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POLYPROPYLENE NANOCOMPOSITES HAVING A HIGH DIMENSIONAL STABILITY
POLYPROPYLENE NANOCOMPOSITES HAVING A HIGH DIMENSIONAL STABILITY
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机译:聚丙烯纳米复合材料具有很高的尺寸稳定性
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摘要
The present invention relates to a polypropylene nanocomposite comprising (a) about 1 wt % to about 40 wt % of an acid- or acid anhydride-modified polypropylene; (b) about 0.1 wt % to about 50 wt % of an organically modified layered silicate; and (c) about 30 wt % to about 90 wt % of a nonpolar polypropylene, wherein the acid- or anhydride-modified polypropylene has a molecular weight that is lower than that of the nonpolar polypropylene, and wherein the polypropylene nanocomposite has a linear thermal expansion coefficient ranging from about 4x10SUP-5/SUP/° C. to about 9x10SUP-5/SUP/° C. The density and linear thermal expansion coefficient of these nanocomposites are, respectively, 10% to 20% and 20% to 40% less than conventional polypropylene composites and can be used to form durable molded products with superior dimensional stability, good tensile strength, good moldability, and high thermal resistance.
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