Polybutylene terephthalate tensile strength

Polybutylene Terepbtbalate Thermoplastic polymer of dimethyl terephthalate and butanediol. Has good tensile strength, dielectric properties, and chemical and water resistance, but poor impact strength and heat resistance. Processed by injection and blow-molding, extrusion, and thermo forming. Used in auto body parts, electrical devices, appliances, and housings. Also called PBT. 

Thermoplastic alloy of styrene maleic anhydride copolymer and polybutylene terephthalate. Has improved dimensional stability and tensile strength. Processed by injection molding. Also called SMA PBT Alloy. 

It is seen in Table 3.1 that polyamide 6 improves its tensile strength from a value of 40 MPa to 145 MPa, that is, by a factor of about 3.6. The improvement obtained by the incorporation of glass fiber into polybutylene terephthalate was even more dramatic, from 52 to 80-196 MPa. Very useful improvements in tensile strength result from the incorporation of glass fiber into the formulation. Such improvements ranged from 17 to 41 MPa on unreinforced polymer to 180 MPa on glass-reinforced polytetrafluoroethylene. 

Reinforced polymers that combine high tensile strength with high flexural modulus include polybutylene terephthalate, polyether ether ketone, polyamide-imide, and polyethylene terephthalate (see Table 3.3). 

As seen earlier, the incorporation of 45% glass fibers into polybutylene terephthalate increases the tensile strength from 52 MPa to values between 80 and 196 MPa (Table 3.1), giving it a superior tensile strength to polyethylene terephthalate. 

Ta b 1 e 5.45 Service temperatures and temperature indices of polybutylene terephthalate relative to 50% reduction in tensile strength after 20,000 and 5,000 h, respectively... 

In general, nonabsorbable sutures can retain their tensile strength longer than 2 months [113]. The synthetic polymers used to make nondegradable sutures include polypropylene (PP), polyamides, polyesters such PET and polybutylene terephthalate (PBT), and polyether-ester based on poly(tetramethylene glycol), 1,4-butanediol, and dimethyl terephthalic acid [114]. The base polymer and filament configuration for common nonabsorbable sutures are summarized in Table 8.2. 

Figure 11.7. Tensile strength of molded polybutylene terephthalate containing variable quantities of N,N -ethylene bis-stearamide. pata from Percell, K. S. Tomlinson, H. H. Walp, L. E., Plast. Eng., 43, 9,33-6,1987.]...

---