Poly oligomeric model

Pang, Li, and Barton indicated, based on viscosity data, that PAEs had a stiff structure in solution [43]. A PAE shows a Mark-Houwink constant as high as a= 1.92 [43], revealing that it has a very stiff structure, similar to rodlike poly-(pyridine-2,5-diyl) [65,66]. Liquid crystalline behavior of PAEs with a meso-gen has been reported [45]. The chemical properties of PAEs have also been investigated with oligomeric model compounds [67-76]. 

S. Barlow, A. L. Rohl, and D. O Hare, J. Chem. Soc., Chem. Commun., 257 (1996). Molecular-Mechanics Study of Oligomeric Models for Poly(ferrocenylsilanes) Using the... 

Oligomeric model compounds were synthesized in order to predict properties of the poly (9,10-anthrylene vinylene), some without any alkyl substitution (dimmer [13], trimer [14]) and others with alkyl substituents (dimer with methyl in 1,4-position, trimer to heptamer with partly substitution of pentyl in 2,3-position [12]). Investigations on those model compounds made clear that exceptional charge-storage properties and... 

BIR Biros, J., Pouchly, J., and Zivny, A., A calorimetric investigation of interactions in aqueous solutions of poly(oxyethylene) 1. Heats of mixing of oligomeric models, Makromol.Chem., 188, 379, 1987. 

In later work, Lattimer et al. identified eight oligomeric series in a commercial version of poly-TMDQ by using the LC/FD-MS combination. Components of f-octylphenol/formaldehyde resins were also characterized using this method. In a series of studies, ozonation products of several p-phenylenediamine compoimds (rubber antiozonants) were separated by LC and identified by using FD-MS. In another study, model "efficient vulcanization" products were separated by colunm chromatography and characterized by FD-MS. "... 

An exception to difficult-to-model filled systems is provided by the norbomene-POSS pol5miers studied by Bharadwaj and co-workers (278). POSS is polyhedral oligomeric silseqiuoxane—groups that are pendant from the poly(norbornene) chains of the model. This can be viewed as a filled system, but one in which the filler is nanoscopic and chemically bonded to the chains. The simulations were done to determine Tg, density, thermal expansion, solubility parameter, POSS mobilities, and elastic moduli in a wide-ranging study. They conclude that the ponderous nature of the POSS moieties is largely responsible for the reinforcing effect. 

Rulkens R, Ni Y, Lough AJ, Manners I (1994) Anionic ring-opening oligomerization and polymerization of silicon-bridged [l]ferrocenophanes characterization of short-chain models for poly(ferrocenylsilane) high polymers. J Am Chem Soc 116 797-798... 

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