The physical and/ or chemical changes of a material with respect to time, under defined environmental conditions, leading to improvement or deterioration of properties.
The ability of a polymer to withstand mechanical action, such as rubbing, scraping or erosion, which tends to remove material progressively from it's surface.
The tangential force on unit area of either of two parallel planes at unit distance apart when the space between the planes is filled with the fluid in question and one of the planes moves with unit differential velocity in its own plane. The C.G.S. unit for absolute (or dynamic) viscosity is poise (dyne-sec./sq. cm.). Centipoise (0.01) is often used.
Penetration of one material into the mass of another by molecular or chemical action.
An auxiliary ram used to provide fast delivery of plasticated melt. Used on injection of blow molding operations. A cylinder is filled with plasticated melt between shots by an extruder. This cylinder then stores the melt for the next shot. Mostly used for large pan molding. In injection molding, the accumulator is a nitrogen-filled bag inside a hydraulic cylinder and is used to produce higher injection speeds.
A diverse group of specialty chemicals incorporated into plastic formulations before or during processing, or to the surfaces of finished products after processing. Their primary purpose is to modify the behavior of plastics during processing or to impart useful properties to fabricated plastic articles. (Modern Plastics Encyclopedia 1995).
A coating which is applied to the substrate before it is extrusion coated with the plastic and which improves the adhesion of the plastic to the substrate.
A substance which applied as an intermediate is capable of holding materials together by surface attachment
A general term for monovalent aliphatic hydrocarbon radicals.
Composite material made up by blending polymers or copolymers with other polymers or elastomers under selected conditions, e.g., styrene-acrylonitryle copolymer resins blended with butadiene-acrylonitrile rubbers.
Having no crystallinity. At processing temperatures, most plastics are amorphous.
Closed strong vessel for conducting chemical reactions under high pressure; (2) in low-pressure laminating, a round or cylindrical container in which heat and gas pressure can be applied to resin-impregnated paper or fabric positioned in layers over a mold.
Rigid thermoplastic produced by the reaction of purified formaldehyde. Molecular structure is linear acetal with unbranched polyoxymethylene chains.
Adhesion of the molecules of one material to the surface of the solid or liquid with which they are in contact.
A synthetic resin formed by the polymerization of chemical compounds containing the group CH2=CH-CH2-. The principal commercial allyl resin is a casting material that yields allyl carbonate polymer.
