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Polymers
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A technology of polymers and polymer chains, applied in the field of branched polymers, to achieve an effect that is easy to control and does not require metal catalysis
Pending Publication Date: 2020-01-10
UNIV OF LIVERPOOL
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Although this allows the formation of hyperbranched polymers, this method has some disadvantages
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Embodiment 1
[0244] Example 1 - EGDMA as divinyl monomer and DDT as chain transfer agent
[0245] Thus, in one embodiment, the divinyl monomer is EGDMA, the chain transfer agent is DDT, and a small amount of AIBN is used to provide a source of free radicals. The reaction can be carried out in toluene or other solvents.
[0246] Different ratios of chain transfer agent to divinyl monomer were investigated. A summary of the results is shown in the table below.
[0247] EGDMA – Monomer
[0248] DDT–CTA
[0249] AIBN – thermal initiator
[0250] Toluene – solvent (wt.50%)
[0251] Standard conditions:
[0252] · Oil bath at 70°C
[0253] Response time – 24 hours
[0254] The mass of AIBN is based on 1.5 mol% double bonds in the monomer
[0255]
[0256] a by CDCl 3 middle 1 H NMR (400MHz) measurement.
[0257] b As determined by triple detection GPC
[0258] c Scale up the reaction (3x the previous scale)
[0259] d Mark-Houwink parameter: [η]=KM a
[0260] e The reac...
Embodiment 2
[0265] Example 2 - EGDMA as divinyl monomer and benzyl mercaptan as chain transfer agent
[0266]
[0267] The details are the same as in Example 1, the difference is:
[0268] c The reaction took 72h
[0269] Purification by precipitation was performed using THF and ethanol at 0°C to give a white precipitate.
Embodiment 3
[0270] Example 3 - EGDMA as Divinyl Monomer and 2-Naphthalenethiol as Chain Transfer Agent
[0271]
[0272] The details are the same as in Example 1, the difference is:
[0273] a Cannot be analyzed as it is immiscible in the following solvent chosen: CDCl 3 , toluene and CDCl 3 , DMF and THF.
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Abstract
A method of preparing a polymer comprises the use of free radical vinyl polymerisation to form carbon-carbon backbone segments of the polymer, wherein the longest chains in the polymer comprise vinylpolymer chains interspersed with other chemical groups and / or chains. The product has the characteristics of astep- growth polymer comprising a mixture of polyfunctional step-growth monomer residues formed by vinyl polymerization.
Description
technical field [0001] The present invention relates to polymers and methods for their preparation. The class of materials to which the present invention is concerned includes polymers conventionally prepared by step growth polymerization, including polyamides, polyesters, polyphenylenes (polyphenylenes, polyphenylenes) and polycarbonates. In particular, the present invention relates to branched polymers (branched polymers). Background technique [0002] The step growth polymerization method (step growth polymerization method) is well known and widely used to prepare a range of polymers. They require the reaction of monomers to form small fragments, which are then reacted (with other small fragments or with monomers) to form larger oligomers and eventually higher molecular weight polymers. [0003] Step-growth polymers can use two difunctional monomers (“A 2 " and "B 2 ”), for example, the preparation of diols and diacids, where the desired polymer product is polyester. ...
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