Expressions are presented for the moisture distribution and the moisture content as a function of time of one dimensional homogeneous and composite materials exposed either on one side or on both sides to humid air or to water. The results apply during both moisture absorption and desorption when the moisture content and the temperature of the environment are constant. Test procedures are described for determining experimentally the values of the moisture content and the diffusivity of composite materials. A series of tests using unidirectional and π/4 Graphite T-300 Fiberite 1034 composites were performed in the temperature range 300—425 K with the material submerged both in moist air (humidity 0 to 100%) and in water. The test data support the analytical results and provide the moisture absorption and desorption characteristics of such composites. Extension of the results to materials exposed to time varying environmental conditions is indicated.

No abstract

A swollen polysaccharide multilayer was coated on an IOL to inhibit LEC adhesion and proliferation, thus decreasing PCO incidence after implantation.

The buckling moduli of Thornel 300/Fiberite 1034 graphite epoxy composites were measured at temperatures ranging from 105 K to 422 K and at moisture contents ranging from 0% (dry) to 1.5% (fully saturated). The measurements were made using 0°, 90° and π/4 laminates. A survey was also made of the existing data showing the effects of temperature and moisture content on the tensile modulus and the compressive modulus of different composite materials. SCOPE N ORDER TO utilize the full potential of composite materials their performance Iduring and after exposure to high temperature and high humidity environments must be known. One of the most important parameters in the design of composite elements and structures is the elastic modulus. The effects of temperature and moisture content on tensile (Et) and compressive (Ec) moduli have been studied in the past. The objective of this investigation was to evaluate the changes in the buckling modulus (Eb) of composite materials exposed to air in which the temperature ranged from 195 K to 450 K and the moisture content from 0% (dry) to 1.5% (fully saturated). The changes in the buckling modulus were measured by performing buckling tests on. Thornel 300/Fiberite 1034 graphite epoxy composites using 0°, n/4 and 90° lay-ups. A summary was also made of the existing data. This summary, together with the present results, was used to assess the influence of the temperature and the moisture content on the elastic moduli of composite materials.