Performance of Dynamically Vulcanized Thermoplastic Elastomer under Vibration Force Field

Abstract

The mechanism of vibration force field on dynamically vulcanized thermoplastic elastomers (TPE) is studied through the analyses of their mechanical properties, DSC, XRD, and TGA. Experimental results show that the tensile strength, tensile stress at 100%, and elongation at break of TPE increase within a certain range, but shore A hardness decreases with the increase in the vibrational frequency or amplitude. With the increase in the rubber and plastics ratio, the tensile strength, tensile stress at 100%, and shore A hardness of TPE decrease, but elongation at break increases. The mechanical properties of TPE processed in dynamic condition are better than those in steady condition. The interpenetration and entanglement of macromolecular chains between ethylene-propylene-diene terpolymer (EPDM) and polypropylene (PP) under vibration force field strengthen, the influence of amorphous component on the crystallinity of crystalline component increases, and the miscibility of two-phase interface increases. Therefore, introduction of vibration force field can improve the melting temperature, resistance to heat, and thermal stability of TPE, reduce the crystallinity of crystalline component PP, and increase vulcanization rate. Shearing and elongational effect of vibration force field strengthens deformation, fracture, fineness, and dispersion of EPDM in matrix PP, and side effect of over-vulcanization or degradation caused by local high temperature reduces, which enhances phase inversion of blending systems and realizes processing control of dynamic vulcanization, mixing dispersion, and reactant performance.

Super-hydrophobic and super-oleophilic surface based on high-density polyethylene/waste ground rubber tire powder thermoplastic elastomer

“…1,2 Currently, the creation of super-hydrophobic surfaces, with water contact angle larger than 150 and sliding angle less than 10 , has stimulated great interest due to the significance of the super-hydrophobic surfaces in fundamental research 3,4 and industrial applications, such as water repellency, 5 self-cleaning, 6 anti-icing properties, 7 anti-fouling surfaces 8 and insulations. 9 Recently, Liu et al 10 have fabricated super-hydrophobic surfaces based on thermoplastic vulcanizate via molding process, and vulcanizates [11][12][13][14] were also used to prepare super-hydrophobic surfaces; various super-hydrophobic surfaces based on thermoplastic elastomers (TPEs) have been reported; however, until now there is few report of TPEs involving both super-hydrophobic and super-oleophilic properties, which should be meaningful for the separating of oil/water mixture.…”

Dynamically vulcanized ethylene-methacrylic acid copolymer/nitrile butadiene rubber blends reinforced by zinc dimethacrylate

“…Thermoplastic elastomers (TPEs) are materials which have both the processing behavior of thermoplastics at high temperature and the properties of the ordinary vulcanized rubbers at room temperature. 1,2 Thermoplastic vulcanizates (TPVs), a special type of TPEs, are prepared by dynamic vulcanization process, which was described by Gessler 3 and then developed by Fisher 4 and Coran and Patel. 5 Dynamic vulcanization is a way that is able to vulcanize an elastomer during its melt-compounding with a molten thermoplastic.…”

Morphology, crystallization, and thermal and mechanical properties of dynamic vulcanization EPDM/PP thermoplastic elastomer

“…5 –8 There are three main vulcanization systems for dynamic vulcanization of EPDM in EPDM/PP blends: peroxide vulcanization, sulfur vulcanization, and phenolic resin vulcanization. 9,10 Each of them has its own advantages and disadvantages, for example, the blends with resin vulcanization system show finest particle size of dispersed phase while the sulfur vulcanization system shows coarse dispersed morphology. But the highest storage modulus is related to sulfur vulcanization system.…”