Pyrolysis paths of polybutadiene depending on pyrolysis temperature

Abstract

Polybutadiene (BR) was pyrolyzed at 540-860 o C and the effect of pyrolysis temperature on variations in the relative abundance of the major pyrolysis products (C4-, C5-, C6-, C7-, and C8-species) was investigated. Formation of the C4-, C5-, C6-, and C7-species competed with that of the C8-species. Relative intensity of the C8-species decreased with increasing pyrolysis temperature, while that of the C5-, C6-, and C7-species increased. Pyrolysis paths were became more complicated with increasing pyrolysis temperature. We suggested the operation of double bond migration and succeeding rearrangements for the formation of the C5-and C7-species and various rearrangements, including a double bond, for the formation of the C6-species at high temperature. The activation energies for the pyrolysis product ratios of (C5+C6+C7)/C4 and C8/C4 were used to explain the competition reactions to form the pyrolysis products.

Pyrolysis behaviors of poly(acrylonitrile-co-butadiene) with differing microstructures

“…8. The reduced relative intensity of 4-vinylcyclohexene depending on the pyrolysis temperature was also reported in the previous work [10]. The relative intensity ratio of 4-vinylcyclohexene is decreased by increasing the acrylonitrile content of NBR.…”

“…This is due to the reduced butadiene sequences in NBR. The 4-vinylcyclohexene is a butadiene dimer and its formation is needed the butadiene sequence composed of at least two butadiene units directly connected [10]. Therefore, the butadiene sequences required for the formation of 4-vinylcyclohexene are decreased as the acrylonitrile content of NBR increases.…”

“…Kinds and relative abundances of pyrolysis products of polymers are varied with the pyrolysis temperature [8][9][10]. Pyrolysis temperature is a very important factor not only for proper and efficient analysis of polymeric materials but also for recycling of scrap polymeric materials.…”

Synthesis of hydrocarbon polymers containing bulky dibenzobicyclic moiety by ROMP and their characteristic optical properties

“…The thermal decomposition of polybutadiene should lead the formation of butadiene and its Diels-Alder cyclization dimer, 4-vinylcyclohexene. 20,21 Thermal transition temperatures of poly (1) and hydrogenated H-poly(1) were studied by DSC analysis. Poly(1) showed T g of 135 C, while H-poly(1) presented lower T g of 112 C. This is explained by increased flexibility of the saturated main chain of H-poly(1) by the hydrogenation.…”

Influence of sample preparation method and silver salt types on MALDI-TOFMS analysis of polybutadiene

“…13 MALDI analysis of PB has been performed using various matrices and metal salts. 14-16 all-trans-Retinoic acid (RTA) is usually employed as the matrix for analysis of PB and a silver or copper salt is commonly used as the cationizing agent.…”