Abstract
The unperturbed molecular dimensions of atactic and isotactic polypentene-1 were determined by viscosity measurements in θ solvents, in the range 32° to 149°. It can be concluded that: 1. (a) around room temperature, the isotactic chains are more extended than the atactic chains; the volume pervaded by an isotactic molecule under unperturbed conditions is ≈20 per cent larger than that by an atactic chain of the same M; 2. (b) the unperturbed dimensions decrease with increasing temperature for both stereoisomers, but at different rates. It can be calculated: ▪ The results are interpreted; the available data concerning d ln r o 2/d T for atactic polypropylene and polybutene-1 are discussed.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
