Premium
Cationic polymerization of 1,3‐pentadiene I. infrared, 1 H‐NMR and 13 C‐NMR investigations on the microstructure of poly(1,3‐pentadiene) synthesized with cationic catalysts
Author(s) -
VautrinUl Christine,
Pla Fernand,
Petit Alain
Publication year - 1997
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19971190120
Subject(s) - cationic polymerization , polymerization , cyclohexane , polymer , carbon 13 nmr , polymer chemistry , macromolecule , cis–trans isomerism , chemistry , double bond , crystallography , materials science , stereochemistry , organic chemistry , biochemistry
This study deals with cationic polymerization of the cis ‐ and trans ‐isomers of 1,3‐pentadiene. The microstructure of the polymer chains is studied by 1 H‐NMR, 13 C‐NMR and IR spectroscopies. It is shown that the trans ‐diene gives strictly trans ‐1,4 and trans ‐1,2 residual linear insaturations, whereas the cis ‐isomer yields also cis ‐1,4, cis ‐1,2 and 3,4‐units whose overall content can reach 10 mol‐%. According to the cyclization degree of the macromolecules, ranging from 30 to 70 mol‐%, the number of trans ‐(1,2+1,4) units varies between 33 to 65 mol‐% and that of trans ‐1,2 units between 4 and 20 mol‐%. An analytical method is proposed to evaluate the average number of rings present in the polycyclic sequences. It is found that the cyclic fragments of the polymer chains consist of bi‐ or tri‐cyclohexane fused rings containing α tetrasubstituted double bond.