Extensive DSC characterization reveals that all the crystallization curves of pyrene as a function of polymer composition have upper critical crystallization temperatures. We believe the upper critical behavior suggests that the crystallization of pyrene in the polymer solutions are directed and assisted by the spinodal limits of the hidden liquid—liquid phase domains located inside the two-phase domains of pyrene crystals and polymer-rich liquid phases.
We also observed that, for pyrene mixed with relatively non-polar polystyrene or poly ethylene- alt -propylene , the crystallization temperature curves of pyrene shift with the melting temperature curves of pyrene crystals. This result is consistent with the classical Flory—Huggins theory which describes the thermodynamic behavior of polymer solutions using the chemical compatibility between the solvent and polymer.
In contrast, the crystallization curve of pyrene mixed with relatively polar poly 2-vinylpyridine is observed in the higher temperature domain despite the melting temperature curve of the pyrene crystals with poly 2-vinylpyridine being shifted to the lower temperature domain due to the favorable chemical compatibility between pyrene and poly 2-vinylpyridine compared to those with the other relatively non-polar polymers. We attribute the contrasting melting and crystallization behavior of pyrene in the poly 2-vinylpyridine solutions to the high dipole moment of poly 2-vinylpyridine that induces an enlarged hidden liquid phase domain due to the attractive interactions between poly 2-vinylpyridine segments.
These findings show that polymers are effective and versatile additives for controlled crystallization of organic compounds using the hidden liquid—liquid phase domains. The article was received on 14 May , accepted on 30 Jul and first published on 30 Jul If you are not the author of this article and you wish to reproduce material from it in a third party non-RSC publication you must formally request permission using Copyright Clearance Center.
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Although most of the experimental observations referring to macromolecular. The individual contributions to this issue of the Advances in PolymerScience are grouped according to the degree they are connected with the previoustext books. The first part B. Wolf deals with a straightforward extension of the FloryHuggins theory to account for some aspects of chain connectivity and for the fact. Maurer et al. Information in this field is of particular interest for polymer foaming and for the. The fourth section S. Anastasiadis isconcerned with interfacial phenomena in the case of polymer blends and reports the.
The fifth contribution S. Enders formulates a theory for the simulation ofcopolymer fractionation in columns with respect to molecular weight and chemical.
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Binder et al. This section reviews the state of the art in fields of Monte. The final chapter G. Sadowski makes use of the results obtained with simulation tools for the establishment of. Published on Dec View Download 9. Wolf With contributions by S. Yelash EditorsDr. Wim H. Timothy E. Also, all back volumes are available electronically.
If you do not have access, you can still view the table of contents of each volume and the abstract of each article by going to the SpringerLink homepage, clicking on Browse by Online Libraries, then Chemical Sciences, and finally choose Advances in Polymer Science. Color figures are published in full color in the electronic version on SpringerLink. It is addressed to all scientists at universi- ties and in industry who wish to keep abreast of advances in the topics covered Review articles for the topical volumes are invited by the volume editors. As a rule, single contributions are also specially commissioned.
The editors and pub- lishers will, however, always be pleased to receive suggestions and supplementary information. Special volumes are edited bywell known guest editors who invite reputed authors for the review articles in their volumes. Impact Factor in 4.
Although most of the experimental observations referring to macromolecular systems could already be rationalized on the basis of the well-known Flory Huggins theory, quantitative agreement between experiment and theory is normally lacking. The reason for this deficiency lies in several inevitable simplifying assumptions that had to be made during this ground-breaking period of research. In the meantime, valuable progress could be achieved, thanks to modern com- puters, improvements of experimental methods, and data handling. This situation has among others provoked a new textbook  focusing on polymer phase dia- grams.
It is the central purpose of this volume to present some further examples for recent developments that were made possible by the above-described improve- ments. Wolf deals with a straightforward extension of the FloryHuggins theory to account for some aspects of chain connectivity and for the fact that chain molecules may react on changes in their molecular environment by conformational rearrangements. In this manner, several hitherto unconceivable experimental observations like pronounced composition dependencies of interac- tion parameters or their variation with chain length can be understood and modeled quantitatively.
This contribution is followed by a chapter devoted to progress in the field of polyelectrolyte solutions G. Such thermodynamic knowledge is particularly needed for different industrial application of polyelectrolytes, for instance in textile, paper, food, and pharmaceutical industries.
An interesting example for the development and advancement of experimental methods is presented in the third chapter J. Grolier et al. Information in this field is of particular interest for polymer foaming and for the self-assembling of nanoscale structures. Anastasiadis isconcerned with interfacial phenomena in the case of polymer blends and reports the current state of the art on measuring and modifying interfacial tensions as well as different possibilities for its modeling.
Such information is indispensible for the development and optimization of tailor-made materials based on two-phase polymer blends. Enders formulates a theory for the simulation ofcopolymer fractionation in columns with respect to molecular weight and chemical composition. Narrowly distributed polymers are often required for basic research and the removal of harmful components is sometimes essential for special applications.
All previously discussed methods are primarily based on phenomenological considerations, in contrast to chapter six K. This section reviews the state of the art in fields of Monte Carlo and Molecular Dynamics simulations.
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These methods are powerful tools for the prediction of macroscopic properties of matter from suitable models for effec- tive interactions between atoms and molecules. Sadowski makes use of the results obtained with simulation tools for the establishment of molecular-based equations of state for engineering applications. This approach enables the description and in some cases even the prediction of the phase behavior as a function of pressure, temperature, molecular weight distribution and for copolymers also as a function of chemical composition.