The crystallization kinetics of semicrystalline polymers is often studied with isothermal experiments and analyzed by fitting the data with analytical expressions of the Avrami and Lauritzen and Hoffman(LH)theories.To...The crystallization kinetics of semicrystalline polymers is often studied with isothermal experiments and analyzed by fitting the data with analytical expressions of the Avrami and Lauritzen and Hoffman(LH)theories.To correctly carry out the analysis,precautions in both experiments and data fitting should be taken.Here,we systematically discussed the factors that influence the validity of the crystallization kinetics study.The basic concepts and fundamentals of the Avrami and LH theories were introduced at first.Then,experimental protocols were discussed in detail.To clarify the impact of various experimental parameters,selected common polymers,i.e.,polypropylene and polylactide,were studied using various experimental techniques(i.e.,differential scanning calorimetry and polarized light optical microscopy).Common mistakes were simulated under conditions when non-ideal experimental parameters were applied.Furthermore,from a practical point of view,we show how to fit the experimental data to the Avrami and the LH theories,using an Origin■App developed by us.展开更多
基金financially supported by the the National Natural Science Foundation of China (Nos.21922308 and 51820105005)the National Key R&D Program of China (No.2017YFE0117800)+3 种基金the financial support from the BIODEST projectfunding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No.778092The funding of MICINN (Spain) through grant PID2020-113045GB-C21 is gratefully acknowledgedthe Youth Innovation Promotion Association of the Chinese Academy of Sciences (No.Y201908)
文摘The crystallization kinetics of semicrystalline polymers is often studied with isothermal experiments and analyzed by fitting the data with analytical expressions of the Avrami and Lauritzen and Hoffman(LH)theories.To correctly carry out the analysis,precautions in both experiments and data fitting should be taken.Here,we systematically discussed the factors that influence the validity of the crystallization kinetics study.The basic concepts and fundamentals of the Avrami and LH theories were introduced at first.Then,experimental protocols were discussed in detail.To clarify the impact of various experimental parameters,selected common polymers,i.e.,polypropylene and polylactide,were studied using various experimental techniques(i.e.,differential scanning calorimetry and polarized light optical microscopy).Common mistakes were simulated under conditions when non-ideal experimental parameters were applied.Furthermore,from a practical point of view,we show how to fit the experimental data to the Avrami and the LH theories,using an Origin■App developed by us.
