

Springer

Journal of thermal analysis and calorimetry 52 (1998), S. 705-715

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ISSN: 1572-8943

Keywords: blends ; Nylon 6 ; thermogravimetry ; Vectra A

Source: Springer Online Journal Archives 1860-2000

Topics: Chemistry and Pharmacology

Notes: Abstract The thermal stabilities of blends between Nylon 6 and the liquid crystal copolyester Vectra A were investigated by thermogravimetric analysis under dynamic and isothermal conditions. The theoretical mass loss curves were compared with the experimental ones in order to establish the influence of blending on the thermal stabilities of the pure polymers. The characteristic degradation temperatures and the relative values of the volatilized matter percentages were obtained from the dynamic curves, and the effect of the blend composition was analysed. The resulting data, together with the analysis of the activation energies, demonstrated that blending has an important effect on the thermal stability of Vectra A, which undergoes a considerable destabilization in the presence of Nylon 6.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1023/A:1010142002963

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Measurement of mechanical properties of ligament substance from a bone-ligament-bone preparation (1983)

Woo, S. L-Y. ; Gomez, M. A. ; Seguchi, Y. ; [et al.]

Hoboken, NJ [u.a.] : Wiley-Blackwell

Journal of Orthopaedic Research 1 (1983), S. 22-29

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ISSN: 0736-0266

Keywords: Mechanical properties ; Medial collateral ligament substance ; Strain ; Strain distribution ; Strain variations ; Life and Medical Sciences

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Medicine

Notes: This investigation presents a new approach in the measurement of the mechanical properties of the ligament substance from tensile testing of a bone-ligament-bone complex. Such basic information should be one of the necessary prerequisites in the evaluation of ligament repair as well as reconstruction by autogenous tissue grafts or artificial ligament implants. The use of a video system permits the determination of tensile strains of the mid-medial collateral ligaments from the canine, swine, and rabbit without mechanically interfering with the ligament deformation during testing. This methodology further eliminates the difficulties of measuring the initial length of the entire medial collateral ligament, as its insertions to bones are ambiguous and cover a large area. It was found that the strain of the ligament substance is consistently and considerably less than specific deformation of the bone-ligament-bone complex. These data suggest that the ligament-bone structure stretches nonuniformly with the highest deformation occurring near or at the ligament insertion sites to bone. Other interesting findings include the variation of tensile strains along the ligament substance for all animal species studied.

Additional Material: 9 Ill.