3M Corp

Five millimeter diameter disks of a porous polyethylene membrane, used as a window material in disposable FT-IR cards manufactured by 3M Corp. (Fisher Cat. 14385-861), were prepared by pre-wetting with 2 pi of methanol. A 1 pi aliquot of the aqueous protein solution was then added, and the membrane allowed to air dry at room temperature, before addition of 2 pi of matrix solution and final air drying. For those samples that were washed, after the protein solution had dried the membrane spot was vortexed in an aqueous 50% methanol solution for 30 seconds and air dried before addition of the matrix solution. 

M Corp. developed the Empore Strontium Rad Disks allowing the fixing of strontium by simple filtration of the water sample. No preconcentration step is required. Samples are acidified in 2-4 M nitric acid. Recoveries greater than 85 % have been observed for filtered volumes up to 3 These disks contain a strontium-selective crown ether extractant bonded to a solid silica support inserted in an inert PTFE matrix. ... 

M Corp. Minnesota Mining and Manufacturing Comp., St. Paul, USA. 

Acknowledgement The financial support from 3M Corp. for this study is gratefully acknowledged. 

FIGURE 17.24 (a) A conventional thin-film disposable ECG silver chloride electrode from 3M Corp. (b) A pure-silver EEG electrode from Teca Corp. (c) A pressed-pellet silver-silver chloride electrode from IVM Corp. 

Sample preparation Grind yew needles to <3 mm in a blender. Wei out 3-4 g, add 100 mL MeOH, shake for 16 h on a wrist-action shaker, filter (Whatman 1 or 2 paper), wash the solid with 25 mL MeOH. Evaporate the filtrate to dryness under reduced pressure at 40-43°, reconstitute the residue in 10 mL MeOH and 1 mL water. Condition a 47 mm Empore SPE extraction disk (3M Corp.) with 15 mL ethyl acetate, 15 mL MeOH and 15 mL water. Use a 47 mm polypropylene separator with 10 p.m pore size (Gelman 61757) in front of the extraction disk. Pass 10 mL water and 7 mL crude extract throu the disk, wash with 15 mL water, wash with 15 mL MeOH water 20 80,15 mL MeOHrwater 45 55, elute with 20 mL MeOH. water 80 20, filter (2 p,m) the eluate, inject a 10 p,L aliquot. 

Trademarks SafSl (ICI) Spectra 9000 (Allied Corp.) Nicalon (Nippon Carbon Co.) Kevlar (E.I. Dupont de Nemours) Nextel (3M Corp.) Thornel (Union Carbide). 

Ceramic slips approach Newtonian behaviour when completely deflocculated. (cf. bingham body dilatancy rheopexy thixotropy) Nextel. Trade-name. 3M Corp. Mullite fibres. 

In a procedure described in Ref. [474], sodium orthosilicate was added to the reaction medium to raise the polymer yield to 95%. The initiator was ammonium persulfate with a special emulsifier that is believed to be perfluorinated carboxylated emulsifier from 3M Corp [458]. Other initiators used are redox systems such as potassium persulfate-sodium metabisulfite or ammonium persulfate-sodium sulfite [475]. Different initiators are also of some interest because they affect the particle diameter of the emulsion. Polymer particles formed with a diameter between 0.36 and 18 pm, depending on the initiator system and the polymerization procedures, are reported [458]. In a patent of Dynamit Nobel [476], iodine-containing compounds such as ammonium iodide or isopropyl iodide are used. These compounds give rise to polymers of improved thermal stability and resistance to color deterioration. The procedure did not require the use of an emulsifier. After 150 min the internal pressure of the autoclave dropped from 2 x 10 to 3 X 10 Pa and a conversion to polymer of 86% was found. More recently Uschold [477] describes also an emulsion polymerization of PVF in high yields and having excellent color. 

While the performance of a dielectric elastomer transducer depends upon the dielectric and elastomeric properties of the polymer material, a great many polymer materials can be used. Because of this flexibility, unlike most other electroactive polymers (EAPs), different polymer materials can be selected for different applications, depending on the desired performance and physical properties. The best performing materials (those with greatest strains) are based on commercially available formulations of silicone rubber (polydimethyl siloxane) and acrylic elastomers such as the VHB series from 3M Corp. (Minnesota, USA) [11]. 

Dyneon USA/Germany PFA, FEP, ETFE Germany A wholly owned subsidiary of 3M Corp. 

Dyneon PFA Fluorothermoplastics, Dyneon Corp., Division of 3M Corp., www.dyneon.com, Minneapolis, MN, Apr. 2000. 

Table 14.3 contains data that compares the results of plasma treatment and sodium etching for four fluo-ropolymers. Peel strengths of untreated and treated samples were measured by bonding them into T-peel specimen using the flexibilized epoxy adhesive Scotch-Weld 3553 (available from 3M Corp.). The laminates were cured for several hours at 70°C and peel tested at 12.5 cm/min pull rate. Polytetrafluoroethylene does not accept plasma treatment as well as PEA and FEP, as indicated by its relatively low peel strength. Sodium etching is the only effective method of modifying the surface of PTFE. 

EMAWELD Ashland Specialty Chemical Co. Scotch-Weld 3M Corp. 

Nextel 720 oxide fibers, produced in tow form by 3M Corp. (Minneapolis, MN), were woven into 2-D 8 harness-satin cloth. The cloth was cut into a proper size, slurry-infiltrated with aluminosilicate (AS), and 0/90°, 12 ply-stacked followed by consolidation and sintering. No interface fiber coating was employed. The fiber volume fraction of the oxide/oxide composite panels thus fabricated (by GE) was about 0.45. Porosity was about 20-25 %. 

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