Concentration dependence of solution crystallization for poly(l-lactide) in p-xylene |
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Authors: | Hao Hong Guozheng Liang |
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Affiliation: | College of Chemical Engineering, Northwest University, Xi`an 710069, PR China School of Natural and Applied Sciences, Northwest Polytechnical University, Xi`an 710072, PR China The State Key Laboratory of Coordination, Nanjing University, Nanjing 210093, PR China |
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Abstract: | The macromolecular chain conformation in solution changes with the solvent and temperature, which will affect the formation of crystalline structure in the subsequent crystallization process. The crystallization behavior of poly(l-lactide) samples prepared from solutions with various concentrations was studied by differential scanning calorimetric and X-ray diffraction. It is found that the sample recovered from a dilute solution exhibits higher crystallinity, higher non-isothermal crystallization temperature and faster crystallization rate. The condensation process of polymer chain in dilute solutions has an influence on the crystallization of polymer in the solid state. This results in the acceleration of the melt crystallization rate and the rise of non-isothermal crystallization temperature of PLLA recovered from the dilute solution. |
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Keywords: | l-lactide)" target="_blank">Poly(l-lactide) Crystallization Differential scanning calorimetric Entanglement |
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