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Polypropylene block copolymer and its preparation process and use

A polypropylene block and copolymer technology, which is applied to the polypropylene block copolymer and its preparation and application fields, can solve the problems of harsh conditions, difficult reaction control, and difficulty in product purification.

Inactive Publication Date: 2009-08-26
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Synthetic polyolefin block copolymer mainly contains two kinds of methods at present: a kind of is under Ziegler-Natta catalyst or metallocene catalyst catalysis, two kinds of monomers carry out copolymerization (Soga K, Yanagihara H.Macromolecules, 1989,22,2875; Xu Guangguang, Lin Shangan, Acta Polymerica Sinica, 1996, 4(4): 416; Xu Guangguang, Lin Shangan, Acta Polymerica Sinica, 1996, 5(5): 583), but this method is not suitable for polar monomers, polymers The molecular weight cannot be adjusted conveniently, and the product purification is difficult
The second method is to utilize the living polymerization technique, which can precisely control the chain length and the molecular weight distribution of the polymer, such as Chung et al. (B.Lu and T.C.Chung, Macromolecules , 1999,32,2525; T.C.Chung, H.L.Lu, Polymer, 1997,38,1495), coordination polymerization and living anion polymerization have prepared polypropylene block copolymers, but these methods require harsh conditions, The reaction is not easy to control

Method used

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  • Polypropylene block copolymer and its preparation process and use
  • Polypropylene block copolymer and its preparation process and use
  • Polypropylene block copolymer and its preparation process and use

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Example 1. Preparation of polypropylene block polystyrene copolymer

[0073] 1. Preparation of polypropylene terminated with styrene monomer units

[0074] The polymerization was carried out in a stainless steel reactor equipped with mechanical stirring. First, it was pumped with nitrogen gas for three times, and then with propylene gas for two times. Then, 100 ml of toluene, 2 ml of styrene, 2.5 mmol of methylaluminoxane (MAO), 2.5 μmol of dimethylsilyl bis(2-methyl) were added in sequence. -4-naphthyl-indenyl) zirconium dichloride, firstly feed 0.1MPa hydrogen, then feed propylene gas at a certain pressure, and finally keep the pressure of propylene at 0.7MPa, and the polymerization reaction is continued at 35°C for 30 minutes. Then, the material was discharged, precipitated with hydrochloric acid and ethanol, and filtered to obtain a white solid, which was then washed twice with tetrahydrofuran, and vacuum-dried at 60° C. to obtain a polypropylene with a styrene mon...

Embodiment 2

[0079] Example 2. Preparation of polypropylene block poly-p-methyl polystyrene copolymer

[0080] The polymerization was carried out in a stainless steel reactor equipped with mechanical stirring. First, it was pumped with nitrogen gas three times, and then with propylene gas for two times. Then, 100 ml of toluene, 0.1 ml of styrene, 0.01 mmol of methylaluminoxane (MAO), and 0.3 μmol of dimethylsilyl bis(2-methyl) were added in sequence. (base-4-naphthyl-indenyl) zirconium dichloride, first pass 0.1 MPa of hydrogen, and then pass into a certain pressure of propylene gas, and finally keep the pressure of propylene at 0.7 MPa, and the polymerization reaction is continued at 35 ° C for 30 min. Then, the material was discharged, precipitated with hydrochloric acid and ethanol, and filtered to obtain a white solid, which was then washed twice with tetrahydrofuran, and vacuum-dried at 60° C. to obtain a polypropylene containing styrene structural units at the end.

[0081] In a 250...

Embodiment 3

[0084] Example 3. Preparation of polypropylene block polyvinyl acetate copolymer

[0085]The polymerization was carried out in a stainless steel reactor equipped with mechanical stirring. First, evacuated three times with nitrogen gas, and then evacuated twice with propylene gas, and sequentially added 100 ml of hexane, 10 ml of styrene, 50 mmol of methylaluminoxane (MAO), and 50 μmol of dimethylsilyl bis(2-methyl) -4-naphthyl-indenyl) zirconium dichloride, firstly, 0.1MPa hydrogen was introduced, and then a certain pressure of propylene gas was introduced. Finally, the pressure of propylene was kept at 0.7MPa, and the polymerization reaction was continued at 35° C. for 10 minutes. Then, the material was discharged, precipitated with hydrochloric acid and ethanol, and filtered to obtain a white solid, which was then washed twice with tetrahydrofuran, and vacuum-dried at 60° C. to obtain a polypropylene containing styrene structural units at the end.

[0086] In a 250ml three-...

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Abstract

The invention discloses a preparation method and application of a polypropylene block copolymer. The polypropylene block copolymer provided by the present invention has the structure shown in formula I, wherein m is an integer between 100 and 100000; n is an integer between 10 and 5000; R1 is H or methyl; R2 is Phenyl, p-tolyl, -OCOCH3, -CONH2, -CN or -COOR, R is an alkyl group. The polypropylene block copolymer of the present invention has the characteristics of highly adjustable molecular weight and narrow molecular weight distribution, and can also maintain the original excellent properties of polypropylene such as high melting point and high crystallinity. Observed by a scanning electron microscope, the block copolymer obtained in the present invention is added to a blend of polypropylene and other polymers (such as polystyrene, polyacrylates), which can obviously change their blending compatibility, It is a very effective blend compatibilizer of polypropylene and other polymers.

Description

technical field [0001] The present invention relates to polypropylene block copolymer and its preparation method and application. Background technique [0002] Although polyolefins are widely used due to their high cost performance and excellent processability, the lack of reactive groups in polyolefins results in poor adhesion, compatibility with other substances, and poor dyeing properties. The further application of polyolefin materials is greatly limited. Block copolymers and graft polymers are effective compatibilizers that improve the interfacial interactions of polyolefins with other polymeric materials (Teyssie, P., Fayt, R. and Jerome, R. Makromol. Chem. Macromol. Symp. 1988, 16, 41; Favis, B.D., Can. J. Chem. Eng., 1991, 69, 619). [0003] At present, there are two main methods for synthesizing polyolefin block copolymers: one is to copolymerize two monomers under the catalysis of Ziegler-Natta catalyst or metallocene catalyst (Soga K, Yanagihara H. Macromolecule...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F295/00
Inventor 董金勇张辽云范国强郭存悦胡友良黄明宝
Owner INST OF CHEM CHINESE ACAD OF SCI
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