To reach the properties of semicrystalline polymers, amorphous polymers would require molecular weights too high and, therefore, unreasonably high melt viscosity; the use of amorphous polymers in hot melt adhesives is usually only as modifiers.
12.
As the film is drawn upwards, it is cooled by a ring of air blowers so that the melt first becomes an amorphous viscoelastic solid, and then a semicrystalline solid, at what is known as the frost line.
13.
Viscoelastic materials, such as amorphous polymers, semicrystalline polymers, biopolymers and even the living tissue and cells, can be modeled in order to determine their stress and strain or force and displacement interactions as well as their temporal dependencies.
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Its initial goal was to develop a commercial " CRYSTAF " instrument . " "'CRYSTAF Crystallization Analysis Fractionation-" "'was a new patented technology developed by Dr . Monrabal at The Dow Chemical Company laboratories in the Netherlands to measure the Chemical composition Distribution in semicrystalline polymers.
15.
The coefficient " ? " varies with the temperature and some materials have a very high variation; see for example the variation vs . temperature of the volumetric coefficient for a semicrystalline polypropylene ( PP ) at different pressure, and the variation of the linear coefficient vs . temperature for some steel grades ( from bottom to top : ferritic stainless steel, martensitic stainless steel, carbon steel, duplex stainless steel, austenitic steel ).
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