Nylon experimental

The strength of acetate yarn upon exposure to dry heat (120°C) for 500 hr is reduced by 58%. That of triacetate yarn is reduced by 30% at 130 °C (68). In another publication (73) heat aging experiments indicate that the strength retention of triacetate is greater than cotton, which in turn is greater than nylon. Experimental details, however, are lacking in the aging conditions and the type and form of the fibers. 

Now that three separate values for the failure torque have been found for this shaft, the logical question Is which (If any) of the answers Is correct. The answer to this question depends very strongly on the nature of the material Investigated. For very brittle materials (e.g., cast unplastlclzed polystyrene), experiments have shown that the maximum principal stress criterion gives quite reasonable results. For ductile materials such as molded nylon, experimental evidence Indicates that either the maximum shear stress or octahedral shear stress criterion Is more appropriate. 

Ducts and Canals.—Prostheses implanted in the urinary tract have been discussed with reference to the use or potential use of poly(ethylene terephthalate), silicone rubber, polytetrafluoroethylene, poly(vinyl chloride) and nylon. Experimental work on uretral and urethral replacement involves, principally, composites of poly(ethylene terephthalate) and silicone rubber. A new silicone rubber prosthetic bladder is described and a preliminary report of an implantable lung in J. H. Dumbleton, Wear, 1978, 49, 297. 

TABLE 10.3 Effects of Experimental Conditions on the Depolymerization Efficiency of Nylon-4,6... 

INVISTA Nylon Intermediates Experimental Station, Wilmington, DE19880-0302... 

Figure 12.4 shows an example of experimental set up for a classical measurement of heat capacity the sample is glued onto a thin Si support slab. The thermometer is a doped silicon chip and the heater is made by a ( 60 nm thick) gold deposition pattern. Electrical wiring to the connect terminals are of superconductor (NbTi). The thermal conductance to the thermal bath (i.e. mixing chamber of a dilution refrigerator) is made with thin nylon thread. The Si slab, the thermometer and the heater represent the addendum whose heat... 

In this section a short description of a comparison between experimental and simulation results for heat transfer is illustrated (Nijemeisland and Dixon, 2001). The experimental set-up used was a single packed tube with a heated wall as shown in Fig. 8. The packed bed consisted of 44 one-inch diameter spheres. The column (single tube) in which they were packed had an inner diameter of two inches. The column consisted of two main parts. The bottom part was an unheated 6-inch packed nylon tube as a calming section, and the top part of the column was an 18-inch steam-heated section maintained at a constant wall temperature. The 44-sphere packed bed fills the entire calming section and part of the heated section leaving room above the packing for the thermocouple cross (Fig. 8) for measuring gas temperatures above the bed. 

Courtship trials were performed in outdoor areas measuring 1 x 1 x 1 m and constructed of nylon fabric attached to metal posts (Moore, LeMaster and Mason 2000). Groups of ten actively courting male snakes were placed in an arena and allowed to acclimate. A female (n = 10) or newly-emerged male (n = 10) was then placed into each arena and the snakes were allowed to interact undisturbed for three minutes. The number of males actively courting the experimental animal at the end of the three-minute period was then recorded. Unique experimental animals and actively courting males were used for each trial. 

To make cut pile carpets, two strands of BCF yarns are twisted together and heat-set with steam using a Superba heat setting machine at 135-145 °C or at 175-195 °C when heat-set with super-heated steam in a Suessen. An experimental design experiment [94] showed the higher the heat set temperature, then the lower is the bulk of the final carpet, but there is an increase in the tip definition and walk performance. The tufted carpets are then dyed with disperse dyes at atmospheric boil [95] in a continuous or a batch process. PTT carpets showed excellent resiliency in walk test experiments, equivalent to a nylon and much better than both PET and polypropylene, had lower static charge of <3.5 kV, and were resistant to coffee, mustard, betadine, red acid dyes and other stains [96],... 

In 1928, Speed became a consultant to the DuPont Experimental Station due to the nudging of Roger Adams. Chemistry was on the rise with the invention of the first SR (neoprene) and first truly synthetic fiber (nylon) both discovered by Carothers. The plastics industry developed rapidly with chemistry truly becoming an industrial giant, mainly on the back of giant molecules. 

Figure 1.11 Adiabatic conversion of nylon 6 Experimental data for initial polymerization temperatures of 117°C (bottom line), 136°C (middle line), and 157°C (top line) with acyllactam and caprolactam-magnesium-bromide concentrations of 70 and 108mmol/L, respectively...

The amount of surface adsorption of a number of proteins ranging in molecular mass from 6.5 to 670 kDa and isoelectric point (pi) from 4.3 to 10.5 to several commonly used container surfaces (glass vials either untreated, siliconized, sulfur treated or Purcoat treated plastic vials polyester + 0.3%, polyester 5x0, PP, and nylon). A 5-mL volume of protein solution was added to each vial, yielding a surface-to-volume ratio of 2.4cm2/mL. No correlation was found between the amount adsorbed and the molecular mass or isoelectric point, although glass surfaces appeared to bind more protein under the experimental conditions examined [156]. 

Fig. 9. Experimental integral permeability plots for Dyes I—III through Nylon 6 membranes according to Eq. (14)84) (with CDS1 varying between zero and a small finite value to the extent indicated by the horizontal bars) O Dye I A Dye II Dye III...

Fig. 9.35 Experimentally measured SBPs, by cooling experiments as in Fig. 9.22 (nylon) and theoretically calculated SBP (solid curve). Circles and triangles as in Fig. 9.34. Note the increasing solid-bed width in the tapered section. Operating conditions as follows Tb = 575°F N = 60 rpm P — 3000 psi G = 53.1 lb/h. [Reprinted by permission from Z. Tadmor and I. Klein, Engineering Principles of Plasticating Extrusion, Van Nostrand Reinhold, New York, 1970.]...

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