Optical rotatory properties of synthetic polymers. I. Optical inversion of poly(propylene oxide)

Abstract

(+)‐1,2‐Diethoxypropane, a model diether for the repeating unit of poly(propylene oxide), was prepared, and its behavior in solutions regarding optical rotatory dispersion and proton magnetic resonance was compared with those of the polymer. It was found that the model compound and the poly(propylene oxide) show essentially the same optical properties in solutions. By using the Brewster model of optical activity, it was concluded that the solvation of the polymer may well modify the polarizability of the optically active species to cause changes in the order of the polarizabilities of four atoms directly attached to the asymmetric carbon atom. The explanation is shown to be applicable also to some of related polymers.

Optical rotation calculations on large molecules using the approximate coupled cluster model CC2 and the resolution-of-the-identity approximation

“…This plot covers 42 of the 50 molecules of our test set. Only the helicene derivatives (31)(32)(33)(34)(35), norbornenone (15), the steroid (30), and cyclooctene (49) have been excluded because of their high optical rotations.…”

Stress-Optical Coefficient of Poly(ethylene oxide) and Poly(propylene oxide) Networks. Measurements

“…It indicates the possibility of a conformational change in an isolated chain surrounded with isotropic solvent media, although there is a divergent opinion. 14 The samples employed contain different linkages and stereoirregularities and these effects on the intrinsic value can not be estimated without the aid of theoretical calculations. In any event, the intrinsic value of ,:JI' seems to be obtainable from measurements in the bulk state for PEO, while care must be taken for PPO even in the swollen state in an isotropic solvent.…”

Toward a detoxification fabric against nerve gas agents: guanidine-functionalized poly[2-(3-butenyl)-2-oxazoline]/Nylon-6,6 nanofibers

“…In addition, no allogra rejection occurs due to the similar solubility parameters (d) of these two polyamides (Nylon-6,6: 23.37 MPa 1/2 , poly[2-(3-butenyl)-2-oxazoline]: 26 MPa 1/2 ), so homogeneous nanobers could be formed. 17,18 This excellent processability provides great convenience for future industry applications, not just for military uniforms but also for conventional ber industries to produce functional fabrics.…”

“…16 Therefore, it is expected that polyoxazolines will have a similar solubility parameter (d) to nylon, which will make it possible to form homogeneous blends of these two polymers. [17][18][19] In addition, the functionality of poly(2-substituted-2oxazoline)s can be tuned simply by varying the 2-substituted functional group of the 2-oxazoline monomer. [20][21][22][23][24][25][26][27][28] The living cationic ring-opening polymerization of 2-substituted-2oxazolines provides easy and direct access to a wide variety of well-dened polymers with large numbers of functional groups.…”