Preparation and Physical Properties of MDEA-based Polyurethane Cationomers and their Application to Textile Coatings

Abstract

Cationic aqueous polyurethane (CAPU) coatings were prepared by the acetone process using 4,4-methylene bis (isocyantocyclohexane) (H12MDI), N-methyldiethyolamine (N-MDEA) and a series of various polydiols (polyethylene glycol (PEG), polypropylene glycol (PPG) and polytetramethylene glycol (PTMG) for ether-type polyols and polycaprolactone (PCL) for ester-type polyol) with different molecular weights (Mn =1000, 2000 and 3000 g/mole). The surface tension of CAPU dispersion, contact angle, thermal properties of CAPU casting film and its tensile strength were examined. The waterproof (WP) and water vapor permeability (WVP) of coated fabric and its washing durability were also studied. Our results showed the ether-based CAPU showed a higher surface tension value, contact angle and WVP with a sequence of PEG-PU > PTMG-PU > PPG-PU > PCL-PU, and it increased with increasing M n of the soft segment. As for the thermal properties, the PEG-PU had the highest glass transition temperatures of the soft segment (Tgs) and melting point (Tms) than those of PCL -PU, PTMG-PU and PPG-PU. For the thermal stability of CAPUs casting film, the PEG-PU had ideal thermal stability, followed by PTMG-PU and PCL -PU, and the CAPU with a larger M n of the soft segment had better thermal stability. The PTMG-PU had excellent tensile strength, followed by PCL -PU and PPG-PU. For coated fabric, the trend of WVP followed the order: PEG-PU > PTMG-PU > PPG-PU > PCL -PU, while the WP followed the order: PTMG-PU > PCLPU > PPG-PU > PEG-PU. Finally, the CAPUcoated fabric had an excellent performance after washing and its wash-durability was still 80 %.

Synthesis and characterization of multiwall carbon nanotube/waterborne polyurethane nanocomposites

“…for the thermal behaviour of polyurethane based on different polyols with various molecular weights. It is expected that polyurethane with PCL as soft segment would show melting and crystallization peaks in DSC curve but results indicate that PCL‐based polyurethane does not show any exothermic or exothermic peak for a molecular weight of 2000 g mol −1 …”

Acoustic Characteristics Parameters of Polyurethane/Rice Husk Composites

“…PU is widely used in the fields of sound absorption, heat insulation, food industry, medical field, conference rooms, concert halls, stadiums, automotive interior parts, etc. . At present, adding various reinforcing particles in PU porous materials is an important method on improving the acoustic properties.…”

“…Measurement of sound velocity in impedance tube (where, the three points P 1 ,P 2 ,P 3 correspond to the horizontal axis X 1 ,X 2 , and X 3 . The sound pressures p 1 and p 2 that measured at the points P 1 and P 2 , is dominant in the estimation of the components of the echo and the incident wave, and can be used to deduce the theoretical sound pressure value of pointp3 ). [Color figure can be viewed at wileyonlinelibrary.com]…”

Influences of the Preparation Temperature on the Acoustic Parameters of Polyurethane

“…It used extensively in transportation, construction, machinery, electronic equipment, furniture, textile, petrochemical, water conservancy, national defense, medical and other fields [1][2] [3][4] [5] . And now widely used as sound absorbing material to achieve the purpose of noise reduction.…”