Abstract
Novel salts of poly(ethylene terephthalate) (PET) modified by grafting with poly(acrytic acid) (PAA) were prepared using salts of amines and Na salts of amino acid analogue, as well as of alkali and alkali earth metal. Changes in hygroscopicity, tensile properties, bending rigidity of fabric, electrostatic property, and thermal stability by the grafting and the salt formation were investigated.In the case of amine and alcohlic amine salts, moisture regain were reduced due to the steric hindrance, in adsorbing site for water molecule, in the presence of bulky alkyl groups attached to nitrogen atom. For the samples reacted with alkali metal salts, hygroscopicity increased with ionic strength of metal. By alkali metal salt formation, tensile strength decreased by 25% in comparison with that of PAA-grafted PET. On the other hand, fibers reacted with novel salts retained the tensile strength same as that of PAA-grafted PET. Moreover, PET fabrics modified as mentioned above showed slight decrease of bending rigidity. The activation energy for thermal degradation reaction was estimated by moltiple heating rate method by thermogravimetry. It was elucidated that the thermal stability of the above samples was generally reduced except the sample reacted with Ca ion.
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