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Tensile strength elastomers

Elastomer Specific gravity Hardness, Shore A Tensile strength, MPa" Elongation, % Resihence Compression e set Impermeability e to gases... [Pg.230]

Desirable properties of elastomers include elasticity, abrasion resistance, tensile strength, elongation, modulus, and processibiUty. These properties are related to and dependent on the average molecular weight and mol wt distribution, polymer macro- and microstmcture, branching, gel (cross-linking), and... [Pg.493]

The particular type of thermoplastic elastomer (TPE) shown in Figure 3 exhibits excellent tensile strength of 20 MPa (2900 psi) and elongation at break of 800—900%, but high compression set because of distortion of the polystyrene domains under stress. These TPEs are generally transparent because of the small size of the polystyrene domains, but can be colored or pigmented with various fillers. As expected, this type of thermoplastic elastomer is not suitable for use at elevated temperatures (>60° C) or in a solvent environment. Since the advent of these styrenic thermoplastic elastomers, there has been a rapid development of TPEs based on other molecular stmctures, with a view to extending their use to more severe temperature and solvent environments. [Pg.472]

Fig. 2. Tensile strength retention, continuous service, for fluorocarbon elastomers. Compound I (see Table 4). Fig. 2. Tensile strength retention, continuous service, for fluorocarbon elastomers. Compound I (see Table 4).
Post-Curing. Post-curing at elevated temperatures develops maximum physical properties (tensile strength and compression-set resistance) in fluorocarbon elastomers. General post-cure conditions are 16 to 24 h at 200 to 260°C. [Pg.514]

Fig. 1. Comparison of fluoroalkoxy FZ, D fluorosiUcone FVMQ, A and fluorocarbon FKM, O, elastomers (a) Tensile strength (b) elongation. To... Fig. 1. Comparison of fluoroalkoxy FZ, D fluorosiUcone FVMQ, A and fluorocarbon FKM, O, elastomers (a) Tensile strength (b) elongation. To...
It is an apparent consequence of the second role that SBS polymers with a molecular mass of about 80 000 behave like carbon-black-reinforced elastomers as illustrated in Table 11.16 in respect of tensile strength. [Pg.298]

Although the elastomer phase is essentially in particulate form, the tensile strength of the blend can be increased five-fold by increasing the cross-link density from zero to that conventionally used in vulcanisation processes, whilst tension set may be reduced by over two-thirds. Since the thermoplastic polyolefin phase may be completely extracted by boiling decalin or xylene, there is apparently no covalent chemical bonding of elastomer and thermoplastic phases. [Pg.303]

In nonrigid ionomers, such as elastomers in which the Tg is situated below ambient temperature, even greater changes can be produced in tensile properties by increase of ion content. As one example, it has been found that in K-salts of a block copolymer, based on butyl acrylate and sulfonated polystyrene, both the tensile strength and the toughness show a dramatic increase as the ion content is raised to about 6 mol% [10]. Also, in Zn-salts of a butyl acrylate/acrylic acid polymer, the tensile strength as a function of the acrylic acid content was observed to rise from a low value of about 3 MPa for the acid copolymer to a maximum value of about 15 MPa for the ionomer having acrylic acid content of 5 wt% [II]. Other examples of the influence of ion content on mechanical properties of ionomers are cited in a recent review article [7],... [Pg.147]

Polyisoprene is a synthetic polymer (elastomer) that can he vulcanized hy the addition of sulfur. cis-Polyisoprene has properties similar to that of natural ruhher. It is characterized hy high tensile strength and insensitivity to temperature changes, hut it has low abrasion resistance. It is attacked hy oxygen and hydrocarbons. [Pg.356]


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See also in sourсe #XX -- [ Pg.75 , Pg.76 , Pg.77 ]




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