Abstract
In this paper, mechanical and dielectric properties of Poly (ethylene terephthalate) (PET) modified by calcium lignosulfonate were measured. The mechanical measurement results show that the introduction of the third monomer LS could significantly reinforce and toughen PET. When LS content was increasing from 0 to 0.5%, the tensile strength of PET was increasing from 54MPa to 62MPa，resulting in an increasing rate of 15%; flexural strength was increased from 85MPa to 92MPa, resulting in an increasing rate of 8%; impact strength was increasing from 2.5KJ.m-2to 4.2 KJ.m-2, resulting in an increasing rate of 68%; but excessive content of lignin would harm mechanical properties of PET. Dielectric measurement results indicated that LS had positive effect on decreasing dielectric loss of PET while content of LS was about 0.5%. LS is an effective additive to improve mechanical and dielectric properties of PET.
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