Effect of fillers and plasticizers on the performance of novel heat and oil-resistant thermoplastic elastomers from nylon-6 and acrylate rubber blends

Abstract

ABSTRACT:The effects of various fillers (SRF black, silica, and clay) and plasticizers (dibutyl phthalate and dioctyl phthalate) on the mechanical, dynamic mechanical, and rheological properties and on the heat and oil resistance of the thermoplastic elastomeric reactive blends of nylon-6 and acrylate rubber (ACM) were investigated. The mixing torque behavior of the blends in Brabender Plasticorder shows reduced extent of interaction between the two component polymers in the presence of both fillers and plasticizers. Silica-filled blends show the highest viscosity increment due to the possibility of reaction between its surface silanol groups and the reactive epoxy groups present in the ACM chain during melt-blending operation. Though the addition of fillers reduces the processability of the blends, it improves the extensibility as well as the tension set properties of the blends. The mechanical integrity and the damping characteristics of the blends are also improved with the addition of fillers; the latter is evidenced from the dynamic mechanical thermal analysis of the blends. The tensile strength and hardness of the filled blends remain practically unchanged after ageing at 175°C for 72 h and, also, the oil swell does not change appreciably with the addition of fillers.

A novel thermoplastic elastomer based on dynamically vulcanized polypropylene/acrylic rubber blends

“…Figure 6 compares the SEM micrographs of PP/ACM (50:50 parts) blends as a function of the compatibilization and vulcanization. The white region corresponds to the rubber phase, which was selectively stained by RuO 4 . Non vulcanized and non compatibilized blend presented a co-continuous structure, with large rubber phase because of the incompatibility between the phases.…”

“…Consequently a fine morphology is usually achieved for these blends, which contributes to an improvement of the overall properties. Some few examples of ACM -based elastomer thermoplastics are reported in the literature and include blends with nylon [4][5][6][7], poly(vinyl chloride) (PVC) [8,9], poly(vinylidene fluoride) (PVDF) [10], poly (ethylene terephthalate) [11] and chlorinated polypropylene [12]. In all these blends, the thermoplastic component is polar, and presents some affinity with the ACM rubber.…”

“…In all these blends, the thermoplastic component is polar, and presents some affinity with the ACM rubber. In the case of nylon or PET/ACM blends, the presence of the epoxide as the cure site monomer in the ACM backbone also provides an effective anchorage between the phases through the reaction between the epoxide groups of ACM and amino or carboxyl groups of nylon and PET, respectively [4,11].…”

Compatibilization efficiency of carboxylated nitrile rubber and epoxy pre-polymer in nitrile/acrylic rubber blends.

“…The best way to achieve commercially viable products with outstanding properties is through the addition of filler and/or blending with other thermoplastic or rubber. Several researchers have reported the use of ACM rubbers in blends with some thermoplastic as nylon [2][3][4][5] , poly (vinyl chloride) [6][7] , ethylene -vinyl acetate (EVA) copolymers [8] , poly(vinylidene fluoride) (PVDF) [9] , poly (ethylene terephthalate) [10] , chlorinated polypropylene [11] and polypropylene [12] , as well as with few rubbers as fluorocarbon rubber [13][14][15][16][17] and natural rubber [18][19][20] . Recently we have reported some results involving mechanical and dynamic mechanical properties of ACM/NBR blends aiming to develop a system with better heat and oil resistance than pure NBR elastomer and better mechanical performance than ACM [21] .…”

Influence of Engage® copolymer type on the properties of Engage®/silicone rubber-based thermoplastic dynamic vulcanizates

“…This is due to the existence of a high interfacial tension between the two polymers. Bhowmick et al [16][17][18][19][20][21][22][23][24] also reported various TPEs and TPVs. Recently Naskar et al [25][26][27][28][29][30] extensively studied the effect of various peroxides including multifunctional peroxides as crosslinking agents in PP/EPDM TPVs.…”