Journal
STARCH-STARKE
Volume 69, Issue 11-12, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/star.201700088
Keywords
Compatibility; Modification extent; Montmorillonite; Nanocomposite
Categories
Funding
- National Natural Science Foundation of China [31371747]
- National Key Technology Support Program [2015BAD16B05]
- Innovation program of great agricultural and applied technology in Shandong province
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The mechanism of the influence of organically modified montmorillonites (OMts) with different modification extents on starch/OMt nanocomposites was investigated. The nanostructures of OMts and their dispersion in starch films were analyzed using X-ray diffraction (XRD) and transmission electron microscopy (TEM), respectively. The modifier content in the OMts increased with an increase in the added amount and molecular weight of the modifiers. The highestd-spacing of 3.71 nm was achieved for the OMt modified with 30% dioctadecyl dimethyl ammonium chloride (DDAC). Intercalated nanostructures were formed between starch and the OMts modified with DDAC, whereas exfoliated nanostructures were formed between starch and the OMts modified with octadecyltrimethyl ammonium chloride (OAC) and octadecyl dimethyl benzyl ammonium chloride (ODBAC). The films with the OMt modified with 50% DDAC exhibited the highest tensile strength of 6.22MPa. The water vapor permeability (WVP) of the film with the OMt modified with 30% DDAC exhibited a minimum value of 1.63 x 10(-10) g.m/m(2).s.Pa. The amount and types of the modifiers in the OMts significantly influenced the structure and properties of the starch/clay nanocomposites. For a given polymer, the modification extent of Mt should be optimized to achieve high-performance nanocomposites.
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