Effects of Biodegradable Imidazolium-Based Ionic Liquid with Ester Group on the Structure and Properties of PLLA

다국어 초록 (Multilingual Abstract)

Blends of poly(L-lactide) (PLLA) and a functional ionic liquid (IL), 3-methyl-1-(ethoxycarbonylethyl) imidazoliumtetrafluoroborate ([AOEMIm][BF4]) with various weight ratios were prepared by melt compounding andtheir interactions, compatibilities, processing characteristics, crystallization behaviors, mechanical properties and thermaldegradation were investigated in this study. The interaction between PLLA and [AOEMIm][BF4] was first studiedby infrared spectroscopy (IR) investigation, and then the Flory-Huggins interaction parameter between PLLA and[AOEMIm][BF4] was calculated. The compatibility was also supported by both sample appearance and scanning electronmicroscopy (SEM) results. Crystallization and melting conditions were obtained from differential scanning calorimetry(DSC), and the glass transition temperature (Tg) of PLLA showed a gradual decrease with the increasing addition of[AOEMIm][BF4]. The balancing torque data were obtained by Haaker torque rheometry, and the molecular weight data ofprocessed PLLA obtained by gel permeation chromatography (GPC) tests reflected a positive effect of [AOEMIm][BF4]on the melt-processing of PLLA. A strong increase of the mechanical parameters of PLLA, such as the elongation atbreak and the impact strength, was observed with the incorporation of [AOEMIm][BF4] up to the content of 7 phr (phris the abbreviation for parts per hundreds of resin, n phr denoted n g IL/100 g PLLA), while the tensile strength decreasedslightly. The thermal stability of PLLA took a sustained downward trend, with the increasing contents of [AOEMIm][BF4] inits matrices, as presented from thermogravimetric analysis (TGA). PLLA blended with 5 phr [AOEMIm][BF4] achievedexcellent overall performance; as well, the mechanical properties improved considerably, and damage to the thermal stabilitywas acceptable.

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