Sequence Structure,Morphology and Viscosity Behavior of 3,3‐bis(azidomethyl) Oxetane‐tetrahydrofuran Random Copolyether

In order to reveal the relationship between 3,3‐bis(azidomethyl) oxetane‐tetrahydrofuran copolyether (P(BAMO‐THF)) microstructure and its macro properties, the segment sequence structure of a kind of P(BAMO‐THF) was characterized using quantitative ¹³C‐NMR analysis. It was found that the P(BAMO‐THF) is composed of equimolar comonomers whose randomness factor (R) is 1.09, belonging to a quasi‐ideal random copolymer. Combining DSC and polarizing optical microscopy, it was verified that the thermal‐effect between 28 °C and 41 °C attributes to the melting of the P(BAMO‐THF)spherulites. Using WAXRD, it was suggested that the aggregation of BAMO micro‐blocks among P(BAMO‐THF) polymeric chains causes the formation of spherulites. The viscosity measurement clearly demonstrated that, below 30 °C or above 40 °C, the P(BAMO‐THF) viscosities change slowly as a function of temperature. Conversely, between 30 °C and 40 °C, its viscosities sharply decline with the increase in temperature because of the changes in its morphology.