期刊
MACROMOLECULES
卷 48, 期 15, 页码 5378-5384出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.macromol.5b01210
关键词
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资金
- Institute for Collaborative Biotechnologies from U.S. Army Research Office [W911NF-09-0001]
- MRSEC Program of the NSF [DMR 1121053]
- NSF
- E.I. DuPont de Nemours Co.
- Dow Chemical Company
- Northwestern University
- U.S. DOE [DE-AC02-06CH11357]
A new thermodynamically stable, aperiodic bricks-and-mortar (B&M) cellular mesophase structure is reported in PS1-b-(PI-b-PS2)(3) miktoarm copolymer and PS homopolymer blends [PSI, long polystyrene; PI, poly(isoprene); PS2, short polystyrene], where PS comprises discrete hard bricks and PI the continuous soft mortar. The mesophase is unique in its extreme domain volume fractions, its lack of positional order, and quasi-long-range orientational order. On the basis of this unusual mesophase structure, a series of PS-based thermoplastic elastomers are realized, combining rigidity from an exceptionally high content of discrete glassy PS domains (up to 82 wt %) and high extensibility with recoverable elasticity from a low content of continuous rubbery PI (down to 18 wt %). The new elastomers show sharp yielding behavior while maintaining good elasticity at large strains. Tensile-SAXS experiments reveal that voiding plays an important role for the mechanical behavior and voids can open/dose reversibly with/without loading. Plastic deformation only results in a slight loss of recoverable elasticity.
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