Stable fiber

At HOY speeds, the rate of increase in orientation levels off but the rate of crystallization increases dramatically. Air drag and inertial contributions to the threadline stress become large. Under these conditions, crystallization occurs very rapidly over a small filament length and a phenomenon called neck-draw occurs (68,75,76). The molecular stmcture is stable, fiber tensde strength is adequate for many uses, thermal shrinkage is low, and dye rates are higher than traditional slow speed spun, drawn, and heat-set products (77). 

The conclusion that short stable fibers will not produce maximum physical properties is not theoretically correct. Both experiment and theory have concluded that with proper adhesion or bond between fibers and plastic matrix, maximum properties can basically be achieved by using relatively short stable fibers rather than continuous filament construction (39). To date the higher performances is overwhelming achieved with the continuous fibers. Also, the fibers used in RPs have the important potential of reaching values that are far superior (7,10). 

Chemical chemical and mechanical treatments Chemicals and heat properties (some unique properties) Long, strong, stable fibers yield sulfite Kraft, sulfite, soda 84... 

This is a development of the above where a fiber-optic linked hqnid sample transmission cell is integrated with the sample fast loop cabinet (Figures 5.24 and 5.25). There can be multiple sample streams, take-offs and fast loops, each with its own separate fiber-optic transmission cell. The analyzer can either be local with short fiber-optic runs to the sampling cabinet(s), or remote, where a safe area location for the analyzer module may be feasible, but at the cost of longer, potentially less stable fiber-optic runs. This system avoids physical stream switching. 

Polyester Stable Fibers Material used in synthetic fibers, textiles, apparel and other industrial products such as diapers, non-wovens and insulation. 

Not all plastics can be converted into practical fibers, however, because the intermolecular forces or crystallization tendency may be too weak to achieve useful stable fibers by axial orientation. Synthetic fibers are... 

Ooly(thiol esters) have been known for more than 25 years as stable, fiber-forming polymers for a brief review see Goethals (I). Still, they have attracted little attention among scientists and have not been produced on a commercial scale. In this article, we summarize these often incomplete results to get a better understanding of this class of polymers. 

Wider use of fiber-reinforced ceramic matrix composites for high temperature structural applications is hindered by several factors including (1) absence of a low cost, thermally stable fiber, (2) decrease in toughness caused by oxidation of the commonly used carbon and boron nitride fiber-matrix interface coatings, and (3) composite fabrication (consolidation) processes that are expensive or degrade the fiber. This chapter addresses how these shortcomings may be overcome by CVD and chemical vapor infiltration (CVI). Much of this chapter is based on recent experimental research at Georgia Tech. 

Meanwhile, a more stable fiber-shaped LIB was constructed based on CNT/LTO and CNT/LMO fiber electrodes without substrate. Benefited from the flexible fiber electrodes, the resulting fiber-shaped full LIB exhibited even a better flexibility and can be bent into... 

Zhang, Z. T, X. L. Chen, P. N. Chen et al. 2014. Integrated polymer solar cell and electrochemical supercapacitor in a flexible and stable fiber format. Advanced Materials 26 466-470. 

Graphite is moderately stable to oxidation. In addition, it can be utilized up to temperature of 3000° C. Consequently, this property is utilized to make high-temperature stable fibers. A distinction is made between two types carbon fibers and graphite fibers. Carbon fibers are produced at 1000-1500° C and contain 80%-95% elemental carbon. Graphite fibers, on the other hand, are produced by short-duration pyrolysis at 2500° C. Graphite fibers have carbon contents of 99%. 

All sheet structures made directly from fibers and filaments without intermediate steps are classified under the term textile composites. In the English-speaking world, a general distinction is made between nonwoven fabrics made from stable fiber and spun-bonded sheet products manufactured from filaments. 

Could a similar phenomenon occur in the melt Were thermotropic polymers possible They were possible, and indeed the number reported to date by academic and industrial researchers is nearly beyond count. In addition, as it later turned out, aromatic thermotropic polymers were found to offer a great many more useful properties than just their now well-known tensile capabilities. These polymers are injection moldable, albeit at temperatures in the vicinity of 400° C, a temperature not compatible with common melt-spinning equipment. The rate of thermal degradation of such a polyester at 400° C makes stable fiber production particularly difficult. Moreover, most conventional injection-molding equipment requires modification to operate at the high temperatures needed to ensure reasonable processing of this polymer. 

Schola, of United Technology Research Center, believes that it is not necessary to use the most thermo-oxidatively stable fiber to achieve a good high temperature system. Although T-40 has a greater thermo-oxidative stability than AS4 or Celion G30-500, the retention of properties is better with these low modulus fibers. The thermo-oxidative stability is not directly related to the presence of impurities such as Na or K. Rather, it is a function of the... 

The precursor for the Tyratuio fibers is also polycarbosilane but it is cross-linked with a titanium alkoxide which provides a more thermochemically stable fiber. Final composition is (by weight) 51%Si, 28%C, 18%0, and 3% Ti.[ ][461... 

Poly[2,2 -(m-phenylene)-5,5 -bisbenzimidazole] was chosen as the most promising candidate for further development as a fibrous material. Under the terms of an Air Force contract, DuPont was able to spin fibers from both dimethyl-sulfoxide and dimethylacetamide solutions to form relatively strong, thermally stable fibers. In 1963, an Air Force contract was awarded to Celanese Research Co. for the development of a manufacturing process for the scale-up of PBI production. PBI fiber of tenacities 0.31-0.44 N/tex (3.5-5.0 gfiden) were produced in sufficient quantity for large-scale evaluation. The fiber was discovered to have... 

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