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Indexed by:Journal Papers

Date of Publication:2015-06-01

Journal:JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY

Included Journals:SCIE、EI、Scopus

Volume:120

Issue:3

Page Number:1799-1810

ISSN No.:1388-6150

Key Words:Poly(butylene succinate); Crystallization; Melting behavior; Phosphorus containing

Abstract:Novel biodegradable poly(butylene succinate) (PBS) copolyesters containing phosphors flame-retardant groups were synthesized by melt-polycondensation from succinic acid and 9,10-dihydro-10-[2,3-di(hydroxycarbonyl)propyl]-10-phosphaphenanthrene-10-oxide (DDP) with 1,4-butanediol. In order to analyze the effects of the third monomer (DDP) on the relative properties of PBS, the composition, crystal structure, crystallization behavior, multiple melting behavior, and spherulitic morphology of the copolyesters were investigated by H-1-NMR, WAXD, DSC, and POM, respectively. WAXD data revealed that the crystal structure of PBS was not affected by DDP. The overall crystallization kinetic showed that the crystallization of PBS was retarded with the introduction of DDP, especially when the DDP content exceeds 7.5 mol%, which may result from the stereo-hindrance of DDP unit. Furthermore, crystallization temperature (T (c)), crystallization enthalpy (Delta H (c)), melting temperature (T (m)), and crystallinity (X (c)) of PBS copolyesters also decreased apparently with the increase in DDP contents. Also, the equilibrium melting temperature (T (m) (o) ) obtained from Hoffman-Weeks analysis decreased, indicating that the regularity of PBS chain segments was reduced probably due to the diluent effect of the specific chain structure of DDP. All spherulites showed the ring-banded extinction patterns, which implied that phosphorus-containing (DDP) segment did not change the growth mechanism of PBS crystals.