Abstract
The isothermal crystallization behavior of poly(l-lactide) (PLLA) at 150 °C from the melt was monitored by infrared (IR) spectroscopy. The two-dimensional (2D) correlation analysis of time-dependent IR spectra collected during the melt crystallization process revealed details about the intermolecular interaction of the CH3 and CO groups and the conformational changes in the C−O−C backbone that are not easily detected by conventional one-dimensional spectra. It was found that the intermolecular interaction of the CH3 group appears during both the induction period and the growth period of PLLA melt crystallization, while the intermolecular coupling of the CO group can only be observed during the crystallization period. The order formation of C−O−C backbone during the induction period of PLLA melt crystallization can also be clearly observed in the 2D synchronous spectra. These observations not only provide direct evidence that the distorted 103 helix conformation of PLLA chain in α crystals is due to the in...
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