pps proceeding - Abstract Preview
pps proceeding
Symposium: S08 - Rubbers and Elestomers
Oral Presentation
 
 

Crosslinking Combination Involving Benzocyclobutene Chemistry for New Generation Tire Tread Compounds

Kulkarni Akshata (1)*, Abdelgawad Ammar (1), Pugh Coleen (2), Jana Sadhan (1)

(1) The University of Akron - Ohio - USA, (2) Wichita State University - Kansas - USA

The aim of the work was to develop a hybrid curative package based on C-S and C-C crosslinks for rubber that would allow crosslinking at lower temperatures and lower curing times from what is usually encountered in rubber industries. The work investigated the synergism in properties (e.g. long-term stress, hysteresis, mechanical set) created by combining covalent benzocyclobutene (BCB) crosslinks with polysulfidic crosslinks. BCB based compounds have been used to crosslink Styrene Butadiene Rubber (SBR). BCB crosslinks via Diels Alder mechanism at temperatures > 220℃. However substituted BCB cures completely at 150℃. Thus, different curative packages involving substituted BCB are developed and compounded with rubber to study the cure characteristics, tensile strength, storage modulus, loss modulus, and crosslinking density. A hybrid curative package involving sulfur and poly (pentafluorostyrene-substituted mono BCB) was developed which reduced the cure time by 15% compared to regular sulfur curing. The effect of the physical state of the curative was also studied by performing curative studies with bis BCB from a divinyl compound and bis BCB with a polybutadiene spacer. Formulations containing carbon black were also prepared and tested in order to investigate the effect of a filled rubber system on the curing characteristics.