Rheological and mechanical properties of thermoplastic polyurethane elastomer derived from CO₂ copolymer diol

Abstract

CO2 copolymer diol‐based thermal polyurethane elastomers (PPC‐TPU) were prepared by the reaction of CO2 copolymer diol and methylene diphenyl diisocyanate and chain extender (ethylene glycol/1,4‐butanediol/1,6‐hexanediol) (EG/BDO/HG). The rheological and mechanical properties of PPC‐TPU were analyzed. The effects of shear rate, shear temperature, hard segment content, and variety of chain extender on the properties of PPC‐TPU were studied. The results showed that the apparent viscosity (η) of PPC‐TPU decreased with the increasing shear rate (τ), and the non‐Newtonian index (n) was less than 1. PPC‐TPU exhibited a typical character of pseudoplastic non‐Newtonian rheological behavior. The degradation during the processing was obviously inhibited by adding plasticizer and antioxidant. It was also discovered that the apparent viscosity varied with the content of hard segment and chain extender. Under the same temperature (185 °C) and shear rate (50 s−1), the apparent viscosity increased considerably with the raise of hard segment content, and the apparent viscosity and tensile strength of PPC‐TPU with EG as chain extender was the maximum. It can be seen that with the apparent shear rate increasing, the variation tendency of apparent shear stress levels off, and the nonlinear relationship of τ–γ curve tended to be obvious. PPC‐TPU exhibited a typical character of pseudoplastic non‐Newtonian rheological behavior. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45974.

Copper-Polyurethane Composite Materials: Particle Size Effect on the Physical-Chemical and Antibacterial Properties

“…The processing properties of the pristine polyurethane and copper-polyurethane composite were studied by monitoring the evolution of torque over time during mixing in a Haake rheometer ( Table 1 ). The evaluated samples show similar behavior in terms of the torque variation, where, within the processing time, the torque increases rapidly to the maximum and then decreases gradually until reaching the equilibrium value (steady state) associated with a typical non-Newtonian characteristic of polymer materials [ 17 , 18 ]. The value of the torque in the steady state was obtained from the torque vs. time curve ( Figure 1 ), and corresponds to the state of equilibrium [ 19 , 20 ].…”

Properties and degradation of castor oil-based fluoridated biopolyurethanes with different lengths of fluorinated segments

“…Subsequently, Fig. 4 shows the 1 H- 13 , indicating that MDI has reacted with the PCL, castor oil, and chain extender completely. Fig.…”

“…10,11 Thermoplastic polyurethane (PU) is a block copolymer that is oen synthesized with diol (so segment), diisocyanate (hard segment), and chain extenders. 12,13 The incompatibility between so and hard segments leads to microphase separation, and the level of microphase separation is closely related to the tensile strength of PU. 14,15 Studies have discussed factors causing microphase separation in PU, such as hydrogen bonds (HBs) 16,17 and the ratio of so and hard segments.…”

Preparation, characterization and properties of biodegradable poly(butylene adipate‐co‐butylene terephthalate)/thermoplastic poly(propylene carbonate) polyurethane blend films

“…According to research findings, PPCU had higher tensile strength and tearing strength than polypropylene glycol‐based TPU (PPG‐TPU). Compared with poly(butylene adipate) glycol‐based TPU (PBA‐TPU), PPC‐TPU exhibited excellent hydrolysis stability and lower crystallinity 19,20 . Furthermore, compared with PPC, PPCU has good mechanical properties with high impact strength and elongation at break.…”