Harshad Ramdas Patil

Alkoxy Silanes as External Donors for Polypropylene Procatalyst: Study on Polymerization Performance and Effect on Resin Properties

Effect of alkoxy silane [R1Si(OR2)3] on propylene polymerization was studied by systematic variation of functional groups e.g R2 = CH3, R1 = ‒OCH3, ‒CH3, ‒(CH2)2CH3, ‒(CH2)3N(CH3)2, ‒(CH2)3N(C2H5)2. Increase in bulkiness of alkyl group from ‒OCH3 to ‒(CH2)3N(C2H5)2 leads to decrease in productivity of catalyst with increase in MFI. Kinetics study revealed reduction of Rp0 and increase in decay kinetic constant with increase in bulkiness of functional groups. Morphology study by SEM of polypropylene particles illustrated that resin particle shape (particle circularity, topography and flowability) have been comparative. Polypropylene particle size distribution study revealed shift toward higher particles size regime for bulkier groups.

Broad Molecular Weight Polypropylene Synthesis using Mixed Internal Donor Incorporated Magnesium Dichloride Supported Titanium Catalyst

Magnesium dichloride supported titanium tetrachloride catalyst with mixed internal donor, comprised of ethylbenzoate and sulfolane, were synthesized. The composition characteristics of catalysts indicate incorporation of sulfolane to max 8.2 wt%, in addition to ethylbenzoate. The amount of incorporated donors in solid catalyst is dependent on the sulfolane concentration and reaction temperature of the process. A physical characteristics study of catalyst indicated that morphology, crystallite size, surface area, pore volume and titanium distribution have not been influenced much by incorporation of the second internal donor (sulfolane). The catalysts, in combination with triethyl aluminum as cocatalyst and p-ethoxyethylbenzoate as external donor, show good activity for propylene polymerization. The polypropylene synthesized with an optimized catalyst system shows broad molecular weight distribution as compared to ethylbenzoate based catalyst.

Titanium Complexes of Tartarate for Ethylene Polymerization

Titanium complexes of tartarate were synthesized by complexation of titanium tetrachloride with tartarate. The isolated products were characterized by compositional, infrared and thermogravimetric analysis. Synthesized complexes in combination with methylaluminoxane as cocatalyst polymerize ethylene to produce high‐density polyethylene. The efficiency of catalysts is found to be dependent on polymerization parameters and nature of cocatalyst. The polyethylene was characterized for melting temperature and molecular weight characteristics by DSC and GPC, respectively.

Synthesis of long chain aliphatic ester and its titanium complexes for ethylene polymerization

Abstract Long chain aliphatic ester, isopropyl myristate, was synthesized using energy efficient microwave irradiation technique. The iso propyl myristate forms complexes with titanium tetrachloride in different mole ratios. The nature of chemical bonding between the titanium and the ester functionality was investigated by FTIR and NMR spectroscopy. The performance of synthesized complexes with methylalumoxane as co-catalyst for ethylene polymerization was found to depend on the nature of complex and polymerization parameters. Molecular weight and thermal characteristics of polyethylene was also investigated.