Unique Behavior of Hydrocarbon Resin Tackifier on Unaged and Aged Tack of Brominated Isobutylene-co-p-methylstyrene (BIMS) Rubber

Abstract

Publication details, including instructions for authors and subscription information: http://www.tandfonline.com/loi/ AbstractThe effect of hydrocarbon resin tackifier on autohesion of brominated isobutylene-co-p-methylstyrene (BIMS) rubber was investigated by a 180 • peel test. The tack strength increased with resin (tackifier) loading up to 10 phr beyond which it dropped. At 10 phr resin concentration, the tackifier enhanced the self-bond formation by enhancing the chain mobility across the interface and, in turn, by providing greater separation resistance from the diffused chains. These conclusions were derived from measured maximum tensile stress, compression creep and viscoelastic properties of the rubber-resin mixtures. The tack strength of neat BIMS rubber showed t 1/2 dependence with respect to increasing contact time (t). On the other hand, the tack strength of the resin loaded sample showed t 1/4 time dependence on contact time. Although the results from dynamic mechanical analysis (DMA) studies suggested good compatibility between the blend components, morphological studies revealed migration of the tackifier to the rubber surface. Upon aging at 100 • C for 36 h, the values of tack strength of both the neat BIMS rubber and the BIMS/tackifier blends significantly decreased. The reduced tack strength of the aged samples was attributed to the changes in compression creep, maximum tensile stress and viscoelastic properties of the samples after aging. Upon aging, the resin loaded samples exhibited excessive blooming of the tackifier onto the rubber surface.

Efficacy of Novel Nanoclay in Autohesive Tack of Brominated Isobutylene-co-p-Methylstyrene (BIMS) Rubber

“…2000 or less [2,4,5]. Tackifying resins impart good tack to elastomers by modifying the viscoelastic properties of the base elastomer in favor of bond formation and bond breaking resistance [5][6][7][8][9][10]. Or in other words, when tackifying resin is present, resistance to flow of the adhesive is reduced at lower frequencies; hence bond formation is facilitated during tack test.…”

“…Moreover, brominated isobutylene-co-p-methylstyrene (BIMS) rubber is a fairly new commercial rubber for a number of industrial applications, both in tire and non-tire areas. In the tire sector, it is used as a major component in tire tubes, sidewalls and inner liners and its tack properties are important for the success of their applications [7][8][9][10]. Therefore, it is worth investigating the effect of MMT nanoclay on the tack and green strength of BIMS rubber.…”

Autohesion Behavior of Brominated-Isobutylene-Isoprene Gum Nanocomposites with Layered Clay

“…4,10,11,25,26 On the contrary, adding nanoclay content above 8 phr, sufficiently improved the green strength of the specimen without the material losing its original interdiffusion or contact flow properties fully. According to Kumar et al, 8 it is well-known that the addition of reinforcing fillers will increase the green strength of synthetic elastomers and can reduce the contact flow and extent of diffusing rubber molecules at the tack junction. If the reduction in contact flow dominates over the enhancement in green strength, there will be reduction in the tack strength.…”

“…[4][5][6] On the other hand, low molecular weight tackifying resins are added to synthetic elastomer compounds to enhance tack and to prevent tack decay. 4,[6][7][8] Similar to the action of oil, tackifying resins also reduce the entanglement density of the base elastomer, however, the interdiffused chains diluted with tackifiers resist separation significantly more than those diluted with oil. 6,8 It has also been reported that the addition of reinforcing fillers like carbon black can influence the tack strength of elastomers.…”

“…4,[6][7][8] Similar to the action of oil, tackifying resins also reduce the entanglement density of the base elastomer, however, the interdiffused chains diluted with tackifiers resist separation significantly more than those diluted with oil. 6,8 It has also been reported that the addition of reinforcing fillers like carbon black can influence the tack strength of elastomers. [9][10][11][12][13] For instance, addition of 40 phr of carbon black to natural rubber (NR) resulted in a significant increase in the tack strength of NR.…”