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A random copolymer and its preparation method, modified PBO fiber and its preparation method, resin-based wave-transparent composite material and its preparation method

A technology of random copolymers and composite materials, applied in fiber processing, fiber types, textiles and papermaking, etc., can solve the problem of poor bonding between modified PBO fiber and resin base, uncontrollable polydopamine molecular weight and dispersion coefficient, and reaction time long wait question

Active Publication Date: 2022-03-04
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The commonly used substance for surface modification of PBO fibers is dopamine. This is because dopamine self-polymerizes in alkaline buffer to form polydopamine. The self-polymerization reaction conditions in the process are harsh, the reaction time is long, and the molecular weight and dispersion index (PDI) of the obtained polydopamine are uncontrollable, resulting in the inability to form a uniform copolymer film, which in turn leads to the use of polydopamine-modified PBO fibers for use in The bonding force between the modified PBO fiber and the resin base is poor when the resin-based wave-transparent composite is used, so the mechanical properties of the resin-based wave-transparent composite prepared by dopamine-modified PBO fiber need to be further improved

Method used

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  • A random copolymer and its preparation method, modified PBO fiber and its preparation method, resin-based wave-transparent composite material and its preparation method
  • A random copolymer and its preparation method, modified PBO fiber and its preparation method, resin-based wave-transparent composite material and its preparation method
  • A random copolymer and its preparation method, modified PBO fiber and its preparation method, resin-based wave-transparent composite material and its preparation method

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preparation example Construction

[0046] The present invention also provides a method for preparing the random copolymer described in the above technical scheme, comprising the following steps:

[0047] Mix styrene, glycidyl methacrylate, 4-vinylbenzocyclobutene, RAFT reagent, initiator and reaction solvent, and carry out RAFT polymerization reaction under protective atmosphere to obtain the random copolymer.

[0048] In the present invention, unless otherwise specified, the raw materials used in the present invention are preferably commercially available products.

[0049] In the present invention, the molar ratio of styrene, glycidyl methacrylate and 4-vinylbenzocyclobutene is (30-50): (10-16): (3-4), preferably (30-40): (12-16): (3.5-4), more preferably (30-35): (15-16): (3.8-4).

[0050] In the present invention, the RAFT reagent is preferably 4-cyano-4-[(dodecylsulfanylthiocarbonyl) sulfanyl] pentanoic acid; the molar ratio of the styrene to the RAFT reagent is preferably ( 30-50): (0.1-0.8) More prefer...

Embodiment 1

[0096] 30.0mmol styrene (S), 16mmol glycidyl methacrylate (GMA), 3.0mmol 4-vinylbenzocyclobutene (BCB), 0.1mmol 4-cyano-4-[(dodeca Alkylsulfanylthiocarbonyl)sulfanyl]pentanoic acid (Raft reagent, CTA), 0.06mmol 1,1-azobis(cyclohexanecarbonitrile) and 10mL dichloromethane were added to the round bottom flask, and the Enter nitrogen and seal; put into 70 ℃ oil bath and stir magnetically for 20h, pass the gained RAFT polymerization reaction system through normal hexane (the volume of normal hexane is 600% of the volume of RAFT polymerization reaction system) 3 times, through drying, obtain Regular copolymer P (S-co-BCB-co-GMA), through the peak area of ​​nuclear magnetic spectrum and the productive rate of product, calculate x is 56 in the random copolymer, y is 2, z is 48; The number average molecular weight of the obtained random copolymer measured by permeation chromatography (GPC) was 32300, and the dispersion coefficient was 1.09.

[0097] figure 1 It is the nuclear magnet...

Embodiment 2

[0101] 40.0mmol styrene (S), 12mmol glycidyl methacrylate (GMA), 4mmol 4-vinylbenzocyclobutene (BCB), 0.5mmol 4-cyano-4-[(dodecane Sulfanylthiocarbonyl)sulfanyl]pentanoic acid (Raft reagent, CTA), 0.08mmol 1,1-azobis(cyclohexanecarbonitrile) and 12mL dichloromethane were added to the round bottom flask, passed through Nitrogen and seal. Put it into an 80°C oil bath and stir it magnetically for 28 hours, pass the obtained RAFT polymerization reaction system through n-hexane (the volume of n-hexane is 700% of the volume of the RAFT polymerization reaction system) 3 times, and dry to obtain the random copolymer P (S-co-BCB-co-GMA), wherein x is 55, y is 1, and z is 44, the molecular weight of the obtained random copolymer is 34200, and the dispersion coefficient is 1.17.

[0102] Soak 110 parts by weight of PBO fiber in 90 parts by weight of 6.0wt% P (S-co-BCB-co-GMA) solution (the first organic solvent is dichloromethane), wait for the first organic solvent to evaporate, put it...

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Abstract

The invention belongs to the technical field of organic synthesis, and provides a random copolymer and a preparation method, a modified PBO fiber and a preparation method, a resin-based wave-transmitting composite material and a preparation method. The random copolymer side chain provided by the invention contains epoxy groups, and the 4-vinylbenzocyclobutene side chain cyclobutene of the random copolymer can be crosslinked by heating ring opening, so that the random copolymer A stable polymer network is formed, which has good adhesion to the resin substrate, and the epoxy group of the side chain of glycidyl methacrylate effectively improves the surface activity of the random copolymer, further improving the random copolymerization. Adhesion of the material to the resin matrix. The random copolymer is combined with 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane to modify PBO, and the obtained modified PBO fiber has a good combination with the resin substrate, making the modification The resin-based wave-transparent composite material reinforced with permanent PBO fibers has both excellent mechanical properties and wave-transmitting properties.

Description

technical field [0001] The invention relates to the technical field of organic synthesis, in particular to a random copolymer and a preparation method, a modified PBO fiber and a preparation method, a resin-based wave-transmitting composite material and a preparation method. Background technique [0002] Resin-based wave-transparent composite material refers to high-performance fiber as reinforcement, low dielectric constant (ε) and low dielectric loss tangent (tanδ) resin as wave-transparent matrix, through hand lay-up, vacuum bag, resin transfer Advanced resin-based composite materials with high structural load-bearing and wave-transmitting functions prepared by molding or filament winding molding technology. Resin-based wave-transparent composite materials have the advantages of high specific strength, high wave transmittance, and excellent heat resistance and chemical resistance, and are widely used in aircraft, 5G base stations, printed circuit boards (PCB), filters and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F220/32C08F212/32D06M15/273D06M15/233C08L79/04C08L63/00C08J5/24D06M101/30
CPCC08F212/08D06M15/273D06M15/233C08J5/24D06M2101/30C08J2379/04C08J2479/04C08J2463/00C08F220/32C08F212/32
Inventor 顾军渭唐林唐玉生孔杰张军亮
Owner NORTHWESTERN POLYTECHNICAL UNIV