Viscoelastic Stress Relaxation Profiles in Heat Set Polyurethane Stretch Wovens
Controlled stenter dwell at 185-195°C stabilizes polyurethane hard segments to minimize viscoelastic force decay and garment bagging in stretch wovens.
Polyether Polyol
Chemical Precursor
Organic compound contains multiple hydroxyl groups and ether linkages within its molecular structure. Polyether polyol operates as a primary liquid reactant in the synthesis of polyurethane coatings, foams, and elastomers. This reactive chemical determines the flexibility and softness of the resulting polymer film on the fabric surface.
Moisture Resistance
Polyurethane coatings can be formulated using either polyester or polyether backbones. The use of polyether polyol gives the resulting fabric coating superior resistance to hydrolysis and microbial degradation under warm, humid conditions. This chemical resilience makes polyether-based polyurethanes the preferred choice for outdoor apparel, rainwear, and military gear that must withstand continuous exposure to damp environments.
Synthetic leathers produced with this polymer maintain their integrity without cracking or peeling over long storage periods.
Coating Performance
Low-temperature flexibility represents another physical benefit of using this specific ether-based chemistry. The molecular mobility of the polyether polyol chains allows the coated fabric to remain supple and crack-resistant in freezing climates. This performance trait is critical for protective sportswear and industrial tarpaulins.
Processing Sequence
Formulating polyurethane resins requires balancing the molecular weight of the raw ingredients to control viscosity. Using a high molecular weight polyether polyol produces a soft, flexible coating but requires longer curing times on the stenter frame. Chemical engineers adjust these ratios to optimize both production speed and fabric hand feel.