Heat-induced aging

Linen textiles made from flax fibers have been known and used by mankind since antiquity (1 ). Flax has been used in many textile constructions including fine linen fabrics, laces, embroideries, and bridal fashions, and many historic linen textiles have become part of permanent museum collections. Older linen fabrics and laces are prized for their natural creamy color and luster and often have been recycled and reused. However, little is known about natural aging of linen. Most aging studies for cellulosics such as linen have involved accelerated heat-induced aging. 

Since so little is known about heat aging of linen, we examined the dry heat-induced aging of linen at 180°c from 1 hr. to 10 hrs. 

Heat-Induced Aging. Linen samples (12 x 4 ) were washed in deionized water containing 0.1% Triton X-100 surfactant, rinsed, and air dried. The samples were aged at 180°C in a forced draft laboratory oven for 1, 3, 5 or 10 hrs. The samples were removed from the oven and conditioned at 21<>c and 65% RH prior to testing. 

NEEDLES NOWAK Heat-Induced Aging of Linen... 

Ralox TMQ is a highly effective agent that prevents heat-induced aging and also provides minor protection against ozone and fatigue crack failure. Its major field of application is with black elastomers based on SBR, NR, IR, BR and NBR, as well as latices. A highly effective agent, Ralox TMQ is also added to polyethylene that has been cross-linked with peroxide. 

Ralox TMQ is a highly effective agent that prevents heat-induced aging with black vulcanlsates based on SBR, NR, IR,... 

Sometimes AGEs have been localised using formalin-fixed paraffin-embedded tissue sections after heat-induced epitope retrieval, a process that could be responsible for the conversion of Amadori products to AGEs. Hayashi et al.401 therefore compared the reactivity of a monoclonal antibody to CML as an important AGE in... 

Over the service life of a PO, heat-induced degradation can cause losses of multiple desired mechanical properties and inaeased embrittlement. This is shown in Figure 3.3, which compares long-term heat aging (LTHA) of heat-stabilized... 

Oreski, G., Wallner, G.M. Damp heat induced physical aging of PV encapsulation materials. In 12th IEEE Intersociety Conference on Thtamal and Thermomechanical Phenomena in... 

PBl and PI have been found to be soluble in DMAc, as well as DMF and NMP, and thus blends can be prepared by solution mixing, followed either by precipitation into a non-solvent hke methanol or by casting a film. The of a 50/50 blend has been measured at 380°C. The ratio of PI in the blend should be governed by the level of moldabihty needed and the decreased susceptibility to moisture regain required of the application. Heat-induced cross-linking may lead to further utility of such blends, such as modified softening temperature and solvent resistance under stress-enhanced Tg with aging conditions. ... 

Blake, M.J., Udelsman, R., Feulner, G.J., Norton, D.D., Holbrook, N.J. (1991). Stress induced heat shock protein 70 expression in adrenal cortex An ACTH-sensitive. age-dependent response. Proc. Natl. Acad. Sci. USA 88, 9873-9877,... 

Analysis of two nickel-containing DFCC revealed that neither heating in air or in steam induced intraparticle transfer of nickel at the thermal and hydrothermal conditions used to age the fresh catalysts (11) prior to microactivity testing. 

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