Modified unsaturated polyester (MUPE) was blended with Cellulose (Cls) and with ethyl cellulose (ECls) at ambient conditions in the
presence of ethyl methyl ketone peroxide (EMKP) as hardener. The blends containing different weight percentages (5-25 %) of Cls or ECls.
Mechanical properties (impact strength, hardness, and bending) and dielectric constant were determined. The results observed that Cls
increases the impact strength, hardness, and dielectric constant and decreases the bending of the MUPS, while ECls causes an increase in
the three mechanical behaviours and a decrease in the dielectric constant of the MU-PS.
Key words: unsaturated polyester, resins, mechanical, dielectric constant; cellulose and ethyl cellulose blends
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