quaternization of polypropylene grafted with 2n-morpholino ethyl methacrylate

a 2-n morpholino ethyl methacrylate (mema) grafted polypropylene fabric was quaternized with different alkylating agents including dimethyl sulphate, allyl bromide, ethyl iodide, 1-iodohexane. dimethyl sulphate was the most reactive as 100 reaction completion was attained and the produced quaternary ammonium fabric was hydrophilic in natu..

application of alumina fiber reinforced plastics as a grinding material

this work deals with the evaluation of ceramic fiber reinforced plastics as a grinding or polishing material. the plastics were manufactured by mixing continuous alumina fiber of definite diameters and thermosetting resin as a bond material. composites containing fibers of three different diameters ranging from 10 to 22 $mu$ m were used i..

estimation of thermal properties in epoxy matrix/carbon fiber composite materials

accurate knowledge of the thermal characteristics of composites is important in any nonisothermal environment, and these characteristics are related to the thermal properties of the material. the focus of this study is on the estimation of the thermal properties, namely thermal conductivity and volumetric heat capacity, of as4 surface tre..

molecular deformation and optomechanical behavior of glassy diacetylene-containing segmented block copolyurethanes

the mechanical and optomechanical behavior of glassy, diacetylene-containing, segmented copolyurethanes has been investigated. the polydiacetylene chains formed via solid-state cross-polymerization in the hard segment domains not only reinforce mechanically the copolymers at the molecular level but also confer on them optical properties s..

thermal stability of the shielding effectiveness of composites to electromagnetic interference. effects of matrix polymers and surface treatment of fillers

a series of composites was prepared using chatter-machined al and cu fillers, and various matrix polymers (nylon 12, ppo, pc, ps, abs and hdpe) to provide shielding materials for electromagnetic interference (emi). the thermal stability of the shielding function was examined by the changes in electrical conductivity and shielding effectiv..

effects of acid oxidation on wetting and adhesion properties of ultra-high modulus and molecular weight polyethylene (uhmwpe) fibers

the effects of acid oxidation on the surface properties of gel-spun ultra-high modulus and molecular weight polyethylene (uhmwpe) fibers were investigated. three acid-assisted reactions with cro//3 (i). k//2cr//2o//7 (ii), and one base-catalyzed reaction with k//2cr//2o//7 (iii) were studied. in reaction ii, two levels of sulfuric acid we..

integrated artificial heart-lung device

an integrated artificial heart-lung device (iahld) is being developed as a novel system for simultaneous long-term support of heart and lung. the iahld consists of an artificial lung component (lc) and two blood pumps. the lc is made with a special composite hollow fiber membrane that prevents serum leakage. the fibers are arranged as pil..

immobilization of destructor bacteria on artificial fibers for water treatment from anionic surfactants

the interaction of destructor bacteria (pseudomonas aeruginosa 1c, p. rathonis t, p. alcaligenes tr) of anionic surfactants with artificial fibers of different molecular structure is studied sorption kinetics and desorption of bacteria in the solutions of anionic surfactants (alkylsulfates, alkylsulfonates, alkylbenzenesulfonates) are asc..

structure of graft copolymers of polycaproamide with polymethacrylic acid

electron microscopy and electron-probe microanalysis, contrasting and etching have been used to investigate the structure of graft copolymers of pa-6 with polymethacrylic acid obtained by chemically initiated liquid phase graft polymerization. the authors have determined the concentration distribution profiles of the grafted polymer over ..

modeling of hollow-fiber capillary reactor for the production of l-alanine with coenzyme regeneration

continuous production of l-alanine with conjugated enzyme systems of alanine dehydrogenase (aladh) and lactate dehydrogenase (ldh) or alcohol dehydrogenase (adh) was carried out with nad regeneration in an ultrafiltration hollow-fiber capillary reactor (hfcr) which was proposed as a test bioreactor with very small scale in the aladh/ldh s..