Synthesis, Characterization and Application of Methyl 3,5-Disulfo-benzoate Dipotassium Dihydrate as Nucleating Agent for Poly(L-lactide)

doi:10.1007/s40242-013-3275-4

Abstract

Abstract:

A newly synthesized aromatic sulfonate compound, complex 2 with formula of K₂[H₃COOC-C₆H₃(SO₃)₂]·2H₂O(methyl 3,5-disulfo-benzoate dipotassium dihydrate) was synthesized and characterized by elemental analysis, infrared(IR) spectrometry, nuclear magnetic resonance(NMR) and crystal structure measurement. Single-crystal X-ray diffraction(XRD) revealed that complex 2 crystallized in the triclinic system with space group P1. Complex 2 was used as nucleating agent for poly(L-lactide)(PLLA). The crystallization of PLLA with powder of complex 2 was investigated by means of differential scanning calorimetry(DSC) and polarized optical microscopy (POM). The results prove that complex 2 was effective as nucleating agent for PLLA. It could accelerate crystallization by reducing the induction time and increasing the density of nuclei in the crystallization process. The half-time of crystallization(t_0.5) for pure PLLA wasabout 8 times longer than that of PLLA sample with 1.0%(mass fraction) of complex 2.

Key words: Nucleating agent, Crystal structure, Poly(L-lactide), Isothermal crystallization

SUN Zhiqiang, ZHANG Han, PANG Xuan, BIAN Xinchao, CHEN Wenqi, CHEN Xuesi . Synthesis, Characterization and Application of Methyl 3,5-Disulfo-benzoate Dipotassium Dihydrate as Nucleating Agent for Poly(L-lactide)[J]. Chemical Research in Chinese Universities, 2014, 30(2): 333-338.

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