Study on the surface properties and thermal stability of polysiloxane-based polyurethane elastomers with aliphatic and aromatic diisocyanate structures
作者：Chang-An Xu,Mangeng Lu,Zhiyou Tan, Zhencai Qu,Kun Wu,Jun Shi
關鍵字：Polyurethane,Surface properties,Diisocyanate,Thermal stability, Polysiloxane
論文來源：期刊
具體來源：Colloid and Polymer Science
發表時間：2020年
A series of polysiloxane-based polyurethane elastomers with aliphatic and aromatic diisocyanate structures are prepared using a two-step polymerization method. First, tolylene diisocyanate (TDI); dicyclohexylmethane 4,4′-diisocyanate (H12MDI); and hexamethylene diisocyanate (HDI) separately react with polycarbonate diol (PCDL) to produce polyurethane prepolymer, and furthermore, polysiloxane (PDMS) is added to the system to produce different polymers. The effect of different diisocyanate structures on mechanical properties, thermal stability, surface topography, and hydrophobic properties are explored. The results show that when the mass loss is higher than 50% during thermal decomposition, TDIPU exhibits relatively excellent thermal stability, which may be caused by the exposure of the silicone inside the polymer. HDIPU shows high hydrophobicity and low surface free energy, which is mainly related to a large amount of Si enriched on the surface. These differences are mainly caused by different molecular structures.