Microphase separation, stress relaxation, and creep behavior of polyurethane nanocomposites

Creep and Stress Relaxation Behavior of Polypropylene, Metallocene-Prepared Polyethylene and their Blends

Microphase Separation and Rheological Properties of Polyurethane Melts. 1. Effect of Block Length

A series of polyesterurethanes with differing block length and constant composition have been synthesized for rheological studies. Hard segments based on isophorone diisocyanate and 1,4butanediol and soft segments based on polycaprolactone to ensure high thermal stability and to prevent high melting point crystallinity enabled long-duration rheological characterization at high temperatures. DSC...

The Effect of Polyethylene Glycol and Nanoclay on the Rheological Behavior of Dispersing Cationic Polyurethane Nanocomposites

Cationic waterborne polyurethane as a new dispersing polymer was synthesized by using relatively hydrophilic polyols. Dispersing cationic polyurethane (DCPU) nanocomposites were prepared using isophorone diisocyanate (IPDI), polyethylene glycol (PEG) with different molecular weights (Mn=200, 400, 600,and1000 g/mol), N-methyl diethanolamine (MDEA), dibutyltin dilaurate (DBTDL) and different perc...

Stress-Strain Behavior of Thermoplastic Polyurethane

The large strain nonlinear stress-strain behavior of thermoplastic polyurethanes (TPUs) exhibits strong hysteresis, rate dependence and softening. Thermoplastic polyurethanes are copolymers composed of hard and soft segments. The hard and soft segments phase separate to form a microstructure of hard and soft domains typically on a length scale of a few tens of nanometers. Studies have revealed ...

Review Polyurethane Nanocomposites

This review describes the present state of science and technology of photopolymerizable (UV-curable) polyurethane (PU) nanocomposites which include nanosilica and organically-modified clay (organoclay). A number of documented improvements of properties of PU nanocomposites compared to the pristine PU are presented. Many data on the structure and properties of PU nanocomposites were obtained not...