臺灣國際科展

Effects of Transition Metal Ions on the Thermal Stability,Fire Retardant Properties and Rheological

科展類別
臺灣國際科展
屆次
2006年
科別
化學科
得獎情形
第一名
學校名稱
Herricks High School
指導老師
Charles D. Duggan
作者
Andrew Sangho Kim

摘要或動機

A study was conducted to improve the thermal stability, fire retardant (FR)\r
properties and rheological properties of ethy-lene vinyl acetate because of\r
its growing use in commercial applications. The approach employed\r
was to modify an organo-clay, Closite 20A (C20A), with transition metal\r
ions (TMI). In this study eight transition metal salts were acquired for\r
modification. It was observed that all TMI modified organoclay\r
nanocomposites improved thermal stability through thermo-gravimetric\r
analysis (TGA). Rheological testing was done using a parallel plate\r
measuring system (PP MS) to determine the dependence of storage\r
modulus and loss modulus of copper and iron modified organoclay\r
nanocomposites relative to pure EVA 350. The process of gelation was\r
also tested for by calculating the ratio between the loss modulus and the\r
storage modulus. It was found that copper modified organoclay\r
nanocomposites promoted gelation and thus decreased the fluidity of\r
EVA 350. The intercalation of the TMI modified organoclays with the\r
polymer matrix was determined by the use of small angle X-ray\r
scattering (SAXS). Testing revealed that the intercalation was\r
successful, further proving that the TMIs had improved thermal stability,\r
FR properties and rheological properties,


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