Preparation and swelling properties of solution crosslinked poly(cis‐1,4‐butadiene) gels

Abstract

Poly(cis-1,4-butadiene) (PCB) gels were prepared by the crosslinking polymerization of 4-tert-butylstyrene (tBS) and divinylbenzene (DVB) onto unvulcanized butadiene rubber with a solution polymerization technique with benzoyl peroxide (BPO) as an initiator. The effects of the reaction conditions, such as the amount of the solvent, the amount of DVB and tBS, and the initiator (BPO), on the equilibrium swelling ratio (Q e ) were also investigated. The highest oil absorbencies of crosslinked gels in xylene and cyclohexane were 51.35 and 32.98 g/g, respectively. A swelling kinetic equation was proposed for this system:, where Q t is the swelling ratio at time t, Q 0 is the initial swelling ratio, and K is the swelling kinetic constant. This equation fit the experimental results quite well. The diffusion of organic solvents in PCB gels was Fickian.

A New Approach to Improved Properties of Rubber Vulcanizates Containing White Molybdates

“…These results were confirmed by the formation of such crosslinks, which were determined from the equilibrium swelling measurements through the molecular weight between crosslinks, M c according to the Flory-Rehner relation [13] equation.…”

“…The degree of crosslinking [13] t is given by t ¼ 1=2M c . The obtained data for t are listed in Table 4.…”

“…3) Swelling was determined according to ASTM method D471-97 (1998). It was possible to make use of the swelling data to calculate the average molecular weight between two successive crosslinks (Mc) by the application of the well-known Flory-Rehner equation [12,13] . The crosslinking density can be calculated as:…”

Modification of Acrylonitrile-Butadiene Rubber/Natural Rubber (NBR/NR) Blends with Tetrachloro Phthalic Anhydride

“…According to the equation of Lorentz and Parks [25][26][27] for compatibilized and uncompatibilized vulcanizates…”

Synthesis of crosslinked poly(orthosilicate)s based on cyclohexanediol derivatives and their swelling properties

“…The effects of the reaction conditions on the equilibrium swelling ratio have been investigated, and the highest oil absorbencies are found in xylene and cyclohexane. 30 Kim and coworkers synthesized the crosslinked styrene-acrylate copolymers and specifically investigated their swelling properties. The effect of the various polymerization conditions (for example, initiator concentration, polymerization temperature, crosslinker concentration) and the effect on moisture were studied through the oil absorption test using kerosene oil.…”