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In this work, two new diacids, di(m-carboxyphenyl) succinate (m-dCPS) and di(o-carboxyphenyl) succinate (o-dCPS), were synthesized by reaction of m-, o-hydroxy benzoic acid with succinic chloride, respectively. Their corresponding copolymers with sebacic acid (SA), P(m-dCPS:SA) and P(o-dCPS:SA), were prepared by melt copolycondensation and characterized by NMR, UV and DSC methods. Compared with inherently fluorescent poly[di(p-carboxyphenyl) succinate-co-sebacic anhydride] (P(p-dCPS:SA)), P(m-dCPS:SA) and P(o-dCPS:SA) displayed different luminescent properties. P(m-dCPS:SA) could emit fluorescence under the excitation of both visible and UV light, while P(o-dCPS:SA) could only emit fluorescence when excited with UV light. Degradation rate of the two new copolyanhydrides increased with the increase of SA fraction in the copolymers. In addition, P(o-dCPS:SA) degraded more rapidly than P(m-dCPS:SA) with the same composition. Typical surface-degradation characteristics of these copolyanhydrides were observed.
In this work, two new diacids, di (m-carboxyphenyl) succinate (m-dCPS) and di (o- carboxyphenyl) succinate (o-dCPS), were synthesized by reaction of m-, o- hydroxybenzoic acid with succinic chloride , respectively. Their corresponding copolymers with sebacic acid (SA), P (m-dCPS: SA) and P (o-dCPS: SA), were prepared by melt copolycondensation and characterized by NMR, UV and DSC methods. Compared with inherently fluorescent poly (di-p-carboxyphenyl) succinate-co-sebacic anhydride (P (p-dCPS: SA) m-dCPS: SA) could emit fluorescence under the excitation of both visible and UV light, while P (o-dCPS: SA) could only emit fluorescence when excited with UV light. Degradation rate of the two new copolyanhydrides increased with the increase of In addition, P (o-dCPS: SA) degraded more rapidly than P (m-dCPS: SA) with the same composition. Typical surface-degradation characteristics of these copolyanhyds rides were observed.