what is mechanical bonding in non woven technology?
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no stiching now!\nwelding\npolymer compunds\nglues\nadhesives\ncements
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Because it is nonpolar
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My understanding is that the shear stretches the molecules out, allowing more interactive sites to be exposed.  In a linear form, the molecule becomes more able to participate in bonding with its neighbor.
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Look into a product called Alumaloy. It's like welding that you can do with an ordinary propane torch. They claim its stronger than steel and will bond to any kind of metal.
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Do you see any high performance airplanes  or centrifuge rotors made of plastic instead of titanium?  I think you just answered your question. . .\n\nThat is a little glib, because tensile strength is only one mechnaical property (specific strength, hardness, etc). Stiffness is another reason titantium is popular.  Pure titanium has tensile strengths from 250 to 750 MPa. Ti alloys go up to 1250 MPa. \n\nIf you really only care about tensile strength in **one direction** then there are materials. Heat treatment of carbon fibers can generate tensile strengths as high as 5650 MPa.  Such fibers can be part of a plastic composite and nearly all of them will be less dense than titanium. Molecular weight is ill defined in such compounds and probably not what you meant.
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Mechanical engineering
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Nanotechnology, currently, mostly has to do with materials science, via creating micro structures that can withstand extreme stresses in either longitudal (carbon nano-tubes) or rotational (bucky-balls) directions, and any connection to aerospace is merely a coincidental imagining of people who are dreaming up ways to use these new exotic materials for aerospace applications.  Nanotechnology, in essesnce, is 'building' materials (metals, plastics, polycarbonates) from the basic atomic/molecular structure up.\n\nCurrently the only applications that I have heard of are in relation to a surface to low earth orbit(LEO)'elevator' which would be used to hoist payloads from the surface to LEO.  This setup would be extremely fragile though and tend to break even with the current nano-materials available.  \n\nThe other area where it would be of interest and much more probably of use, is in the area of heat resistant applications such at heat shields for re-entering spacecraft.  Nano-materials can be engineered to be highly resistant to high temperatures without their material properties changing drastically.  This would be a far greater useablility than any sort of space elevator.
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You might be able to contact Akron Coating and Adhesives.  They have announced its new line of hot melt adhesives designed to provide a strong bond between a variety of metals and thermoplastics such as AES’s Santoprene ™. Thermoplastic\nhttp://www.akroncoating.com/products/Detail.aspx?id=28\n\nOr choose from this list of manufacturers, distributors and service companies : http://www.thomasnet.com/products/adhesive-coating-services-392464-1.html
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Nonpolar bonds in sugars and starch
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Both the ASTM and ASME have standards for suitable gasket materials.  These include soft materials and metals formulations that have been tested.  Some processes do not allow any gaskets and must be designed with gasket free systems.\nSee the references below:
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I suggest you put a message on "Engineering Tips" www.eng-tips you will need to register and go to the engineering area suited to your question. I guess it will be Mechanical
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Adhesive, a substance used to bond two or more surfaces together. Most adhesives form a bond by filling in the minute pits and fissures normally present even in very smooth surfaces. Adhesive bonds are economical, distribute the stress at the bonding point, resist moisture and corrosion, and eliminate the need for rivets and bolts. The effectiveness of an adhesive depends on several factors, including resistance to slippage and shrinkage, malleability, cohesive strength, and surface tension, which determines how far the adhesive penetrates the tiny depressions in the bonding surfaces. Adhesives vary with the purpose for which they are intended. Such purposes now include the increasing use of adhesives in surgery.\n\nNatural adhesives have been replaced in many uses by synthetics; but animal glues, starches, gums, cellulose, bitumens, and natural rubber cements continue to be used in large volumes.\n\nOrganic adhesives derived from animal protein include glues made from collagen, a constituent of the connective tissues and bones of mammals and fish; blood albumin glue, used in the plywood industry; and glue made from casein, a protein constituent of milk, employed in wood bonding and in paint.\n\nVegetable adhesives include starches and dextrins derived from corn, wheat, potatoes, and rice, used for bonding paper, wood, and textiles; gums such as gum arabic, agar, and algin, which when moistened provide adhesion in such products as stamps and gummed envelopes; cellulose adhesives, used to bond leather, cloth, and paper; rubber cements; and resins such as tree pitch and mastic.\n\nSynthetic adhesives, used either alone or as modifiers of natural adhesives, perform better and have a greater range of application than the natural products. Most of them form polymers, huge molecules incorporating large numbers of simple molecules to form strong chains and nets that link surfaces in a firm bond. Thermosetting adhesives, which are transformed into tough, heat-resistant solids by the addition of a catalyst or the application of heat, are used in such structural functions as bonding metallic parts of aircraft and space vehicles. Thermoplastic resins, which can be softened by heating, are used for bonding wood, glass, rubber, metal, and paper products. Elastomeric adhesives, such as synthetic or natural rubber cements, are used for bonding flexible materials to rigid materials.
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Metallic bonding is the bonding within metals. It involves the delocalized sharing of free electrons between a lattice of metal atoms. Thus, metallic bonds may be compared to molten salts.\n\ne.g. Iron (Fe)... Why is it so strong? Of course, metallic bonding.\n\nMetal atoms typically contain a small amount of electrons in their valence shell compared to their period or energy level. These become delocalised and form a Sea of Electrons surrounding a giant lattice of positive ions.\n\nMetals seem to have higher boiling and melting points which might suggest stronger bonds between the atoms.\n\nMetallic bonding, as with covalent bonding is non-polar, in that there is no (for pure elemental metals) or very little (for alloys) electronegativity difference among the atoms participating in the bonding interaction, and the electrons involved in that interaction are delocalized across the crystalline structure of the metal.\n\nThe metallic bond accounts for many physical characteristics of metals, such as strength, malleability, ductility, conduction of heat and electricity, and luster. See also chemical bond.\n\nMetallic bonding is the electrostatic attraction between the metal atoms or ions and the delocalised electrons. This is why atoms or layers are allowed to slide past each other, resulting in the characteristic properties of malleability and ductility.\n\nMetallic bond are different from chemical bonds. Ionic and covalent bonds are chemical bonds.\n\nCovalent bonding is a common type of bonding, in which the electronegativity difference between the bonded atoms is small or non-existent. In the latter case, the bond is sometimes referred as purely covalent. See sigma bonds and pi bonds for current LCAO-explanation of non-polar bonds.\ne.g. CH4 (methane)\n\nIonic bonding is type of electrostatic bond between atoms which have an electronegativity difference of over 1.6 (this limit is a convention). These form in a solution between two ions after the excess of the solvent is removed.\ne.g. NaCl (common salt)\n\n<BEST ANSWER>\n============================================================\nHey, I tried to draw the structures of NaCl and methane molecules but this Yahoo! made it impossible. I hope you know the structurel.
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It's certainly used in the flexible packaging industry, but defined in several ways, including:\ntensile strength\npuncture resistance\nelongation at break\ntear resistance (in both directions)\ntear propagation resistance\nand many others . . .
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Sp2 non-polar covalent bond
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metals: give up electrons in ionic bonds. They also form metallic bonding.  sodium, potassium, lithium, to name just a few. There are a lot of metals\n\nnonmetals: this is more more difficult group to describe. They materials like to form covalent bonds--a joint sharing of two electrons. Both hydrogen and oxygen are nonmetals. But hydrogen gives up its electon in an ionic bond. For example HCl. It that repect it acts similar to a metal. Carbon is also a nonmetal\n\nMetaloid: silicon, germanium, boron, arsenic, antamony. These elements are right on the line between metals and nonmetals. As a result they make good semi conductors.
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here is something:\nwww.mmsconferencing.com/nanoc/\npdf/finalcircular.pdf\nand here is something else:\nNano-concrete is an example of a non-exotic material made better through nanotechnology and coming to market.  The ability to see and analyze material at the nano-scale means that concrete can now be  manufactured in such a way as to enable 3-inch thick highway bridge decks.  There are 150,000 obsolete bridges in the U.S. alone.  Nano-concrete can enable them to be rebuilt more cheaply and faster, and to be stronger and longer lasting.  The key impediment will be standard aversion to new ideas in the construction industry.\nanyway, google it for more info