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Characterization of block copolymers based on poly[3,3‐bis(ethoxymethyl)oxetane] and other novel polyethers
Author(s) -
Hardenstine K. E.,
Murphy C. J.,
Jones R. B.,
Sperling L. H.,
Manser G. E.
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300522
Subject(s) - copolymer , oxetane , crystallinity , materials science , polymer chemistry , glass transition , tetrahydrofuran , crystallization , dynamic mechanical analysis , polymer , composite material , chemistry , organic chemistry , solvent
Diblock, triblock, and alternating block copolymers based on poly[3,3‐bis(ethoxymethyl) oxetane] [poly(BEMO)] and a random copolymer center block poly(BMMO‐co‐THF) composed of poly[3,3‐bis(methoxymethyl)oxetane] [poly(BMMO)], and poly(tetrahydrofuran) [poly(THF)] were synthesized and characterized with respect to molecular weight. Glass transition temperatures T g and melting temperatures T m were characterized via DSC, modulus–temperature, and dynamic mechanical spectroscopy (DMS). These polyethers had T m between 70°C and 90°C, and T g between −55°C and −30°C. The degree of crystallinity of poly(BEMO) was found to be 65% by X‐ray powder diffraction. Tensile properties of the triblock copolymer, poly(BEMO‐block‐BMMO‐co‐THF‐block‐BEMO) were also studied. A yield point was found at 4.1 × 10 7 dyn/cm 2 and 10% elongation and failure at 3.8 × 10 7 dyn/cm 2 and 760 % elongation. Morphological features were examined by reflected light microscopy and the kinetics of crystallization were studied. Poly(BEMO) and its block copolymers were found to form spherulites of 2–10 μm in diameter. Crystallization was complete after 2–5 min.