Tensile performance

Assume that the table represents typical production-hne performance. The numbers themselves have been generated on a computer and represent random obseiwations from a population with I = 3.5 and a population standard deviation <7 = 2.45. The sample values reflect the way in which tensile strength can vary by chance alone. In practice, a production supervisor unschooled in statistics but interested in high tensile performance would be despondent on the eighth day and exuberant on the twentieth day. If the supeiwisor were more concerned with uniformity, the lowest and highest points would have been on the eleventh and seventeenth days. 

Only very recently the production of melt-blown polypropylene fleeces with considerably thinner fiber diameter became possible [100], thus making it possible — a low-cost hydrophilization provided — to achieve attractive properties with regard to small pore size and excellent tensile performance for use in highly automated assembly processes. 

Performance vs Crosslinker Level. Table IV presents tensile and swell Index results on a series of approximately 0 C Tg VAE emulsion copolymers. ABDA containing copolymers had fair swell Index values which deteriorated rapidly as ABDA levels declined, but showed slow declines In wet tensile performance with reduced levels. Possible reasons for this are discussed below. 

B) Tensile and Impact Performance Table I presents a summary of tensile impact and ultimate tensile data for the three sets of composites. For ease of comparison both sets of data are normalized to the reference tensile impact or ultimate tensile performance of the unfilled polymer matrix. 

Ha, SR, Ryu, SH, Park, S J, Rhee, KY. 2007. Effect of clay surface modification and concentration on the tensile performance of clay/epoxy nanocomposites. Mater Sci Eng A-Struct 44S 264—268. 

Wu, CL, Zhang, MQ, Rong, MZ, Friedrich, K. 2002. Tensile performance improvement of low particles fllled-polypropylene composites. Compos Sci Technol 62 1327-1340. 

From a mechanical point of view, high density polyethylene (HDPE)/isotactic polypropylene (iPP) blend have generally been considered as very unsatisfactory materials In particular, they show very poor ultimate mechanical properties at room temperature in comparison with those of the blend constituents. This fact precludes their use for most commercial purposes. In previous papers we found that it is possible to improve the mechanical tensile performance of these blends by appropriately varying the testing conditions such as the temperature and the drawing rate. 

Static and dynamic thermomechanical analysis of the commercial polymer separators (PP and PE) were made to understand their properties (Love, 2011). Anisotropic separators manufactured from a dry process showed limited tensile performance in the transverse direction. The separators prepared from a wet process displayed a uniform and biaxial structure and nearly showed identical mechanical strength on both directions. It was also found that small losses in mechanical integrity were observed after the separators were exposed to various electrolytes. 

Owing to the different compositions used in the manufacture of the yams, each yam has a different linear density and exhibits different tensile performance. 

Technical textiles requiring higher levels of tensile performance mechanical rubber goods (MRGs) 328... 

Alkalization leads to the loss of hemicellulose and lignin resulting in weight loss of fibers and increase in cellulose content. Properly applied alkalization enhances the tensile performance and thermal resistance of agro-residual fibers. Increasing the concentration, duration and temperature of alkalization treatment results in a decrease in fiber diameter. However, if the applied treatment is too strong that leads to strength loss of fibers [ 11 ]. Mahato et al. [55] reported decrease of crystallinity upon alkalization of coir fibers. 

The hyperbranched polymer used in Ref. 19 had little beneficial effect on the tensile performance. The HSP of this polymer are not known but are likely to be a significant distance from PLA. But by in situ anhydride reactions (which, incidentally, would be expected to reduce the incompatibility with PLA), the hyperbranched polymer becomes cross-linked into a matrix, which gives big increases in toughness and elongation at break. 

One of the initial motivations for developing thermotropic LCPs was the search for high-tensile-performance fibres with properties similar to those exhibited by DuPont s Kevlar , a lyotropic LCP [3]. As polymer developments continued, the wholly aromatic, thermotropic polyesters were found to offer useful properties in addition to excellent tensile capabilities, especially as engineering thermoplastics [4]. 

Figure 2 reprinted from Compos. Sci. TechnoL, Vol. 62,2002, Authors C. L. Wu, M. Q. Zhang, M. Z. Rong, K. Friedrich, Title Tensile performance improvement of low nanoparticle-filled polypropylene composites, p. 1327, Copyright (2004), with permission from Elsevier Science. 

Silica nanoparticles as surfactants and fillers for latexes made by miniemulsion polymerization. Langmuir, 17 (19), 5775-5780 (c) Wu, C.L., Zhang, M.Q., Rong, M.Z., and Friedrich, K. (2002) Tensile performance improvement of low nanoparticles filled-polypropylene composites. Compos. Set. Technol., 62 (10 11), 1327 1340 (d) Wu, C.L., Zhang, M.Q., Rong, M.Z., and Friedrich, K. (2005) Silica nanoparticles filled polypropylene effects of particle surface treatment matrix ductility and particle species on mechanical performance of the composites. Compos. Set. Technol., 65 (3 ), 635 645. 

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