Glass fiber reinforcement impact strength

Heitz et al. [35] (BASF) describe the use of polycarbodiimide as an additive to produce hydrolysis-resistant PBT. Further patents describe glass-fiber-reinforced mixtures of PBT with an aromatic polycarbodiimide having improved impact strength [36], and mixtures of PBT with an aromatic polycarbodiimide having improved melt strength and intrinsic viscosity [37],... 

Izod impact strength is very important characteristic of the engineering plastics.The izod impact strength(notched,J/m) of injection molded test pieces was 92 J/m which was lower than , but higher than those of poly(butylene terephthalate) and glass fiber reinforced . 

Figure 11-18. Fatigue strength under tensile stress (tensile strength) as a function of time for a glass-fiber-reinforced unsaturated polyester (UP), a high-impact-strength poly(styrene) (SAN), poly(styrene) (PS), and poly(ethylene) (PE) (after BASF).

Considerable reinforcement can be achieved by adding glass or chemical fibers. With glass-fiber reinforcement, the tensile, compression, and shear strengths, as well as the impact strength, increase to at least double... 

With GFP, the notched-bar impact strength increases as the temperature rises it falls with temperature in unfilled polymers. The moisture uptake and heat expansion are lowered by glass-fiber reinforcement. The thermal-threshold tensile strength increases, for a glass-fiber-reinforced nylon 6, for example, from 75 to 245°C (at 1.85 N/mm ). 

Figure 4.57 Flexural strength vs. temperature for Celanese Celanex high impact, glass fiber reinforced PBT resins.

Figure 10.78 Charpy Impact strength vs. temperature for BASF Ultrason E 2010 G4— medium viscosity, 20% glass fIber-reInforced PES resins.

Figure 7.8 Comparison of impact strength of glass fiber reinforced engineering thermoplastics. Data on the unfilled resins are included for comparison.

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