Compressive modulus copolymers

Multiwalled CNTs were also used to improve the mechanical properties of polylactide-caprolactone copolymer. The composite with only 2 wt% of MWCNTs showed 100% improvement in the elastic modulus and a 160% enhancement in tensile strength [64]. Others showed significant reinforcement in bofli compressive modulus (74%) and flexural modulus (69%) with only 0.05 wt% of single-walled CNTs [65]. These results demonstrate favorable cytocompatibility for potential use as scafrbld for bone tissue engineering applications. 

Copolymer Tensile modulus (MPa) Tensile strength (MPa) Elongation (%) Izod impact strength (J/m) Compression set/% (70 °C, 22 h)... 

Figure 9. Effect of hard-segment content on storage modulus and loss tangent of compression-molded FTMO/FTMT-segmented copolymers...

However, they can also be transfer or compression molded, solid state formed or thermoformed. PC is the matrix phase in most of these blends. The impact modifier can be PE, ABS or acrylic copolymer, e.g., MBS. The blends show good processability, heat resistance, ductility, HDT, high modulus, impact, tensile and flexural strength over a wide temperature range, good adhesion, solvent, chemical, and UV resistance. They can be painted, hot stamped, metallized and plated. Some blends (containing PB as impact modifier) may have poor weatherability. The blends are mainly used in the automotive industry. 

Fig. 4.179 Compression-relaxation modulus of a poly(oxymethylene) copolymer for various strain levels [12Els].

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