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Segmented polyurethanes (SPUs) have been designed with controlled hard to soft segment ratios.
These results were interpreted in terms of soft segment-hard segment phase separation and soft segment crystallization.
The restriction of the crystallization of the PCL soft segment depends on the hard segment concentration, length of the soft segment, and total molecular weight of the PEUs.
Hard segment, soft segment and chain extender were varied, while keeping the hard segment fraction at ca 40% and soft segment molar mass at 2000 g/mol.
The microphase-separated morphology of the polyurethane with higher soft segment content consisted of hard segment domains dispersed in a soft segment matrix.
Tensile analysis revealed strain-induced crystallization for ionenes with a 2 kg/mol PTMO soft segment and increased stress at break with increasing soft segment molecular weight.
Waterborne polyurethanes have been designed and synthesized based on different types of soft segment, viz.
Biodegradable polyurethane (PU) was synthesized based on using poly(ɛ-caprolactone) (PCL) as the soft segment.
A second soft segment was included due to poly(ɛ-caprolactone) diol (PCL).
Similar(2)
The hard-segment Tg and the soft-segment Tm influence the conductivity behavior of polyelectrolytes with increasing measurement temperature.
This relaxation behaviour suggests the formation of an amorphous structure without separation into soft-segment and hard-segment phases.
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