Abstract
AbstractPolymerization of 2,3‐dimethylbutadiene‐1,3 with the Ziegler‐type catalyst Al(i‐C4H9)3‐TiCl4 yields cis‐1,4‐polydimethylbutadiene, when the Al component is in excess, and cyclic polydimethylbutadiene with reduced unsaturation and some trans‐1,4 units in the chain, when the Al/Ti ratio is 1 or less. Similar cyclic polymer is formed in polymerization initiated with acid catalysts such as AlC2H5Cl2. Polydimethylbutadiene obtained with the complex cobalt catalyst Al(i‐C4H9)2ClCoCl2·pyridine is predominantly cis‐1,4 with about 20% of 1,2 units. Radical polymerization at elevated temperature gives high 1,4‐polydimethylbutadiene with both cis and trans units. The polymer obtained by irradiation of dimethylbutadiene at low temperatures is also cyclic with some trans‐1,4 units. Irradiation of dimethylbutadiene in thiourea canal complex leads to relatively high trans‐1,4 polymer. Absorption bands in the infrared spectra at 1125, 1201, and 1251 cm.−1 are typical of cis‐1,4, and bands at 1156, 1227, and 1263 cm.−1 are typical of trans‐1,4, structures.
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 callMore From: Journal of Polymer Science Part C: Polymer Symposia
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
