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Method for preparing branched polymer

A branched polymer, peroxide technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of peroxide compounds, etc., can solve the speed and degree constraints of branched groups, complex composition, wide molecular weight distribution, etc. problems, to achieve the effect of simple polymerization reaction conditions, high monomer conversion rate and good storage stability

Inactive Publication Date: 2012-09-19
CHANGZHOU UNIV
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  • Abstract
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Problems solved by technology

However, the conditions of living polymerization reaction are very harsh, the cost of polymerization reaction is very high, and the types of monomers that can be adapted are limited.
Compared with living polymerization, the reaction of conventional free radical polymerization is simple and easy, but the composition of the reported conventional free radical polymerization system is complicated, and a large amount of control agent needs to be added; the molecular weight of the synthesized (hyper)branched polymer is not high, and The molecular weight distribution is very wide; the branch point of the product is a chemical weak bond; the branched monomer itself is extremely unstable; the speed and extent of the release of the branched group by the potential branched monomer are restricted by many factors, etc.
These deficiencies seriously restrict the theoretical research and large-scale application of vinyl branched polymers.

Method used

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  • Method for preparing branched polymer
  • Method for preparing branched polymer
  • Method for preparing branched polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add styrene (St 5.2018g, 0.05mol), initiator tert-butyl peroxymethacrylate (0.0396g, 0.25mmol), solvent toluene (1.7325g) into the reaction flask, and react at 85°C for 40 hours, The conversion of styrene was measured to be 82.59%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS =418400, gel permeation chromatography weight average molecular weight M w.GPC =253200, molecular weight distribution PDI=4.72, Mark-Houwink index α = 0.455, see figure 1 Shown by Mark-Houwink curve; average branching factor g '=0.533, confirming that the obtained polymer has a branched structure. branching factor of branched polymers g ′ and molecular weight change trend see figure 2 .

[0033]

Embodiment 2

[0035] Styrene (5.2102g, 0.05mol), initiator tert-butyl methacrylate (0.0393g, 0.25mmol), solvent toluene (1.7288g) were added to the reaction flask, reacted at 60°C for 40 hours, measured The conversion rate of styrene reached 65.31%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS=1284000, gel permeation chromatography weight average molecular weight M w.GPC =460100, molecular weight distribution PDI=4.82, Mark-Houwink index α =0.536, average branching factor g '=0.384, confirming that the obtained polymer has a branched structure.

[0036]

Embodiment 3

[0038] Styrene (5.2099g, 0.05mol), initiator cumyl peroxide (0.0527g, 0.25mmol), solvent toluene (1.7348g) were added to the reaction flask, and reacted at 100°C for 8 hours, The conversion of styrene was measured to be 81.05%. The polymer was analyzed by three-detection gel permeation chromatography, and the results were as follows: light scattering weight average molecular weight M w.MALLS =782100, GPC weight average molecular weight M w.GPC =433900, molecular weight distribution PDI=6.69, Mark-Houwink index α = 0.576, see figure 1 Shown by Mark-Houwink curve; average branching factor g '=0.658, confirming that the obtained polymer has a branched structure. branching factor of branched polymers g ′ and molecular weight change trend see figure 2 .

[0039]

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Abstract

The invention relates to a method for preparing branched polymer and belongs to the field of synthesis of high polymer and preparation of functional polymer. Styrene and other vinyl monomers are initiated to be subjected to self-initiation free radical polymerization reaction at the temperature of between 60 and 100 DEG C by taking methacrylate peroxide containing a polymerizable double bond as an initiating agent, and methylbenzene (benzene, dimethylbenzene) as solvent to successfully form the branched polymer; and the branching degree of the polymer is adjusted by adjusting the molar ratio of the initiating agent to the polymerized monomers. The method is a novel method for preparing the branched polymer, the novel compound containing the polymerizable double bond and a peroxy bond is used as the initiating agent, and branching monomers are not added under the condition of the conventional free radical polymerization so as to successfully prepare the branched polymer. The polymerization reaction is simple and easy to realize, the conversion rate of monomers is high, the branching degree of the polymer can be controlled, and the method is strong in applicability to synthesizing the branched polymer by using various monomers.

Description

technical field [0001] The invention relates to a method for preparing a branched polymer with a novel radical polymerization initiator, and belongs to the fields of polymer synthesis and functional polymer preparation. Background technique [0002] Due to its unique three-dimensional spherical structure, (hyper)branched polymers have characteristics such as low viscosity, high solubility, high functionality, etc., and are considered to be widely used in polymer melt viscosity regulators, preparation of high solid content Coatings and adhesives, drug carriers, catalysts, polymer liquid crystals, optoelectronic materials and many other fields. Its application prospect has attracted the research and attention of a large number of experts and scholars at home and abroad, and has become a hot topic in the polymer discipline. [0003] At present, the methods for synthesizing vinyl branched polymers mainly include living polymerization, conventional free radical polymerization wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F4/34C08F112/08C08F120/14C08F118/08
CPCC08F220/30C08F12/08C08G83/005C07C409/38C07C407/00C08F220/28C08F220/281C08F220/301C08F4/34C08F212/08C08F218/08C08F220/14C08F220/18C08L101/005
Inventor 蒋必彪黄文艳薛小强
Owner CHANGZHOU UNIV
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