An innovative TPV two‐phase polymeric system is described. The new TPV is composed of a polypropylene (PP) matrix in which a metallocene‐type ethylene/octene copolymer (EO) is dispersed. The EO‐copolymers are grafted with vinyl organosilanes, then blended with PP, hydrolyzed and water‐crosslinked in a co‐rotating, intermeshing twin‐screw extruder. The resulting TPV‐grades are easy to process into articles showing an attractive range of properties. The advantages are due to blend composition and crosslinking concept. The new TPV's can be‐processed without pre‐drying. Molding are characterized by excellent surface quality and absence of odor as a result of the innovative use of the EO elastomer and the modified crosslinking concept. They can easily be colored to any desirableshade. The reduced cost of ingredients is another advantage of the newly developed thermoplastic elastomers. High ultimate strength (σR) and elongation‐at‐break (εR) values as well as a broad spectrum of different Shore A grades open up many new fields of application. The main focus has been on the automotive applications not least because of very low fogging rates.
This contribution aims at the illustration of the potential of reactive blending, hold up polypropylene modification as an example. Formulation rules and process technology to create PP/PA‐alloys and thermoplastic elastomers based on PP/EP(D)M, as well as the property profiles of the resulting products will be described. A separate chapter is dedicated to functionalization of polypropylene by mainchain‐grafting of selected linkage molecules, to widen the range of application of this low‐cost polymer.
The microhardness of injection-moulded i-polypropylene/polyamide (iPP/PA) blends prepared by reactive compounding was determined. The formulation rules and processing technology for the preparation of these alloys was reported previously, iPP/PA compositions between i00/0 and 50/50 using functionalized PP with various degrees of mainchain grafting, were investigated. It is shown that the deviation of microhardness from the additivity law of the single components is mainly due to a decrease in the crystallinity of the iPP phase. The results are discussed in the light of the microstructural variations as revealed by X-ray diffraction methods.
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