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Polyvinyl acetate grafted copolymer and its free radical/positive ion converting polymerization process

A technology of polyvinyl acetate and graft copolymer, which is applied in the field of graft copolymer and its preparation, can solve the problems of limitation, difficulty in the position and number of active points, difficulty in regulating and controlling the structure of the graft polymer, etc. Easy to control effect

Inactive Publication Date: 2007-11-07
PEKING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] For the method of growing branched chains, due to the use of radiation or light and other initiators, it is difficult to control the position and number of active points on the macromolecular chain, so it is relatively difficult to control the structure of grafted polymers.
The method of macromonomer copolymerization has good control over the structure and grafting rate of the graft polymer, but it needs to synthesize the macromonomer first, which makes the synthesis of the graft polymer complicated.
However, in the current method of grafting branched chains, since the initiating system of the cationic active polymerization system is only effective for one or one type of monomer, the application of the monomer surface is limited.

Method used

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  • Polyvinyl acetate grafted copolymer and its free radical/positive ion converting polymerization process
  • Polyvinyl acetate grafted copolymer and its free radical/positive ion converting polymerization process
  • Polyvinyl acetate grafted copolymer and its free radical/positive ion converting polymerization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The synthesis of embodiment 1 MOS / CHO / PVAc-OH system graft polymer

[0050] 1. Raw materials

[0051] MOS: p-methoxystyrene (CH 2 = CHC 6 h 4 OCH 3 )

[0052] CHO: cyclohexene oxide (C 6 h 10 O)

[0053] AIBN: azobisisobutyronitrile, free radical initiator

[0054] Ph 2 IPF 6 : Diphenyliodohexafluorophosphate, electron acceptor

[0055] PVAc-OH: Partially hydrolyzed polyvinyl acetate

[0056] (the degree of polymerization is 220, Mn=1.9×10 4 , the hydroxyl content is 16%, Kuraray Corporation)

[0057] 2. Graft polymerization reaction

[0058] Add all the monomers, free radical initiators and electron acceptors into the polymerization tube according to the proportions in Table 1, and seal the tube after degassing with liquid nitrogen vacuum circulation for several times on the vacuum line (or after 10 minutes of nitrogen gas), Polymerization was then carried out at a temperature of 80° C. for four hours.

[0059] Numbering

MOS

/ M

...

Embodiment 2

[0070] Embodiment 2 The control (adjusting the ratio of MOS / CHO and PVAc-OH) of MOS / CHO / PVAc-OH system graft polymer composition

[0071]Add all the monomers, free radical initiators and electron acceptors into the polymerization tube according to the proportions in Table 4, degas the tube with liquid nitrogen on the vacuum line for several times, seal the tube, and then put it under the temperature condition of 80 ℃ Polymerize for four hours.

[0072] Numbering

MOS

/ M

CHO

/ M

AIBN

/ mM

Ph 2 IPF 6

/ mM

PVAC-OH

/ g

Yield / g

1

2

3

4

5

6

0.7

1.05

1.4

1.4

1.4

1.4

1.5

2.25

3.0

3.0

3.0

3.0

12

12

12

12

12

12

24

24

24

24

24

24

0.1

0.1

0.1

0.08

0.06

0.04

0.19

0.27

0.31

0.32

0.27

0.27

[0073] Polymerization ...

Embodiment 3

[0079] The synthesis of embodiment 3 AN / BVE / CHO / PVAc-OH system graft polymer

[0080] raw material:

[0081] AN: acrylonitrile (CH 2 =CHCN)

[0082] BVE: Vinyl butyl ether (CH 2 = CHOC 4 h 9 )

[0083] CHO: cyclohexene oxide (C 6 h 10 O)

[0084] AIBN: azobisisobutyronitrile, free radical initiator

[0085] Ph 2 IPF 6 : Diphenyliodohexafluorophosphate, electron acceptor

[0086] PVAc-OH: Partially hydrolyzed polyvinyl acetate

[0087] (the degree of polymerization is 220, Mn=1.9×10 4 , the hydroxyl content is 16%, Kuraray Corporation)

[0088] Add all the monomers, free radical initiators and electron acceptors to the self-made glass polymerization tube according to the ratio in Table 7, change the amount of different PVAc-OH on the vacuum line, degas with liquid nitrogen vacuum cycle for many times, and then seal the tube. tube, and then polymerized at 80°C for 4 hours.

[0089]

No.

AN

/ M

BVE

/ M

CHO

/ M

A...

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Abstract

The present invention discloses one kind of polyvinyl acetate grafted copolymer and its free radical / positive ion converting polymerization process. The polyvinyl acetate grafted copolymer has side chain grafted to the main chain of polyvinyl acetate, and features that the side chain is styrene derivative, vinyl carbazole homopolymer or olefin monomer copolymer. The polyvinyl acetate grafted copolymer is prepared through a free radical / positive ion converting polymerization process, and the process can prepare the copolymer in only one step and control the structure of the copolymer effectively.

Description

technical field [0001] The invention relates to a graft copolymer and a preparation method thereof, in particular to a polyvinyl acetate graft copolymer and a free radical / cation conversion polymerization method thereof. Background technique [0002] Graft copolymer is a kind of polymer surfactant, which can be widely used in the preparation and modification of polymer composite materials. At present, the main principle of the synthesis method of grafted polymers is to generate grafting points on the polymer chain through various mechanisms. According to the generation methods of grafting points and branch chains, the grafting methods generally fall into the following categories: [0003] 1) Growing branched chains: First, an active point is formed in the middle of a certain macromolecular chain, which then triggers the polymerization of another monomer to grow branched chains. There are many reports on this method in the literature, such as the modification of cellulose an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F263/00
Inventor 郭海清赖仁福
Owner PEKING UNIV
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