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Method for preparing polymer in situ alloy by alkene monomer polymerization initiated by plasma surface

A technology of surface initiation and monomer polymerization, applied in the field of preparation of polymer alloys, can solve the problems of less research on polymer/polymerizable monomer reaction processing system, etc., and achieve the effect of simple process

Inactive Publication Date: 2009-06-24
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The in-situ alloying of polymer reaction processing system is not a simple blending between polymers, but is mainly realized by the in-situ formation of interchain copolymers during reaction processing. At present, the reaction to in-situ alloying is also concentrated on polymerization polymer / polymer reaction processing system, there are few studies on polymer / polymerizable monomer reaction processing system, and the relevant research mainly focuses on the ring-opening polymerization and polymerization addition of polymerizable monomers capable of less heat exchange. Reactive monomer blend system

Method used

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  • Method for preparing polymer in situ alloy by alkene monomer polymerization initiated by plasma surface
  • Method for preparing polymer in situ alloy by alkene monomer polymerization initiated by plasma surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Validation of In Situ Initiated Polymerization of Olefinic Monomers

[0028] Take 10g of pure polypropylene pellets, place them in the plasma generator, turn on the power, adjust the power to 20W, the gas medium is carbon dioxide, the flow rate is 50ml / min, discharge for 10 minutes, then take out the polypropylene pellets, Let stand in the atmosphere for 5 minutes. Then the pellets were transferred to a 100 ml three-neck flask, and 20 ml of styrene monomer distilled under reduced pressure was poured into it. The reaction temperature was set at 100° C., and the whole reaction was carried out under argon protection and condensed reflux. After reacting for one hour, take out the three-neck bottle, place it in an ice-water mixture and cool it to room temperature, take out the product, and place it in a beaker filled with 500 ml of ethyl acetate to take out the homopolymerized polystyrene, take it out after 2-3 days , put the remaining material back into a beaker containing...

Embodiment 2

[0032] Validation of In Situ Initiated Polymerization of Olefinic Monomers

[0033] Take 8g of pure polystyrene pellets, put them in the plasma generator, turn on the power, adjust the power to 20W, the gas medium is nitrogen, the flow rate is 50ml / min, discharge for 20 minutes, and then take out the polystyrene pellets , let stand in the atmosphere for 5 minutes. Then the pellets were transferred to a 100 ml three-neck flask, and 30 ml of styrene monomer distilled under reduced pressure was poured into it. The reaction temperature was set at 100° C., and the whole reaction was carried out under the protection of argon and condensed reflux. After reacting for five hours, the three-neck flask was taken out, placed in an ice-water mixture and cooled to room temperature, the product was taken out, placed in a beaker containing 100 ml of ethyl acetate, and fully dissolved. In order to measure the molecular weight of polystyrene initiated in situ, ethyl acetate solution was carrie...

Embodiment 3

[0035] In situ initiation versus thermal polymerization

[0036] According to the method for embodiment 1, the polystyrene that the reaction time is respectively 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, 5 hours and isolates measures the change of viscosity-average molecular weight along with the polymerization time;

[0037] Take 120 ml of styrene monomer that has been distilled under reduced pressure, and conduct thermal polymerization at 100°C. The reaction times are 30 minutes, 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours. Quantitative products are taken out, and polystyrene is separated. Ethylene, measure the change of its viscosity average molecular weight with the polymerization time.

[0038] The viscosity-average molecular weight of polystyrene initiated and thermally polymerized in situ with the change of polymerization time is shown in the appendix figure 2 .

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Abstract

The invention relates to a method for using a plasma surface to initiate alkene serial monomer to prepare in situ alloy of polymer by polymerization. The method comprises the following steps: plasma surface processing is carried out on polymer granule; the processed polymer granules are combined with the alkene serial monomer; under the initiation of surface active substances, the alkene serial monomer is polymerized into polymer with high molecular weight without adding an initiator; the polymerization is initiated at two phase interfaces directly; in addition, in the process, the alkene serial monomer is grafted on the surface of the polymer granule so as to obtain performed polymer series; and the obtained performed polymer series is blended and intermixed so as to lead the whole series to be evenly mixed, thus realizing the combination of in situ reaction and the processing process. The invention is simple, convenient and reliable; the obtained product has stable structure and property, thus being capable of carrying out industrial production.

Description

technical field [0001] The invention relates to the preparation of polymer alloys, in particular to a method for preparing polymer in-situ alloys by initiating the polymerization of ethylenic monomers on the plasma surface. Background technique [0002] Low-temperature plasma chemistry is a new discipline formed in the 1960s on the basis of the interdisciplinary development of physics, chemistry, electronics, and vacuum technology. Plasma, as the fourth state of matter, has long been recognized by people, and the plasma technology formed on this basis has also been widely used in various fields. The so-called plasma refers to the non-condensed system produced by partially ionizing the gas under specific conditions, which is composed of neutral atoms or molecules, excited atoms or molecules, free radicals, electrons or negative ions, positive ions and radiation photons, and On the whole, it behaves as an ionized gas that is approximately electrically neutral. [0003] Plasm...

Claims

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Application Information

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IPC IPC(8): C08L23/12C08L23/06C08L25/06C08L67/04C08L9/00C08L77/00C08L23/02C08L33/00C08L47/00C08L45/00C08L25/00C08F2/52C08F10/00C08F20/00C08F36/02C08F32/06C08F12/02
Inventor 马桂秋翟锦江盛京李景庆
Owner TIANJIN UNIV
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