Manufacture and properties of a structural synthetic polymer fiber-containing nanoclay for concrete reinforcement

Abstract

This study established the optimum conditions for structural synthetic polymer fiber manufacture to make a fiber having excellent tensile strength. Two polypropylene resins, differing in their melt indices, and four different draw ratio values were investigated, that is, 6, 7, 8, and 9, to establish which had the greatest influence on tensile strength. The tensile strength and the modulus of elasticity were measured for the manufactured fibers. In addition, nanoclay was added to polypropylene and polyolefin fibers to improve the mechanical properties of fiber-reinforced cementitious composites. The optimum mixing ratio and draw ratio of the synthetic polymer fibers were established prior to nanoclay addition. Fiber mixing ratios (polypropylene:-polyethylene) of 100:0, 90:10, and 85:15, a draw ratio of 8, and nanoclay additions of 1, 3, and 5 wt% were studied. The modulus of elasticity improved with nanoclay addition, while the tensile strength remained almost unchanged, except in the case of 100% polypropylene with 5 wt% nanoclay. POLYM. COMPOS., 34:1698COMPOS., 34: -1709COMPOS., 34: , 2013

Fabrication of lightweight and flexible cellulose acetate composite nanofibers for high‐performance ultra violet protective materials

“…The spectrophotometric UV transmission records were used to determine the ultraviolet protection factor (UPF). The UPF of textile materials can be presented as [2,6]:…”

“…Therefore, efforts were made to reduce its effect using UV absorbing/blocking materials. Sunlight UV is usually divided into three groups in order of increasing energy: UV-A (315 or 320-400 nm), UV-B (280-315 or 320 nm), and UV-C (100-280 nm) [6,7]. The earthy sunlight UV consists of only UV-A and UV-B with wavelength of 280-400 nm, because UV-C is completely absorbed by the ozone layer in the atmosphere [1].…”

“…To overcome these matters, electrospun nanofibers with nonwoven structures are proposed to be a promising alternative due to their high surface area, lightweight, high porosity, superior mechanical properties, good flexibility, and suitability to prepare on large scale [10][11][12]. Several studies have been carried out to understand the UV protection properties of the electrospun nanofibers embedded with various metal oxide nanoparticles such as magnesium oxide (MgO) [2,13], aluminum oxide (Al 2 O 3 ) [2], cerium dioxide (CeO 2 ) [14], titanium dioxide (TiO 2 ) [15][16][17], zinc oxide (ZnO) [6,11,[18][19][20], and so on. Among them, ZnO nanoparticles are of great attention because of their excellent thermal conductivity, high refractive indices, wide band gap (3.37 eV), and good stability at high temperatures treatment [8,11].…”

“…The UV protection of electrospun composite nanofibers depends on a number of parameters. As described in the literature, the nanoparticles content [6,16], average diameter of nanofibers [17], nanofibers surface area, and thickness of the electrospun nanofibers [2,6,18] have the most significant parameters influence in the UV protection factor. Basically, finding the correlation between these input significant parameters with UV protection factor will be worthwhile to fabricate high-performance UV blocking materials.…”

Interfacial phenomena in structural polymeric nano-clay synthetic fiber reinforced cementitious composites

“…Furthermore, their use results in improved resistance to corrosion compared to steel reinforcement, with less risk for workers, and is less expensive [14,19]. However, despite these advantages, polyolefin structural synthetic fibers have poor bonding characteristics due to their chemical inertness and hydrophobicity [24,25].…”