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Branched polymers
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A technology of branched polymers and polymers, applied in the field of branched polymers and their preparation
Active Publication Date: 2020-01-07
UNIV OF LIVERPOOL
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Although this allows the formation of hyperbranched polymers, this method has some disadvantages
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[0204] 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.
[0205] Different ratios of chain transfer agent to divinyl monomer were investigated. A summary of the results is shown in the table below.
[0226] The details are the same as in Example 1, the difference is:
[0227] c The reaction took 72h
[0228] Purification by precipitation was performed using THF and ethanol at 0°C to give a white precipitate.
Embodiment 3
[0229] Example 3 - EGDMA as Divinyl Monomer and 2-Naphthalenethiol as Chain Transfer Agent
[0230]
[0231] The details are the same as in Example 1, the difference is:
[0232] 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 branched polymer comprises the free radical polymerisation of a multivinyl monomer in the presence of a chain transfer agent, using a source of radicals, wherein the extent ofpropagation is controlled relative to the extent of chain transfer to prevent gelation of the polymer. The average length of each vinyl polymer chain within the product is short.
Description
technical field [0001] The present invention relates to branched polymers (branched polymers, branched polymers) and a preparation method thereof. In particular, the invention relates to polymers prepared by free radical reactions involving vinyl-containing monomers. Background technique [0002] Many different types of branched polymers are known, as well as many different methods of making branched polymers. [0003] Some branched polymers are cross-linked or gelled, while others are soluble and non-gelled. The present invention generally relates to polymers belonging to the latter group. [0004] The properties and potential applications of branched polymers are determined by several characteristics, including the structure of the polymers, the type of monomers from which they are made, the type of polymerization, the degree of branching, the functional groups on the polymer, the use of other reagents, and the Aggregation conditions. These properties can in turn affec...
Claims
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