They are thermoset elastomers, since they contain substituted urea linkages from PPDI chain extended with select types of diamines.
In this article, we will present the exceptional property retention of LF PPDI based thermoplastic urethane elastomers.
10%, conventional prepolymer may contain several percent free PPDI monomer or well over 10% free MDI monomer.
For the TPU made from low free PPDI prepolymers, the value of split tear remains higher than that of CPU counterparts at 130[degrees]C.
Due to the geometric symmetry of the structure in all three planes (figure 1), PPDI provides a linear, compact hard segment structure in a polymer system.
Presented here will be background to the product and technology and data illustrating the property enhancements PPDI brings to urethane systems.
As PPDI is a solid at room temperature, the finishing step of the process produces material in a free flowing flake form.
Table 1 compares the physical properties of PPDI in comparison to other diisocyanates.
Following the successful start-up of their PPDI business, Du Pont is soon expected to bring CHDI to market.
CHDI and PPDI - PPDI is back and CHDI is coming back.
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