Search results
Results from the WOW.Com Content Network
In order to qualify as a thermoplastic elastomer, a material must have these three essential characteristics: The ability to be stretched to moderate elongations and, upon the removal of stress, return to something close to its original shape; Processable as a melt at elevated temperature; Absence of significant creep
This interferes with crystallization and lowers the polymer's melting temperature. In general, such PET is known as PETG or PET-G (polyethylene terephthalate glycol-modified). It is a clear amorphous thermoplastic that can be injection-molded, sheet-extruded or extruded as filament for 3D printing .
Polyether block amide or PEBA is a thermoplastic elastomer (TPE). It is known under the tradename of PEBAX® and VESTAMID® E (Evonik Industries).It is a block copolymer obtained by polycondensation of a carboxylic acid polyamide (PA6, PA11, PA12) with an alcohol termination polyether (Polytetramethylene glycol PTMG), PEG).
Thermosets do not melt when heated, but typically decompose and do not reform upon cooling. Stress-strain graph of a thermoplastic material. Above its glass transition temperature and below its melting point, the physical properties of a thermoplastic change drastically without an associated phase change.
MFI Measuring device. The Melt Flow Index (MFI) is a measure of the ease of flow of the melt of a thermoplastic polymer.It is defined as the mass of polymer, in grams, flowing in ten minutes through a capillary of a specific diameter and length by a pressure applied via prescribed alternative gravimetric weights for alternative prescribed temperatures.
These materials can also be coextruded to yield a part with both rigid and soft components. Thermoforming: The thermoforming properties of TPV are similar to those of acrylonitrile butadiene styrene (ABS) rubber and exhibit good melt strength, which provides uniform and predictable sag characteristics during heating. When producing a sheet for ...
TPU is the right choice when flexibility at low temperatures and/or an abrasion resistant thermoplastic elastomer (TPE) is requested. Polyether-based TPU in cases where additional excellent hydrolysis and microbial resistance is required, as well as in cases where extreme low-temperature flexibility is important. Ester-based TPU in cases where ...
The onset of thermal degradation dictates the maximum temperature at which a polymer can be used. It is an important limitation in how the polymer is manufactured and processed. For instance, polymers become less viscous at higher temperatures which makes injection moulding easier and faster, but thermal degradation places a ceiling temperature ...