Investigation of polyurethane (urea)/modified nano‐calcium carbonate hybrid aqueous dispersions and their films

Abstract

This investigation was focused on properties of polyurethane (urea) (PUU) by incorporating silica sol-modified nano-calcium carbonate (CaCO 3 ). The FT-IR spectroscopy and f potential measurement indicated the presence of a hybrid effect due to the hydrogen bonding between the nano particles and the polymer matrix. For these hybrid aqueous dispersions, the particle size decreased as the modified nano-CaCO 3 content increased, and the polydispersity index was very narrow (<1.20). Films prepared with the hybrid PUU aqueous dispersions exhibited excellent waterproof performance: the amount of water absorption was as low as 9.0 wt %, and the contact angle of water on the surface of this kind of film was as high as 93 C. TGA results indicated the high thermal stability of hybrid PUU polymers (223-255 C). The properties like tensile strength, hardness, and elongation at break were influenced by the modified nano-CaCO 3 content in the polymers. The hybrid PUU with 15 wt % modified nano-CaCO 3 content showed the optimum properties.

Effect of fillers on the microphase separation in polyurethane composites: A review

“…CaCO 3 has the advantages of wide distribution in nature, simple preparation methods, and biocompatibility 51–53 . PU/nano‐CaCO 3 composites have good mechanical properties, thermal stability, and shape memory behavior; adding CaCO 3 can also reduce the cost of composites 21,52–54 …”

“…In the study of Yang et al, 53 M‐CaCO 3 (nano‐CaCO 3 modified by nano‐SiO 2 particles enriched surface OH) was dispersed homogeneously in PU matrix by in situ dispersing method. FTIR spectra showed that the amount of hydrogen‐bonded CO and hydrogen‐bonded NH increased.…”

“…CaCO 3 has the advantages of wide distribution in nature, simple preparation methods, and biocompatibility. [51][52][53] PU/nano-CaCO 3 composites have good mechanical properties, thermal stability, and shape memory behavior; adding CaCO 3 can also reduce the cost of composites. 21,[52][53][54] In the study of Gao et al, 55 poly(propylene glycol) phosphate ester treated nano-CaCO 3 (PPG-P-CaCO 3 ) was obtained.…”

“…[51][52][53] PU/nano-CaCO 3 composites have good mechanical properties, thermal stability, and shape memory behavior; adding CaCO 3 can also reduce the cost of composites. 21,[52][53][54] In the study of Gao et al, 55 poly(propylene glycol) phosphate ester treated nano-CaCO 3 (PPG-P-CaCO 3 ) was obtained. Compared with pristine CaCO 3 , surface-treated CaCO 3 had lower surface energy; the compatibility between PPG-P-CaCO 3 particles and low polarity chains of SSs was improved.…”

“…Small particles have a greater effect on the microstructure of PU; 3. CaCO 3 may interact with HSs or SSs, which is affected by its polarity Donate-Robles and Martín-Martínez 56 Yang et al 53 Hydrogen-bonded C O and hydrogenbonded N H increased (FTIR) Vrsaljko et al 22 1. Nano-CaCO 3 had higher specific surface area and surface free energy; 2.…”