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Crystallization behavior and morphology of poly(lactic acid) with a novel nucleating agent
Author(s) -
Zou GuoXiang,
Jiao QingWei,
Zhang Xin,
Zhao CaiXia,
Li JinChun
Publication year - 2015
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.41367
Subject(s) - crystallization , differential scanning calorimetry , talc , peg ratio , nucleation , crystallinity , materials science , polarized light microscopy , chemical engineering , ethylene glycol , optical microscope , lactic acid , polymer chemistry , scanning electron microscope , composite material , chemistry , organic chemistry , physics , genetics , finance , optics , biology , bacteria , engineering , economics , thermodynamics
To improve the crystallization ability of poly(lactic acid) (PLA), a novel nucleating agent with a benzoyl hydrazine compound was used in this study. The crystallization behaviors of PLA/talc and PLA/bibenzoylhydrazinepropane (BBP) with or without poly(ethylene glycol) (PEG) were investigated with differential scanning calorimetry (DSC) and polarized optical microscopy. The DSC curves showed that the crystallization temperature and crystallinity of PLA/BBP (PBBP) was higher than that of PLA/talc. With the addition of PEG, a synergistic effect was found. According to the results of nonisothermal crystallization kinetics, the values of F ( T ) of PBBP 0.5 PEG 5 were usually smaller than those of PTa 3 PEG 5 , so the nucleation efficiency of BBP was much better than that of talc. From a polarized optical microscopy photo, it was easy to determine that the nucleation density of BBP was higher than that of PTa 3 PEG 5 , and the spherulitic diameter increased linearly with the crystallization time no matter the impingements. The spherulitic growth rate of PBBP 0.5 PEG 5 was faster than that of PTa 3 PEG 5 , and the induction time of PBBP 0.5 PEG 5 was the shortest among all of the samples. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41367.