| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 830951 | Materials & Design (1980-2015) | 2012 | 5 Pages |
The polyurethane (PU)/SiO2 composites with diverse microstructure were obtained with different chain extension methods by pre-polymerization method. The composites with multitudinous crosslink density micro-domains were denoted as PUm/SiO2 composites, the other were denoted as PUh/SiO2 composites. The microstructure and the properties of PUm/SiO2 and PUh/SiO2 composites were investigated. The results showed that the particles of SiO2 were well-dispersed in PU matrix. It was demonstrated that the mechanical properties of PUm/SiO2 composites had optimal tear strength and maintained similar tensile strength in comparison with PUh/SiO2 composites. Scanning electron microscope (SEM) photographs indicated that the tensile sectional morphology of PUm/SiO2 composites was presented complex without rules, which verified that the PUm/SiO2 composites had better fracture toughness and strength. Differential scanning calorimetry (DSC) studies suggested a better micro-phase separation of soft and hard segments in PUm/SiO2 composites. Besides, the PUm/SiO2 composites had excellent solvent resistance performance.
► PU/SiO2 composites with multitudinous crosslink density have been prepared. ► The PUm/SiO2 composites are materials with great comprehensive properties. ► PUm/SiO2 composites had excellent solvent resistance performance. ► The dispersion of SiO2 in PU was investigated. ► The tensile sectional morphology of PUm/SiO2 was also investigated.
