Tensile modulus with glass content

The theoretical variation in tensile modulus, shear modulus and Poisson s ratio with glass content is shown in Figure 4.7 for comparison. 

Figure 4.7 Theoretical variation in tensile modulus (E), shear modulus (C) and Poisson s ratio (v) with glass content (Vetrotex).

Thermoplastics grades have a norbomene content in the range 60-80% with Tg values from 60-180°C, in this range the glass transition being almost linearly related to the norbomene content. The modulus of elasticity increases with norbomene content and for commercial materials is in the range 2600-3200 MPa but density (1.02g/cm), tensile strength 66 MPa and water absorption (<0.01 %) is little affected by the monomer ratio. 

Anisotropy Increased with Increasing Integral chopped strand content for tensile strength and flex modulus of RRIM urethane panels. Higher glass content results In higher viscosity which causes well-defined flow and hence well-defined orientation. 

Finally, the ethylene/norbornene copolymers obtained using the nickel catalysts are essentially indistinguishable from those obtained using metaUocene-based early transition metal catalysts, both in terms of the microstructure and such physical properties as Tg and tensile modulus. For the ethylene/norbornene polymers synthesized, the glass transition temperature (Tg) increases smoothly with increasing norbornene content. 

Mantia et al. [70] used short glass fibers to reinforce a PET/HDPE mixture (Table 16.9), which is one of the typical compositions in packaging waste. The mechanical properties of the blends, except for the elongation at break, are enhanced with the increase of glass fiber content. The addition of 20 wt % glass in PET/HDPE blends increased the tensile modulus by 50%, tensile strength by 110%, and impact strength by 70%. In addition, the heat distortion temperature of the blend was remarkably improved. 

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