Journal ArticleDOI
Polymer Crystallization By Chemical Nucleation
TLDR
In this article, the mechanism of action of organic nucleating agents such as sodium benzoate and its derived salts completely differs from the generally accepted model, at least in the case of polyesters.Abstract:
Several attempts1–5 have been made to control the rate of crystallization and the morphology by the addition of very finely-divided substances which promote abundant nucleation. However, these studies have mostly been carried out on an empirical basis and, except in a few cases (self-seeding6, epitaxy2–5), the mechanism of action of these nucleating agents is poorly understood despite several attempts at modelling1,2. This is particularly so in the case of most technical nucleating agents such as mica, talc and organic salts. We report here that the mechanism of action of organic nucleating agents such as sodium benzoate and its derived salts completely differs from the generally accepted model, at least in the case of polyesters. The nucleating agent reacts as a true chemical reagent with the molten macromolecules and produces ionic end groups which constitute the true nucleating species.read more
Citations
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Journal ArticleDOI
Using a Self-Assemblable Nucleating Agent To Tailor Crystallization Behavior, Crystal Morphology, Polymorphic Crystalline Structure, and Biodegradability of Poly(1,4-butylene adipate)
Jinjun Yang,Rong Liang,Yichun Chen,Chunqiu Zhang,Ruiling Zhang,Xiaomin Wang,Rui Kong,Qixian Chen +7 more
TL;DR: In this paper, the decamethylenedicarboxylic dibenzoylhydrazide (DMC-DBH) was used as a nucleating agent to introduce into the poly(1,4-butylene adipate) (PBA) matrix.
Journal ArticleDOI
Effect of nucleating agents on the molar mass distribution and its correlation with the isothermal crystallization behavior of poly(L‐lactic acid)
Maurizio Penco,Gloria Spagnoli,Isabella Peroni,M. Arifur Rahman,M. Arifur Rahman,Marco Frediani,W. Oberhauser,Andrea Lazzeri +7 more
TL;DR: In this article, the effect of the processing conditions on the thermal behavior of a commercial poly(L-lactic acid) (PLLA) was investigated, in particular, PLLA having a very high molecular weight was proc- essed by a discontinuous mixer at different mixing conditions.
Journal ArticleDOI
Effective nucleating chemical agents for the crystallization of poly(trimethylene terephthalate)
TL;DR: In this paper, the effects of organic sodium (Na) salts, including Na stearate, Na benzoate, disodium p-phenolsulfonate (2Na-p-PS), disodiump-hydroxybenzoate and 2Na p-HB, were investigated as nucleating chemical agents with differential scanning calorimetry and capillary viscometry.
Journal ArticleDOI
Nucleation of poly(hydroxy butyrate) by epitaxy on nitrogen-containing compounds
S. J. Organ,P. J. Barham +1 more
TL;DR: In this paper, it was shown that NH4Cl has a lattice match with poly(hydroxy butyrate) (PHB), and that there is some epitaxial growth of PHB crystals on to NH4CL.
Journal ArticleDOI
Crystallization behaviours of bacterially synthesized poly(hydroxyalkanoate)s in the presence of oxalamide compounds with different configurations
TL;DR: The oxalamide compounds with ringy terminal structures (cyclohexyl and phenyl), notably the phenyl group, show higher nucleation efficiency and a better compatibility in the PHAs matrix, while the linear terminal structure (n-hexane) has poor nucleation effect.
References
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Journal ArticleDOI
Epitaxial crystallization of polyethylene on organic substrates: A reappraisal of the mode of action of selected nucleating agents
J. C. Wittmann,Bernard Lotz +1 more
Journal ArticleDOI
Cristallisation et fusion des polymères autoensemencés
G. Vidotto,D. Lévy,A. J. Kovacs +2 more
TL;DR: In this paper, a technique d'autoensemencement for obtenir des preparations homogenes de monocristaux en solution a ete appliquee a la cristallisation des polymeres fondus, stabilises par recuit.
Journal ArticleDOI
The epitaxial crystallization of macromolecules
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Epitaxial crystallization of polyethylene on organic substrates: A reappraisal of the mode of action of selected nucleating agents
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