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Nucleation Effects of Nucleobases on the Crystallization Kinetics of Poly( L ‐lactide)
Author(s) -
Pan Pengju,
Yang Jinjun,
Shan Guorong,
Bao Yongzhong,
Weng Zhixue,
Inoue Yoshio
Publication year - 2012
Publication title -
macromolecular materials and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 96
eISSN - 1439-2054
pISSN - 1438-7492
DOI - 10.1002/mame.201100266
Subject(s) - nucleation , materials science , crystallization , supercooling , spherulite (polymer physics) , uracil , kinetics , isothermal process , nucleobase , chemical engineering , crystallography , thermodynamics , organic chemistry , chemistry , dna , biochemistry , physics , quantum mechanics , engineering
The effects of nucleobases, especially uracil, on the nonisothermal and isothermal crystallization, melting behavior, spherulite morphology, and crystalline structure of bio‐based and biodegradable PLLA are studied. The melt‐ and cold‐crystallization rates of PLLA increase with increasing uracil loading. The melting behavior of nonisothermally melt‐ and cold‐crystallized PLLAs depends on the uracil content. The isothermal crystallization kinetics is analyzed based on an Avrami model. The incorporation of uracil changes the t 1/2 / T c profile of PLLA due to the more distinct heterogeneous nucleation effects at small supercooling. The crystalline structure of PLLA is not affected by uracil presence. The nucleation density increases and the spherulite size decreases by uracil incorporation.