Abstract
Poly(ethylene naphthalene-2,6-dicarboxylate) and poly(1,4-butylene naphthalene-2,6-dicarboxylate) homopolymers were synthesized by the two-step melt polycondensation process of dimethyl naphthalene-2,6-dicarboxylate and ethylene glycol (EG) or 1,4-butanediol (BD) respectively. Eight copolymers of the above three monomers were also synthesized by varying the mol% of BD with respect to EG in the initial monomer feed. The copolymer composition was determined by 1H n.m.r. spectroscopy. The thermal behaviour was investigated over the entire range of copolymer composition by differential scanning calorimetry and thermomechanical analysis. The glass transition ( T g), cold crystallization ( T cc), melting point ( T m) and crystallization ( T c) temperatures have been determined. The melting temperature of the above copolymers was depressed gradually at first with the increase of BD in the composition and eutectic behaviour appeared with a minimum at about 40 mol% BD content.
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