Modeling the conformations and motions of isolated polymer chains in the narrow channels of their crystalline inclusion compounds with small-molecule, host clathrates

1993 ◽  
Vol 65 (1) ◽  
pp. 133-144 ◽  
Author(s):  
Alan E. Tonelli
Keyword(s):  
Small Molecule ◽  
Inclusion Compounds ◽  
Polymer Chains ◽  
Crystalline Inclusion ◽  
Crystalline Inclusion Compounds ◽  
Narrow Channels

scholarly journals Restructuring polymers via nanoconfinement and subsequent release

2012 ◽  
Vol 8 ◽  
pp. 1318-1332 ◽  
Author(s):  
Alan E Tonelli
Keyword(s):  
Small Molecule ◽  
Polymer Chains ◽  
Crystalline Lattice ◽  
Host Molecule ◽  
Nanostructured Polymers ◽  
Narrow Channels ◽  
The Past ◽  
The Relationship ◽  
Melting And Crystallization Temperatures ◽  
Melting And Crystallization

During the past several years my students and I have been utilizing certain small-molecule hosts to create nanostructured polymers. This is accomplished by first forming noncovalently bonded inclusion complexes (ICs) between these small-molecule hosts and guest polymers, followed by the careful removal of the host crystalline lattice to obtain a coalesced bulk polymer. We have repeatedly observed that such coalesced polymer samples behave distinctly from those produced from their solutions or melts. Coalesced amorphous homopolymers exhibit higher glass-transition temperatures, while crystallizable homopolymers coalesced from their ICs display higher melting and crystallization temperatures, and sometimes different crystalline polymorphs. When ICs are formed with block copolymers or with two or more different homopolymers, the resulting coalesced samples can exhibit intimate mixing between the copolymer blocks, or between entire homopolymer chains. Each of the distinct behaviors observed for polymers coalesced from their ICs is a consequence of the structural organization of the polymer–host-ICs. Polymer chains in host-IC crystals are confined to occupy narrow channels (diameter ~0.5–1.0 nm) formed by the small-molecule hosts around the included guest polymers during IC crystallization. This results in the separation and high extension of the included guest polymer chains, which leads, following the careful removal of the host molecule lattice, to unique behaviors for the bulk coalesced polymer samples. Apparently, substantial degrees of the extended and unentangled natures of the IC-included chains are retained upon coalescence. In this review we summarize the behaviors and uses of coalesced polymers, and attempt to draw conclusions on the relationship between their behavior and the organization/structures/conformations of the constituent polymer chains achieved upon coalescence from their ICs.

scholarly journals Crystalline Inclusion Compounds of a Palladacyclic Tetraol Host Featuringo-Carborane Units

2017 ◽  
Vol 2017 (38-39) ◽  
pp. 4589-4598 ◽  
Author(s):  
Min Ying Tsang ◽  
Clara Viñas ◽  
Francesc Teixidor ◽  
Duane Choquesillo-Lazarte ◽  
José Giner Planas
Keyword(s):  
Inclusion Compounds ◽  
Crystalline Inclusion ◽  
Crystalline Inclusion Compounds

Formation of crystalline inclusion compounds of poly (vinyl chloride) of different stereoregularity with γ-cyclodextrin

2007 ◽  
Vol 45 (12) ◽  
pp. 2503-2513 ◽  
Author(s):  
Gerardo Martínez ◽  
Marián A. Gómez ◽  
Silvia Villar-Rodil ◽  
Leoncio Garrido ◽  
Alan E. Tonelli ◽  
...  
Keyword(s):  
Vinyl Chloride ◽  
Inclusion Compounds ◽  
Crystalline Inclusion ◽  
Crystalline Inclusion Compounds ◽  
Poly Vinyl Chloride
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