Effect of 3‐propionylthio‐1‐propyltrimethoxylsilane on structure, mechanical, and dynamic mechanical properties of NR/silica composites

Abstract

Blocked mercaptosilane possessing two functionally active end groups can chemically react with both silica and rubber leading to significant improvement in silicafilled vulcanizate products. The effect of the novel blocked mercaptosilane (3-propionylthio-1-propyltrimethoxylsilane) (called hereafter PXT) on the structure, mechanical, and dynamic mechanical properties of NR/ silica composite were studied. Equilibrium swelling test and scanning electron microscope (SEM) indicate that PXT is able to enhance the crosslinking density of natural rubber (NR)/silica composites and the dispersion of silica in matrix. Mechanical measurement of properties show that PXT can strengthen the reinforcement of silica for NR vulcanizate. In the presence of PXT, the resistance to flex cracking, abrasion and dynamic compression fatigue, and heat build-up of NR/ silica composites can be improved substantially. For the application of automotive tire, it also obtains high-skid resistance and low-rolling resistance simultaneously at 2 phr of the PXT concentration. POLYM. COMPOS., 30:955-961, 2009. ª 957 FIG. 6. SEM photomicrograph of vulcanizates: (a) silica-filled NR without PXT; (b) silica-filled NR with 1 phr PXT; (c) silica-filled NR with 2 phr PXT; (d) silica-filled NR with 4 phr PXT. FIG. 7. Effect of PXT on the hardness and abrasion loss.

The behavior of natural rubber–epoxidized natural rubber–silica composites based on wet masterbatch technique

“…It is believed that heat buildup by compression not only can be used to characterize the resistance to fatigue of composites but can also reflect the filler-matrix network and filler-filler networks. 30 Figure 5 shows a temperature rise by heat buildup after compression of composites. It can be seen that WE composites have lower temperature rises than do DE ones, and the temperature rise of WE composites reduces by 3.2 8C to 14 8C compared to DE composites.…”

“…There are a lot of silanol groups on the surface of the silica particles, which induce strong filler-filler interaction, leading to a strong tendency to filler agglomeration in the rubber matrix. 30 Furthermore, NR is a nonpolar polymer and is incompatible with polar silica particles. Therefore, ENR is employed to improve the interaction between NR and silica and has been proved efficient.…”

Effects of partial replacement of silica with surface modified nanocrystalline cellulose on properties of natural rubber nanocomposites

“…at 0ºC when the NCC was modified. It means that if nanocomposites were applied to the tire tread, low-rolling resistance can be achieved accompanied with maintained skid resistance [6][7]14]. Apparent crosslink density of nanocomposites is shown in Figure 6.…”

“…Silica has always been used as an important rubber reinforcing filler for its excellent reinforcing effect [1][2][3], the capability of reducing the heat build-up [4,5] and rolling resistance of rubber [6,7]. Therefore, silica as an indispensable filler in rubber products has been widely used and investigated.…”

Study on the structure-properties relationship of natural rubber/SiO2 composites modified by a novel multi-functional rubber agent

“…On the other hand, except for the well dispersion of SiO 2 particles, the interfacial adhesion between polymer matrix and SiO 2 particles is another essential factor for the mechanical properties of compos-425 Study on the structure-properties relationship of natural rubber/SiO 2 composites modified by a novel multi-functional rubber agent ites [7], as the weak interfacial adhesion would cause catastrophic damages to the matrix under applied stress. Thus, improvements in the interfacial adhesion between the two phases, as well as good dispersion of inorganic filler particles, have been realized in the preparation of polymer-filler hybrid composites using coupling agents [8]. Nakamura et al [9] investigated the effect of the number of siloxane units on the mechanical properties of polyisoprene/SiO 2 composites by using silanes with dialkoxy and trialkoxy structures.…”