Hardness and compressive properties of calcium carbonateudderived from clam shell filled unsaturated polyesterudcompositesud

摘要

The correlations between hardness and compressive strength of different size ranges of filler haveudbeen investigated through experiments. The filler was ground from the shell of local clam known asudPolymesoda bengalensis and graded into eight different mean sizes. Hardness and compression tests were doneudand the compressive strength values correlated with the Vickers hardness number. The result showed that theudhardness of the unsaturated polyester was improved as the CaC03 filler was infused in the matrix. Greatudenhancement of compressive modulus was achieved as filler size and filler content increased. For compressiveudstrength, finer particles had shown better value than the courser filler at similar filler loading. The correlation ofudhardness and compressive strength of all samples was found to be lower than 3.