Polymer conformation and viscometric behaviour, 3. Synthesis, characterization and conformational studies in poly(mono‐n‐octyl itaconate)

Abstract

The unperturbed dimensions and the steric factor CT of poly(mono-n-octyl itaconate) (poly-(1 -carboxy-1 -octyloxycarbonylmethylethylene)) were determined from the intrinsic viscosities in two solvents, using the semiempirical equation of Stockmayer and Fixman. Evidence for the existence of specific effects was found. The irregular behaviour observed, can be interpreted in terms of conformational changes and conformational transitions of the polymeric chain, induced both by solvent and temperature. The effect of the structure of the monomeric unit on the flexibility of the macromolecule is discussed. 0025-1 16X/85/$03.00 *) 6,5 and 5,9 correspond to C&=C< .

Synthesis, Reactivity Ratios, and Solution Behavior of Vinylpyrrolidone-co-Monoalkyl Itaconate and Vinylpyrrolidone-co-Dialkyl Itaconate Copolymers

“…The thermodynamic and conformational behavior of poly(itaconates) in general has been extensively studied; 1c,− nevertheless, the effect of the polymer chemical structure and its influence in this behavior is not yet clearly understood. The high rigidity of poly(monoitaconates) in comparison with that of poly(diitaconates) has been attributed mainly to the free carboxylic group.…”

“…Depending on the structure of the comonomer, it is possible to vary the intramolecular interactions between unlike units, which influence short- as well as long-range interactions. On the other hand, vinylpyrrolidone (VP) is a monomer frequently used as a comonomer, 11a,− mainly because of its amphiphilic character. In fact, vinylpyrrolydone contains a highly polar amide group which confers hydrophilic and polar-attracting properties.…”

Adsorption Behavior of Amphiphilic Polymers

“…The monomer and polymer were obtained following the experimental procedure previously reported (18).…”

Monoalkylitaconates–vinylpyrrolidone copolymers. 2. Reactivity ratios and viscometric behaviour in dilute solutions

“…To analyse this effect we have determined the rigidity index c for each copolymer, where c is defined as the ratio ( ( r 2 ) o / ( r 2 ) o , ) " 2 . Nevertheless, the most used and appropriate value for comparison of the steric hindrance to rotation in a polymeric chain is the characteristic ratio C,, as defined by Flory:" 112 c, = n+ lim m [g] ( 5 ) with n the number of main chain bonds of mean square length Iz. Table 5 collects the root mean square end-to-end distance for a completely free rotation chain model ( ( r 2 ) 0 f / M ) 1 / Z , the unperturbed dimensions ( ( r 2 ) 0 / M ) 1 / Z , the rigidity factor c and the characteristic ratio C, determined for all the copolymers under study.…”