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Method for modifying styrene-butadiene-styrene (SBS) block copolymer

A technology of styrene block and butadiene, which is applied in the field of modification of styrene-butadiene-styrene block copolymer, can solve problems such as easy degradation, low grafting rate, complicated process, etc., and achieve high performance The effect of raising the glass transition temperature

Inactive Publication Date: 2013-02-27
SHANGHAI JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the above four methods all have disadvantages such as low grafting rate, complex process and easy degradation of SBS, and the types of functional groups that can be introduced are limited.

Method used

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  • Method for modifying styrene-butadiene-styrene (SBS) block copolymer
  • Method for modifying styrene-butadiene-styrene (SBS) block copolymer
  • Method for modifying styrene-butadiene-styrene (SBS) block copolymer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Dissolve 1.32g of SBS and 8.73g of 3-mercaptopropionic acid in 60mL of dioxane, and stir evenly at 25°C; then add 0.13g of azobisisobutyronitrile and disperse evenly, heat up to 60°C and react for 24 Hour. After precipitation, suction filtration and drying, carboxylated SBS was obtained. figure 1 It is the proton nuclear magnetic resonance spectrum of the SBS of gained carboxylation, as can be seen from the hydrogen nuclear magnetic resonance spectrum, butadiene 1 in the carboxylated SBS, 5.37ppm place hydrogen atom on the cis double bond of the 4 structure, 1, the trans double bond of the 4 structure The hydrogen atom at the upper methyl group, the hydrogen atom at 5.54ppm of the 1,2 double bonded methine, the 4.92ppm of the 1,2 double bonded methylene, and the chemical shift of the hydrogen atom at 4.98ppm are completely disappeared relative to SBS, and sulfur is produced at the same time There are 2.72ppm and 3.71ppm methylene signals on both sides of the atom, so i...

Embodiment 2

[0033] Dissolve 1g of SBS and 24.79g of mercaptopropyltriethoxysilane in 48mL of dioxane, stir well at 25°C; then add 0.17g of azobisisobutyronitrile and disperse evenly, heat up to 60°C Reaction 24h. After precipitation, suction filtration and drying, triethoxy-functionalized SBS was obtained. The triethoxy-functionalized SBS can undergo sol-gel reaction by itself or with tetraethyl orthosilicate, and the mesoporous silica material can be obtained after removing the polymer through high-temperature degradation. image 3 It is the hydrogen nuclear magnetic resonance spectrum of the obtained product. From the hydrogen nuclear magnetic resonance spectrum, it can be seen that the hydrogen atom at 5.37ppm on the cis double bond of the butadiene 1,4 structure in the triethoxy functionalized SBS, and the trans double bond of the 1,4 structure The hydrogen atom at the methyl group on the bond, the hydrogen atom at 5.54ppm of the 1,2 double bonded methine, the 4.92ppm of the 1,2 doub...

Embodiment 3

[0035]Dissolve 2.10g of SBS and 17.53g of mercaptoethanol in 90mL of dioxane, and stir evenly at 25°C; then add 0.17g of azobisisobutyronitrile and disperse evenly, heat up to 60°C for 24h. After precipitation, suction filtration and drying, hydroxylated SBS was obtained. The conversion rate of this reaction is 100%. Compared with SBS, the presence of a large number of hydroxyl groups increases the polarity of SBS, thereby enhancing the compatibility of SBS with polar polymers and oligomers. Figure 4 It is the proton nuclear magnetic resonance spectrum of the SBS of gained hydroxylation, as can be seen from the hydrogen nuclear magnetic resonance spectrum, butadiene 1 in the hydroxylated SBS, the hydrogen atom at 5.37ppm on the cis double bond of the 4 structure, 1, the trans double bond of the 4 structure The hydrogen atom at the upper methyl group, the hydrogen atom at 5.54ppm of the 1,2 double bonded methine, the 4.92ppm of the 1,2 double bonded methylene, and the chemical...

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Abstract

The invention relates to a method for modifying a styrene-butadiene-styrene (SBS) block copolymer. In the method, a sulfydryl-vinyl addition reaction is adopted to carry out modification of various functional groups on SBS, so that the aim of carrying out modification of various functional groups on the SBS is fulfilled. Compared with the prior art, various performances of the obtained modified SBS are improved. For example, compared with the glass-transition temperature of original SBS, the glass-transition temperature of the carboxylic SBS is improved by 46 DEG C. The method disclosed by the invention is simple. The reaction has high efficiency. The method is convenient for large-scale production. The prepared modified SBS has wide application prospect, can be directly used as a polymer with high performance and can also be used as a modifier of other polymer materials, for example, a compatibilizer of asphalt polymer blend systems such as polycarbonate, polyester, nylon, polyurethane, polyvinyl chloride and the like.

Description

technical field [0001] The invention belongs to the field of polymer material science, and in particular relates to a modification method of a styrene-butadiene-styrene block copolymer. Background technique [0002] Polystyrene-polybutadiene-polystyrene triblock copolymer (SBS) is an important polymer material, which has the advantages of good elasticity, high strength, low temperature resistance, etc., and is a thermoplastic elastic material with excellent performance. Body; SBS is also an important modifier widely used in plastics and rubber processing, adhesives and other fields. In recent years, SBS has been applied to asphalt modification to improve road water resistance and weather resistance. However, SBS has the disadvantages of oxygen resistance, ozone resistance, and poor aging resistance, so people have been seeking to modify SBS to obtain high performance. The modification of SBS mainly went through three generations of development: the first generation of SBS ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F236/10C08F212/08C08F8/34C08F8/42
Inventor 郑思珣于人同
Owner SHANGHAI JIAOTONG UNIV