期刊
ACS APPLIED MATERIALS & INTERFACES
卷 7, 期 27, 页码 14682-14689出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.5b02046
关键词
polymer nanocomposite; miscible blend; dynamic coupling; confinement; reversible stiffening; interphase adaptive
资金
- NSF-DMR CAREER [1048865]
- DOE Office of Science [DE-AC02-06CH11357]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1048865] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1538725] Funding Source: National Science Foundation
Miscible polymer blends with different glass transition temperatures (T-g) are known to create confined interphases between glassy and: mobile,chains. Here; we show that nanoparticles adsorbed with a high-T-g polymer, poly(methyl methacrylate), and dispersed in a low-T-g matrix polymer, poly(ethylene oxide), exhibit a liquid-to-solid transition at temperatures above T-g's of both polymers. The mechanical adaptivity of nanocomposites to temperature underlies the existence of dynamically asymmetric bound layers on nanoparticles and more importantly reveals their impact on macroscopic mechanical response of composites. The unusual reversible stiffening behavior sets these materials apart from conventional polymer composites that soften upon heating. The presented stiffening mechanism in polymer nanocomposites can be used in applications for flexible electronics or mechanically induced actuators responding to environmental changes like temperature or magnetic fields.
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