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Polytetrahydrofuran (PolyTHF): the Ideal Soft Segment for PUR |
PolyTHF is one of the main soft segments for thermoplastic elastomers and crosslinked elastomers.
The hard segment of thermoplastic elastomers generally consists of chain extenders such as short chain diols (e.g. 1,4- butanediol) and diamines (e.g. 1,2-propylenediamine). The amorphous soft segment (PolyTHF) not only imparts elasticity and low temperature flexibility to the finished product but influences the chemical behavior as well. Careful adjustment of the soft segment fine-tunes the desired properties of the final application.
BASF is the global market leader in PolyTHF production and manufactures a wide range of PolyTHF molecular weights, including the standard molecular weights 650, 1,000 and 2,000; as well as special 250, tech molecular weights.
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PolyTHF is the ideal soft segment for PUR with:
- excellent dynamic mechanical properties across a wide temperature range
- exceptional low temperature behavior
- superior hydrolytic stability
- high moisture vapor transmission
- excellent abrasion resistance
- high microbial resistance
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PolyTHF’s physical and chemical properties give it advantages over competitive materials such as polyester polyols, due in particular to its superior hydrolysis stability and microbial resistance.
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