Field-theoretical approach to critical microphase behavior of symmetric crosslinked polymer blends

Benhamou, Mabrouk
April 1995
Journal of Chemical Physics;4/8/1995, Vol. 102 Issue 14, p5854
Academic Journal
Critical properties of symmetric crosslinked binary polymer mixtures is studied using the renormalization-group. It is assumed that chains have a low-molecular-weight, in order to have a wide critical regime where a nonclassical behavior is observed. Use is made of a scalar field model of φ4 type, where the order parameter φ is the local fluctuations in the composition. The parameters of the problem are the temperature t∝χ0-χ, the rigidity constant of the gel C, and the coupling constant u. χ is the Flory interaction parameter, χ0=2/N its critical value if the system is uncrosslinked, and N the degree of polymerization. We first show that the set of demixing critical points is a continuous line, in the two-dimensional half-space of parameters -∞


Related Articles

  • Initiators Come to Life. Fairley, Peter // Chemical Week;4/21/1999, Vol. 161 Issue 15, p47 

    Focuses on the highly active and flexible initiator compound that can be use in living polymerization discovered by polymer chemist at IBM Almaden Research in San Jose, California. How the research program for living polymerization has started; Goal of IBM on its polymer research.

  • Phase Transitions of a Polymer Threading a Membrane: Character of the Transition When the Molecule Can Undergo a Helix-Random Coil or an Equilibrium Polymerization Transition. Di Marzio, Edmund A.; Kasianowicz, John J. // AIP Conference Proceedings;2003, Vol. 665 Issue 1, p344 

    The polymer threading a membrane transition (PTM) which is a first-order thermodynamic phase transition for an isolated linear polymer in the limit of infinite molecular weight is coupled to the helix to random coil (HRC) transition and the polymerization (P) transition. In each case an exact...

  • The effect of chain correlations on the size of polymer coils in binary polymer blends. Garas, George E.; Kosmas, Marios K. // Journal of Chemical Physics;9/15/1996, Vol. 105 Issue 11, p4789 

    In order to study the size of the chains in binary polymer blends we determine the mean-square end-to-end distance of the polymer coils of the A or B kind. Chains A and B interact generating the one-loop diagrams, which are summed up to all orders of concentration and interaction. Interactions...

  • Conformational disorder in long polyenes. Wood, Phillip; Samuel, Ifor D. W.; Schrock, Richard; Christensen, Ronald L. // Journal of Chemical Physics;12/15/2001, Vol. 115 Issue 23, p10955 

    We have studied the temperature dependence of the absorption spectra of soluble, conjugated polymers of known chain length (∼100–1000 double bonds), synthesized by Schattenmann et al. [Macromolecules 29, 8990 (1996)] using living polymerization techniques. The polymer spectra show...

  • Universal shape ratios for polymers grafted at a flat surface. Causo, Maria Serena // Journal of Chemical Physics;10/8/2002, Vol. 117 Issue 14, p6789 

    We consider dilute nonadsorbed polymers grafted at an impenetrable surface and compute by Monte Carlo simulations several quantities which characterize the polymer shape: the asphericity and the ratios of the eigenvalues of the radius-of-gyration tensor. The results are only slightly different...

  • Pure solvents and complex conditions not needed for 'designer' polymers.  // Process Engineering;Mar2002, Vol. 83 Issue 3, p13 

    Discusses the living/controlled polymerization, a process which grows the polymers in common solvents and at manageable temperatures. Significance of the system; Company that has been founded to commercialize the technology.

  • Polymer potpourri. Sivaram, Dr. S. // Chemical Business;Aug98, Vol. 12 Issue 8, p9 

    Presents news items related to polymers and polymerization in India as of August 1998. Includes processes that eliminate the drawback from methyl methacrylate; Enzymatic route to polymers; Polymerization of methylglyoxalate; Alkene metathesis polymerization; Recommended books.

  • Exact solution of boundary value problems involving linear processes of growth and transport in addition polymerization. Rabeony, H. M.; Reiss, H. // Journal of Chemical Physics;8/1/1989, Vol. 91 Issue 3, p1875 

    Exact mathematical descriptions are obtained for the following process. Polymers are initiated and then propagated by a chain addition reaction in a convectionless medium in a cylindrical vessel. An external field (e.g., gravity) may be present, and the polymers may diffuse to the vessel walls...

  • Polyanhydrides: Synthesis, Properties, and Applications. Poetz, Katie L.; Shipp, Devon A. // Australian Journal of Chemistry;2016, Vol. 69 Issue 11, p1223 

    This review focusses on polyanhydrides, a fascinating class of degradable polymers that have been used in and investigated for many bio-related applications because of their degradability and capacity to undergo surface erosion. This latter phenomenon is driven by hydrolysis of the anhydride...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics