One-pot process and reagents for preparing long chain branched polymers
A polymer and long-chain branched technology, applied in the field of preparation of long-chain branched polyolefins, can solve problems such as catalyst system difficulties
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Embodiment 1
[0097]The LCB polymer is synthesized according to the method of the present invention, then weighed and analyzed in combination with a variety of analytical methods, including nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and the use of three detectors - including Reflectance, Light Scattering, and Intrinsic Viscosity—Gel Permeation Chromatography (GPC-Triple Detector) to Determine Monomer Conversion, Polymer Composition, Thermal Transition Temperature, Molecular Weight, and LCB Molecular Structure, which will be used in Describe in detail below. For comparison, some control linear polymers were also prepared and tested under the same reaction conditions except that two modified monofunctional T reagents were used, the two "T" reagents containing X or Y functionality to prepare the corresponding backbone and side chains for LCB polyolefins.
[0098] As shown in the figure below, for comparison, two control reactions were made - the two control reac...
Embodiment 2
[0102] Control reaction 1 - using rac-Me 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 / MAO
[0103] Catalyst for the Copolymerization of Propylene and Butenylbenzene
[0104] This control reaction was performed to detect the use of rac-Me 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 Copolymerization activity between propylene and butenylbenzene (V') in the formation of linear propylene / butenylbenzene copolymer (VII') in the / MAO catalyst system. In a dry box, 50 ml of toluene and 1.5 ml of MAO (30 wt% in toluene) were charged into a 450 ml parr stainless steel autoclave with mechanical stirrer. After the reactor was removed from the dry box, 1 ml of butenylbenzene was first injected into it, and then 100 psi of propylene was introduced to make the toluene solution saturated at ambient temperature. Then inject into the reactor containing about 1.25×10 -6 Moore rac-Me 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 toluene solution to start the copolymerization reaction. After 3 minutes, polymerizatio...
Embodiment 3
[0106] Control reaction 2 - using p-butylstyrene (VI') / H 2 rac-Me chain transfer agent 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 / MAO-mediated propylene polymerization
[0107] chain transfer reaction
[0108] In a dry box, 50 ml of toluene and 1.5 ml of MAO (30 wt% in toluene) were charged into a 450 ml parr stainless steel autoclave with mechanical stirrer. After the reactor was removed from the dry box, it was purged with hydrogen (20 psi) and injected with 0.5 ml of p-butylstyrene. The toluene solution was then saturated at ambient temperature with 100 psi of propylene and the total pressure in the reactor was increased to 120 psi. Then inject into the reactor with about 1.25×10 -6 Moore rac-Me 2 Si[2-Me-4-Ph(Ind)] 2 ZrCl 2 solution in toluene to initiate the polymerization reaction. Additional propylene was fed to the reactor throughout the polymerization to maintain a constant pressure (120 psi). After 15 minutes of reaction at 30°C, the polymer ...
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