采用不同尺寸的碳酸钙粒子增韧高密度聚乙烯,研究了不同温度下共混体系的临界粒子间距与碳酸钙粒子尺寸和含量之间的关系,确定了温度是Wu氏增韧理论临界粒子间判据适用性的重要影响因素.结果表明,在17℃下,临界粒子间距与碳酸钙粒子的尺寸和含量无关,该条件下Wu氏增韧理论临界粒子间距判据是适用的;而随着温度的升高,发现临界粒子间距依赖于碳酸钙粒子的尺寸,表明高温条件下,Wu氏增韧理论临界粒子间距判据不再适用.%High density polyethylene was toughened by calcium carbonate ( CaCO3) with different particle sizes. The relationship between critical interparticle distance (IDc) and CaCO3 content and particle size was studied at different temperatures. The purpose is to clarify that temperature is one of the important parameters for applicability of Wu's criterion. The results indicate that the IDc is almost independent of CaCO3 content and particle size at 17 ℃, that is, the criterion is applicable to this case. With an increase in the temperature, the results clearly show that IDc depends on the CaCO3 particle size at higher temperatures, that is, the criterion is inapplicable at higher temperatures.
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