TY - JOUR
T1 - Synthesis of Polysulfone-Containing Poly(butylene terephthalate) Segmented Block Copolymers
T2 - Influence of Segment Length on Thermomechanical Performance
AU - Dennis, Joseph M.
AU - Fahs, Gregory B.
AU - Moon, Nicholas G.
AU - Mondschein, Ryan J.
AU - Moore, Robert B.
AU - Wilkes, Garth L.
AU - Long, Timothy Edward
PY - 2017/7/11
Y1 - 2017/7/11
N2 - A facile synthesis of hydroxyethyl-functionalized poly(ether sulfone) (PESu) oligomers permitted subsequent melt transesterification into segmented block copolymers with poly(butylene terephthalate). The unique solubility of the PESu oligomers in the melt with 1,4-butanediol and dimethyl terephthalate enabled a systematic study of segment length on thermomechanical properties of the resulting block copolymers. 1H NMR spectroscopy revealed a compositional dependence on the average segment length of the PBT. Additionally, the concert of NMR spectroscopy, DSC, and DMA highlighted critical segment lengths for crystallization and phase separation. In agreement with a relatively constant Tm and phase separation observed with DSC and DMA, respectively, small-angle X-ray scattering identified a compositionally independent lamellar thickness, while the amorphous layer thickness increased with PESu incorporation. As a result, the complementary analytical techniques provided an understanding of the morphological influence on the thermomechanical behavior of an unprecedented family of high-Tg, semicrystalline, segmented block copolymers.
AB - A facile synthesis of hydroxyethyl-functionalized poly(ether sulfone) (PESu) oligomers permitted subsequent melt transesterification into segmented block copolymers with poly(butylene terephthalate). The unique solubility of the PESu oligomers in the melt with 1,4-butanediol and dimethyl terephthalate enabled a systematic study of segment length on thermomechanical properties of the resulting block copolymers. 1H NMR spectroscopy revealed a compositional dependence on the average segment length of the PBT. Additionally, the concert of NMR spectroscopy, DSC, and DMA highlighted critical segment lengths for crystallization and phase separation. In agreement with a relatively constant Tm and phase separation observed with DSC and DMA, respectively, small-angle X-ray scattering identified a compositionally independent lamellar thickness, while the amorphous layer thickness increased with PESu incorporation. As a result, the complementary analytical techniques provided an understanding of the morphological influence on the thermomechanical behavior of an unprecedented family of high-Tg, semicrystalline, segmented block copolymers.
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U2 - 10.1021/acs.macromol.7b00557
DO - 10.1021/acs.macromol.7b00557
M3 - Article
AN - SCOPUS:85022334492
SN - 0024-9297
VL - 50
SP - 5107
EP - 5113
JO - Macromolecules
JF - Macromolecules
IS - 13
ER -