Tailoring the Properties of Polypropylene Synthesized by 4th generation Ziegler- Natta catalyst with different external electron donors

Propylene polymerization using a 4th generation Ziegler-Natta catalyst in the presence of three different alkoxy external donors (C,P and D) and in the absence of donor were done. The I.Is(%) of three samples synthesized in the presence of donors were close and more than that without donor. The samples synthesized in the presence of donors P and C have the highest viscosity average molecular weight and crystallinity respectively. DMTA analyses for four samples were done and storage modulus and tan delta results showed direct and inverse relationships with crystallinity respectively. Also higher Mv were determined as another key factor for higher damping ability and glass transition temperature. A way for tailor making the properties of polypropylene with different external donors in constant molar ratio of external donor to cocatalyst was investigated

کلیدواژه ها:

External electron donor ، Dynamic and mechanical properties ، Polypropylene ، Crystallinity ، Viscosity average molecular weight