Novel gradient copolymer and preparation method thereof

A gradient copolymer, a new type of technology, applied in the field of polymers, can solve the problems of limited design and research reports

Inactive Publication Date: 2019-03-05
BEIJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But so far, for a wide T g The design and research reports of a range of gradient copolymers are still very limited

Method used

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  • Novel gradient copolymer and preparation method thereof
  • Novel gradient copolymer and preparation method thereof
  • Novel gradient copolymer and preparation method thereof

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preparation example Construction

[0047] One aspect of the present invention provides a method for preparing the above-mentioned novel gradient copolymer with a wide glass transition temperature, wherein the method comprises the following steps:

[0048] Step 1, use monomer M' and monomer N' to polymerize to obtain a gradient copolymer, expressed as M x-grad -N y .

[0049] Wherein, the structural unit M is polymerized from the monomer M', and the structural unit N is polymerized from the monomer N', and x and y represent the degree of polymerization of the structural unit M and the structural unit N, respectively.

[0050] According to a preferred embodiment of the present invention, in step 1, the monomer M' is selected from non-hydrolyzable ethylenic monomers;

[0051] Wherein, preferably, the monomer M' is selected from monomers whose glass transition temperature differs greatly from the glass transition temperature of the monomer N', such as styrene;

[0052] In a further preferred embodiment, the mono...

Embodiment approach

[0059] According to a preferred embodiment of the present invention, the organoantimony-mediated radical polymerization (SBRP) is carried out as follows: using azobisisobutyronitrile as an initiator at 40-80°C.

[0060] In a further preferred embodiment, the organoantimony-mediated free radical polymerization (SBRP) is carried out as follows: using azobisisobutyronitrile as an initiator at 50-80°C.

[0061] In a further preferred embodiment, the organoantimony-mediated free radical polymerization (SBRP) is carried out as follows: using azobisisobutyronitrile as an initiator at 60°C.

[0062] Wherein, the above-mentioned free radical polymerization regulated by organoantimony (SBRP) is free radical polymerization regulated by organoantimony in bulk or in traditional organic solvents.

[0063] According to a preferred embodiment of the present invention, the molar ratio of the initiator to the organic antimony compound is 1:(1-5).

[0064] In a further preferred embodiment, the...

Embodiment 1

[0140] St (8.32g, 80mmol), AIBN (0.0821g, 0.5mmol) and a magnetic stir bar were added to a 50mL Schenk reaction flask, and MA (10.34, 121mmol) was added to another 50mL Schenk flask, both of which were subjected to freezing-pumping Vacuum-fill with argon, cycle three times, remove the air. Add ethyl 2-dimethylantimony-2-methylpropionate (EMSMP) (0.267g, 1mmol) into the first reaction bottle in the glove box, and place it in a pre-set 60°C oil bath for reaction, Then through a micro-syringe pump, at a constant flow rate (0.006mL min -1 ) Add MA monomer dropwise to the bottle. The polymerization reaction stopped 10 minutes after the MA was added dropwise, all the samples were taken out, dissolved in chloroform, and the polymer was precipitated by methanol, and dried in a vacuum oven at 40°C to constant weight to obtain the gradient copolymer St 40 -grad-MA 60 .

[0141] Will St 40 -grad-MA 60 (1g), tetrahydrofuran 20mL, 40% potassium hydroxide solution (1mL), and triethyla...

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Abstract

The invention discloses a novel gradient copolymer and a preparation method thereof. The preparation method comprises the following steps: step 1, polymerizing a monomer M' and a monomer N' so as to obtain a gradient copolymer; and step 2, partially hydrolizing the gradient copolymer obtained in the step 1, and carrying out post-treatment so as to obtain the novel gradient copolymer. Compared withthe gradient copolymer obtained in the step 1, the novel gradient copolymer has wider glass transition temperature range, and has an optimal hydrolysis range to maximize the glass transition temperature range of the gradient copolymer; meanwhile, the novel gradient copolymer has extensive application prospects in the fields of damping materials, surfactants, compatibilizers, etc.

Description

technical field [0001] The invention belongs to the field of macromolecules, and in particular relates to a gradient copolymer and its preparation, in particular to a preparation method of a novel gradient copolymer with a wide glass transition temperature and the obtained novel gradient copolymer. Background technique [0002] Gradient copolymers are generally composed of two different monomers, the structure is between block copolymers and random copolymers, and the composition gradually transitions from one structural unit to another as the molecular main chain prolongs. Structural units dominate. Due to the smooth and continuous change of its molecular chain composition, the interchain repulsion interaction changes smoothly and continuously with the increase of chain length, which makes it have unique thermal properties and interface properties. [0003] Among them, the wide glass transition temperature (T g ) is the difference between gradient copolymers and random co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/14C08F212/08C08F2/38C08F8/12
CPCC08F2/38C08F8/12C08F212/08C08F220/14C08F2800/10C08F2800/20
Inventor 李君和兵黄俐研申震刘正平武英
Owner BEIJING NORMAL UNIVERSITY
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