Preparation and properties of cast polyurethane elastomers with molecularly uniform hard segments based on 2,4-toluene diisocyanate and 3,5-dimethyl-thioltoluenediamine

摘要: A series of three cast polyurethane elastomers were prepared from 2,4-toluene diisocyanate (TDI) and 3,5-dimethyl-thioltoluenediamine (D MTDA) chain extender, with polyethylene adi-pate (PEA), polyoxytetramethylene glycol (PTMG) polycaprolactone (PCL) soft seg-ments. The polyol molecular weights em-ployed was 2000g/mol. characterized by an elec-tronmechanical universal testing machine, Akron abrasion loss tester, a LX-A Shore du-rometer, rebound resilience equipment Dynamic- Mechanical analyzer. In addition, fractured surface the elas-tomers investigated field emission scanning electron microscopy (SEM). test results showed PCL based elastomer ex-hibits excellent tear stress-strain properties that polyester offer, while retaining superior compression set similar to polyether elas-tomers. static dynamic more suitable for applications. SEM micro-graphs all samples indicated existing microphase separation structure. Particles dispersed phase formed hard crystalline part grows bigger in-creasing crystallinity segments. domains are irregular shapes sizes few micrometers.