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Sequence Structure, Morphology and Viscosity Behavior of 3,3‐bis(azidomethyl) Oxetane‐tetrahydrofuran Random Copolyether
Author(s) -
Zhai Jinxian,
Jia Honghui,
Guo Xiaoyan
Publication year - 2017
Publication title -
propellants, explosives, pyrotechnics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.56
H-Index - 65
eISSN - 1521-4087
pISSN - 0721-3115
DOI - 10.1002/prep.201700027
Subject(s) - tetrahydrofuran , oxetane , copolymer , morphology (biology) , viscosity , polymer chemistry , materials science , microstructure , rheology , crystallography , chemistry , organic chemistry , polymer , composite material , solvent , biology , genetics
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 13 C‐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.