| Abstract: | The root-mean-square end-to-end distances of isotactic poly(tert-butylethylene oxide) fractions were determined in xylene at 80°C from intrinsic viscosity measurements and in o-dichlorobenzene at 80 and 100°C by light scattering. The characteristic dimension (〈L2〉0/M)1/2 was 1.04 × 10?8 cm in xylene and 0.9 and 0.7 × 10?8 cm in o-dichlorobenzene at 80 and 100°C, respectively. The value in xylene corresponds to a C∞ of 15.9. This observation and the large negative temperature coefficient of (〈L2〉0/M)1/2 suggest that poly(tert-butylethylene oxide) exists in a helical block conformation under these experimental conditions. This conclusion is in agreement with earlier reported NMR measurements. |
