期刊
ACS MACRO LETTERS
卷 7, 期 8, 页码 962-967出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmacrolett.8b00475
关键词
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资金
- National Research Foundation of Korea (NRF) [NRF-2018R1A2B6008319, 2015K2A9A2A18065964]
- Korea Institute of Science and Technology (KIST) [2E28070]
- Global Ph.D. Fellowship Program [NRF-2016H1A2A1907114]
- MSIT
- POSTECH
- UNIST Central Research Facilities
While incorporation of nanoparticles in a polymer matrix generally enhances the physical properties, effective control of the nanoparticle/polymer interface is often challenging. Here, we report a dramatic enhancement of the mechanical properties of polymer nanocomposites (PNCs) using a simple physical grafting method. The PNC consists of low molecular weight poly(ethylene glycol) (PEG) and silica nanoparticles whose surfaces are modified with dopamine modified PEG (DOPA-mPEG) brush polymers. With DOPA-mPEG grafting, the nanoparticle surface can be readily altered, and the shear modulus of the PNC is increased by a factor of 10(5) at an appropriate surface grafting density. The detailed microstructure and mechanical properties are examined with small-angle X-ray scattering (SAXS) and oscillatory rheometry experiments. The attractive interactions between particles induced by DOPA-mPEG grafting dramatically improve the mechanical properties of PNCs even in an unentangled polymer matrix, which shows a much higher shear modulus than that of a highly entangled polymer matrix.
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