Details

Autor(en) / Beteiligte

• Seyidoglu, Tijen
• Bohn, Manfred A.

Titel

Effects of four isocyanates and four plasticizers on the thermomechanical and tensile properties of hydroxyl‐terminated polybutadiene elastomers and the effect of solid particle filling

Ist Teil von

• Journal of applied polymer science, 2021-05, Vol.138 (18), p.n/a

Ort / Verlag

Hoboken, USA: John Wiley & Sons, Inc

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Wiley-Blackwell Journals

Beschreibungen/Notizen

• The aim of this study is to analyze effect of four different isocyanates and four different plasticizers in hydroxyl‐terminated polybutadiene (HTPB) based elastomers by quantitative analysis of the shape of the loss factor (tan δ), tensile strength, deformation frequency shift of the maximum temperatures of loss moduli G" and of tan δ. The first part of the study shows intensities of the tan δ curves with the four isocyanates follow the order HDI > IPDI > H12MDI > Desmodur™ E305. By molecular modeling of the isocyanates and the corresponding polyurethane parts the influence of molecular geometry on tan δ are discussed. The second part of the study analyzes HTPB‐IPDI elastomers with the four different plasticizers DOA, DOS, DOZ, and IDP. The IDP provides lowest Tg at about −83°C, while the others provide at about −78°C. In the third part, aluminum (Al‐18 μm) and ammonium perchlorate (AP‐200 μm) are added to HTPB‐IPDI+DOA to analyze the effect of particle size, wt% content and particle type on the shape and intensity of the tan δ curves. From the frequency shift of the two maximum temperatures one receives activation energies Eaf. Their average values without and with plasticizer are with tan δ 178 and 165 kJ/mol and with G" 274 and 248 kJ/mol, respectively. A series of Hydroxyl Terminated Poly Butadiene (HTPB) based elastomer networks were prepared with four different isocyanates, four different plasticizers and with two different solid fillers, aluminium and ammonium perchlorate, to asses effect of each ingredient on the dynamic mechanical and glass transition properties of the final formulation.