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Organic-inorganic nanocomposite films made from polyurethane dispersions and colloidal silica particles
被引:16
作者:
Serkis, Magdalena
[1
]
Spirkova, Milena
[1
]
Kredatusova, Jana
[2
]
Hodan, Jiri
[2
]
Bures, Radovan
[3
]
机构:
[1] Inst Macromol Chem AS CR, Nanostruct Polymers & Composites Dept, Prague, Czech Republic
[2] Inst Macromol Chem AS CR, Polymer Proc Dept, Prague, Czech Republic
[3] Slovak Acad Sci, Informat Comp & Appl Math Dept, Inst Mat Res, Kosice, Slovakia
关键词:
Polyurethane dispersion;
colloidal silica;
composites;
morphology;
mechanical properties;
MOLECULAR-WEIGHT;
POLYCARBONATE;
MACRODIOL;
D O I:
10.1080/09276440.2016.1124666
中图分类号:
TB33 [复合材料];
学科分类号:
摘要:
Polyurethane/silica nanocomposites were prepared by solution blending of polyurethane water dispersion (PUD) based on polycarbonate macrodiol with colloidal silica aqueous sol LUDOX TMA. Because of mixing PUDs made from linear polyurethane with the nanofiller, only physical polymer/filler type of interface formed by hydrogen bonds was obtained. As a result the materials were possible to reuse after dissolution in acetone followed by dispersion in water. The effect of colloidal silica content on mechanical, thermal, morphological, and swelling properties of obtained films was tested by tensile test, dynamic mechanical thermal analysis, thermogravimertic analysis, scanning electron microscopy, atomic force microscopy, and swelling analyses. The nanocomposites were classified in three groups differing in the internal structure and functional properties: organic matrix filled with inorganic nanofiller (up to 10 wt% of silica), bicontinous systems (25 and 32 wt% of silica) and inorganic matrix filled with polyurethane (50 and 60 wt% of silica). Only small amount of colloidal silica (up to 10 wt%) improves thermo-mechanical properties, smoothes the materials, and suppresses extent of swelling without changing of the films transparency.
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页码:157 / 173
页数:17
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