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1953 the German chemist K. Ziegler developed a better catalytic system for its production based on titanium halydes and organoaluminum composites. Isotactic Polypropylene was discovered in 1954 by the Italian chemist Giulio Natta, who used a catalyst

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(WO2003053846), membrane for controlling material transport (US2004173506), direct observation of reptation at polymer interfaces (doi: 10.1038/365235a0 ), polypropylene fibers reinforced with carbon nanotubes (doi: 10.1002/app.11160 ) and so on. (4

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