Synthesis and characterization of polysulfone-containing poly(butylene terephthalate) segmented block copolymers

Joseph M. Dennis; Gregory B. Fahs; Robert B. Moore; S. Richard Turner; Timothy E. Long

doi:10.1021/ma501903h

Synthesis and characterization of polysulfone-containing poly(butylene terephthalate) segmented block copolymers

Joseph M. Dennis, Gregory B. Fahs, Robert B. Moore, S. Richard Turner, Timothy E. Long

Research output: Contribution to journal › Article › peer-review

20 Scopus citations

Abstract

A facile synthetic approach to segmented polysulfone-containing polyesters affords a versatile family of high-temperature thermoplastics with tunable thermomechanical properties. End-capping of phenol-terminated polysulfone (PSU) using ethylene carbonate generated telechelic oligomers with primary alcoholic functionality. Melt transesterification of dimethyl terephthalate and 1,4-butanediol in the presence of PSU oligomers yielded high molecular weight segmented block copolymers with alternating PSU and poly(butylene terephthalate) (PBT) sequences. Systematic variation in PSU incorporation resulted in tunable PBT segment length and accompanying thermal properties. DSC and SAXS elucidated a miscible, amorphous PSU and PBT phase, and PBT crystallinity remained below an 80 wt % incorporation of PSU. Dynamic mechanical analysis (DMA) revealed a crystallinity-dependent plateau regime above the copolymers glass transition temperature (T_g), while SAXS and WAXD confirmed a semicrystalline morphology below 80 wt % PSU. Incorporation of PSU segments significantly affected the crystallization and thermomechanical properties of PBT, and as a result these copolymers offer impact as chemically resistant, high-temperature thermoplastics due to their crystallinity, thermal stability, and high-temperature operating window.

Original language	English (US)
Pages (from-to)	8171-8177
Number of pages	7
Journal	Macromolecules
Volume	47
Issue number	23
DOIs	https://doi.org/10.1021/ma501903h
State	Published - Dec 9 2014
Externally published	Yes

ASJC Scopus subject areas

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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abstract = "A facile synthetic approach to segmented polysulfone-containing polyesters affords a versatile family of high-temperature thermoplastics with tunable thermomechanical properties. End-capping of phenol-terminated polysulfone (PSU) using ethylene carbonate generated telechelic oligomers with primary alcoholic functionality. Melt transesterification of dimethyl terephthalate and 1,4-butanediol in the presence of PSU oligomers yielded high molecular weight segmented block copolymers with alternating PSU and poly(butylene terephthalate) (PBT) sequences. Systematic variation in PSU incorporation resulted in tunable PBT segment length and accompanying thermal properties. DSC and SAXS elucidated a miscible, amorphous PSU and PBT phase, and PBT crystallinity remained below an 80 wt % incorporation of PSU. Dynamic mechanical analysis (DMA) revealed a crystallinity-dependent plateau regime above the copolymers glass transition temperature (Tg), while SAXS and WAXD confirmed a semicrystalline morphology below 80 wt % PSU. Incorporation of PSU segments significantly affected the crystallization and thermomechanical properties of PBT, and as a result these copolymers offer impact as chemically resistant, high-temperature thermoplastics due to their crystallinity, thermal stability, and high-temperature operating window.",

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AU - Long, Timothy E.

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Synthesis and characterization of polysulfone-containing poly(butylene terephthalate) segmented block copolymers

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