graft copolymerization of vinyl monomers on modified cottons - 18. grafting of methyl methacrylate and acrylonitrile on cotton treated with n-methylol crosslinking agents using tetravalent cerium as initiator

in the reported experiments, ce**i**v-induced grafting of methyl methacrylate and acrylonitrile on cotton fibers crosslinked with dimethylol ethylene urea, dimethylol dihydroxyethylene urea, and dimethylol carbamate was investigated. the graft yields obtained with crosslinked cotton were significantly lower than the untreated cotton, irre..

polymers for fibers and elastomers, based on a symposium at the meeting of the american chemical society, 186th, 1983

this conference proceedings contains 26 papers. the session consider: fiber characterization; instrumental methods; high-performance polymers; elastomers; processability; carbon filters; fiber formation/modification; and fiber technology various papers discuss: deformation profiles; viscoelastic properties; spun yarn morphology; surface c..

discriminating between unwashed and washed cotton fibers

the washing of cotton prior to processing has been shown to reduce lung dysfunction associated with byssinosis in mill workers the present study used thermal methods of analysis (differential scanning calorimetry and thermogravimetric analysis), contact angle, a sink-float method, potassium content and chemiluminescence as methods objecti..

thermal entrainment and human ovulation

the changes in the peripheral vascular response to temperature have been studied for ten menstrual cycles by calculating thermal entrainment levels. the entrainment levels exhibited peaks at around the time of ovulation, a result which we believe is due to the fluctuating levels of the hormones estrogen and progesterone in the blood. an a..

technique for measuring the oxygen index of fibrous and powdered cellulose derivatives

a technique to assess the flame resistance of small quantities of fibrous or powdered derivatives of cotton cellulose was developed the procedure is an adaptation of the oxygen index (oi) fabric flammability test. cellulose fibers or powders were pressed into 0 5-g discs, 1 1/4 in. in diameter which were used to measure the oi's in the in..

scanning electron microscope study of calcium oxalate crystals in cotton plants and cotton-related dusts

scanning electron microscopy and energy dispersive x-ray analysis were used to show the presence of crystals believed to be calcium oxalate in leaf and bract tissues of cotton plants. the crystals were present in both fresh and dried materials. in the dry leaves and bracts the crystals were often found crushed. several forms of the crysta..

gehaeuse- und leiterplattentechnologie von lsi-/vlsi-schaltkreisen. $left bracket$ housing and printed-circuit technology of lsi and vlsi circuits $right bracket$

problems associated with the design of adequate housing for integrated circuits are discussed. these problems have become acute in view of the ever-growing functional density of ics. the dual-in-line (dil) housing configuration, the so-called dip, with a pin separation of 1 in. is a dominant factor. the effects on printed-circuit boards a..

leiterplatten - marktlage und tendenzen. $left bracket$ printed circuit boards $right bracket$

this paper is presented in five parts. the first part deals with the marketing situation and development trends. the other parts are: 'from circuit-board design to original film', 'circuit-board base materials and their mechanical handling', 'circuit-board production by subtractive processes' and 'semi-additive and fully additive techniqu..

le soudage sous l'eau et dans la zone de marnage - vue d'ensemble. $left bracket$ welding under water and in the tidal zone a review $right bracket$

the paper presents a review of the parameters controlling underwater welding, especially arc welding with covered electrodes, mig, tig, and with cored wire. it describes wet welding and hyperbaric welding, with the use of nitrogen and noble gases for shielding and in the welding chamber. the specific problems of underwater welding are des..

crystallization of amorphous cellulose

recrystallization behavior of the hydrolysates of native and thrice mercerized cotton, ball-milled to yield samples of different amorphity, was studied using x-ray diffraction. for crystallization of amorphous cellulose into cellulose i lattice, the presence of cellulose i nuclei seems to be a prerequisite. in a partially ball-milled cell..