http://matdl.org/repository/ Materials Digital Library en Fez 1.3 http://blogs.law.harvard.edu/tech/rss http://matdl.org/repository/view/matdl:766 The polymeride HFPE-II-52 has proposed uses as a structural component in situations where high temperatures will be encountered. Due to the polymeride being made from a powered material voids exist in the polymeride after it was been manufactured. These voids can fill with water when placed under high humidity conditions. When the voids have filled with water and the specimen is exposed to high temperature blisters for within the sample. These can blisters cause damage that could compromise the structure in which they form. When the polymeride is used to form a graphite composite sheet the blister will split apart the sheets it is between. The sheets over the blister will delaminate furthering the damage to the structure. The polymeride's physical properties are changes by conditions formed with a temperature at or above 100 degrees Celsius and when steam is present and is at its saturation pressure. The changes in the physical properties are characterized as a decrease in the glass transition temperature as the temperature is increased. At 215 degrees with steam at its saturation pressure the glass transition temperature drops enough so that the polymeride enters its glass transition temperature. When compared to the glass transition temperature of 350-370 with no steam pressure applied deterioration of the polymeride under steam pressure become a concern. Thu, 17 Jan 2008 20:36:11 Green, Adam