Materials Literature
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Abstract The objective of this study is to demonstrate the feasibility of using esterified derivatives of corncobs to clean back condensates from high‐pressure industrial boilers. Copper ions were retained by these modified natural polymers based within working pH and temperature conditions even at very low concentrat…
Abstract Montmorillonite (MMT) was modified with dodecylamine, 1,12‐diaminododecane, and 1,11‐aminoundecanoic acid to prepare CHMMT, NHMMT, and COMMT, respectively. The three clays were mixed with poly( L ‐lactide) (PLLA) with the aid of chloroform. Depending on the modifiers, PLLA/MMT composites exhibited different m…
Abstract Acrylonitrile butadiene rubber (NBR) was used as a polymeric plasticizer in poly(vinyl chloride) (PVC) for the partial replacement of di(2‐ethyl hexyl)phthalate (DEHP). The effect of this partial replacement on DEHP leaching from the PVC was evaluated at 10, 25, and 40°C. The study shows that the incorporatio…
Abstract A series of waterborne polyurethane (WPU) derived from isophorone isocyanate and poly(tetramethylene glycol) were modified by hydroxyl‐terminated polydimethylsiloxane (HPMS). The solutions were then cast into films named as PUHS. Rheological behavior of the emulsions were studied using Rheometer and morpholog…
Abstract Bahera gum, extracted from the bark of Terminalia bellerica , is a waste material. The present study involves the use of this natural gum as a multifunctional additive in natural rubber (NR) and brominated isobutylene‐ co ‐paramethyl styrene (BIMS). Fourier transform infrared (FTIR) analysis was employed to s…
Abstract To introduce N ‐methylmorpholine‐ N ‐oxide (NMMO) process to prepare antibacterial lyocell fiber, the blend films of O ‐carboxymethyl chitosan (O‐CMCS) and cellulose were prepared. O‐CMCS in aqueous suspension with particles having a surface mean diameter of 2.24 μm was blended with cellulose in NMMO hydrate.…
Abstract A hyperbranched polyethoxysiloxane was synthesized via hydrolytic polycondensation between methyltriethoxysilane (MTES) and tetraethoxysilane (TEOS), with hydrochloride acid as catalyst. FTIR, 1 H NMR, 29 Si NMR, and GPC measurements confirmed that the polyethoxysiloxane synthesized was indeed a hyperbranched…
Abstract The grafting copolymerization of maleic anhydride (MAH) onto styrene‐butadiene‐styrene terpolymer (SBS) was carried out through a new synthesis method––solvothermal synthesis. Infrared (IR) spectra and solid state 13 C‐NMR confirmed that maleic anhydride was successfully grafted onto the SBS backbone. The eff…
Abstract Neutral protease was immobilized on glutaraldehyde‐pretreated N ‐succinyl chitosan hydrogel beads and the biocatalyst obtained was used for the preparation of low molecular weight chitosan and chito‐oligomers with molecular weight of 1.9–23.5 kDa from commercial chitosan. Factors affecting the chitinolytic hy…
Two solid Lewis acids, namely Sn-Beta and Sn-MCM-41, have been applied to the Carbonyl-Ene reaction of -pinene and -methylstyrene with paraformaldehyde. For the more bulky molecule -pinene the mesoporous material Sn-MCM-41 has been found to be the better catalyst whereas for the smaller -methylstyrene Sn-Beta has show…
Abstract A new‐doped method based on electrochemical polymerization of aniline in the presence of ferrocene perchlorate and perchloric acid was presented. Polyanilines (PAn and PAnFc) were polymerized in the solution of perchloric acid and the solution containing ferrocene perchlorate and perchloric acid, respectively…
Abstract In this work, microstrip lines loaded with complementary split rings resonators (CSRRs) and series capacitive gaps are modeled by means of a lumped element equivalent circuit. The structures exhibit a left‐handed (or backward wave) behavior at low frequencies, followed by forward transmission at higher freque…
Abstract We want to clarify a few issues about using optical absorption spectra for characterizing carbon nanotubes. The common method of using optical density for nanotube counting is reasonable in the near‐infrared and visible spectral region, but fails for the mid and far infrared, where metallic tubes can be unamb…
Abstract Dynamically cured thermoplastic elastomers or thermoplastic vulcanizates (TPVs) are widely used nowadays for their unique characteristics. In this paper, gas phase ethylene–propylene–diene terpolymer (GEPDM)/Polypropylene (PP) TPVs with various crosslinking systems have been extensively studied to optimize th…
Abstract The damping properties in blends of poly(styrene‐ b ‐isoprene‐ b ‐styrene) (SIS) and hydrogenated aromatic hydrocarbon (C 9 ) resin were investigated by dynamic mechanical analysis. SIS exhibited two independent peaks of loss factor (tan δ) corresponding to the glass transition of polyisoprene (PI) and polyst…
Abstract This paper presents the use of statistical analysis for studying the responses of two continuous devulcanization processes (of the EPDM roofing sheet and the EPDM profile) in the extruder. The response is represented by the reaction conversion, which is denoted as the relative decrease in crosslink density. E…
Abstract Improvements in physical, mechanical, and thermal properties of an epoxy network are made with the use of a unique class of molecules that reinforce the network at the molecular scale. These molecules are commonly referred to as antiplasticizers or fortifiers. In this contribution, two types of fortifiers are…
We have investigated the crystalline structure and the magnetic properties of La 1- x Pr x CoO 3 single crystals. The crystalline symmetry is rhombohedral R \bar3 c for 0 ≤ x ≤0.3, and orthorhombic P n m a for 0.7 ≤ x ≤1. The lattice volume decreases monotonically with increasing Pr content due to the smaller ionic ra…
Abstract Vinyl trimethoxysilane (VTMS) was grafted onto metallocene‐based polyethylene–octene elastomer (POE) using a free‐radical reaction of VTMS and dicumyl peroxide as an initiator, and then the grafted POE was crosslinked in the presence of water. The effects of VTMS concentration on crystallization behavior, mec…
Abstract Taguchi method is applied in this study to determine the optimum level of curing system (sulfur, MBTS, and CBS) in a NBR/PVC blend. By considering physicomechanical properties of cured NBR/PVC blend, optimum level of curing system is determined. A fixed master batch formulation of NBR/PVC is used, and the eff…