Probing the dynamics in the stereocomplex of poly(L-lactic acid) and poly(D-lactic acid)
The performance of the polymers is often modified by modulating inter-molecular interaction, such as inducing chiral-stereo interaction. The proposed project focuses on the impact of the chiral-specific interaction on polymer dynamics, using polylactide (PLA) as model system. Its racemic mixture of PLLA and PDLA forms stereocomplex in the crystallized state, and sometimes even in the melted state up to 500K. In this project, we focus on the reorientational motion of methyl group and the local motion of segments with ~100ps time scale, which are most probably affected by the formation of chiral-stereocomplex. Experiments will be conducted at IN16B with the standard energy resolution of 0.75micro-eV. Both the elastic scattering intensity and as well the inelastic scattering intensity at 2micro-eV will be measured with a temperature scan from 5K up to 530K, covering the methyl-reorientation (~120K), the glass transition (320K), the cold-crystallization temperature (360K), up to the melting temperatures (443~480K), and the temperature (~500K) where the local stereocomplex in the melted PLA is broken.
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SHEN Chen; APPEL Markus; FAN Zhongyong; Bernhard Frick; LIPPMANN Milena; SEECK Oliver and VOLKOV Sergey. (2019). Probing the dynamics in the stereocomplex of poly(L-lactic acid) and poly(D-lactic acid). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1900
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