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Carbon nanotube modified thermoplastic elastomer composite material with solvent resistance and preparing method thereof

A thermoplastic elastomer, carbon nanotube modification technology, applied in the field of polymer materials, can solve the problems of low strength, easy aging, weak solvent resistance, etc., to achieve good solvent resistance, simple preparation method, and excellent mechanical properties. Effect

Inactive Publication Date: 2016-05-25
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Styrenic thermoplastic elastomer SBC (TPE-S) has the characteristics of plastic and rubber due to the physical crosslinking of the PB phase, so it is called "third-generation synthetic rubber"; on the one hand, SBC (TPE-S) materials It has the characteristics of excellent tensile strength, large surface friction coefficient, good low temperature performance, excellent electrical properties and good processing performance, and does not need to be cross-linked when used. It is currently the most consumed thermoplastic elastomer. On the other hand, SBC (TPE- S) materials such as SBS (polystyrene-butadiene-styrene) and SIS (polystyrene-isopropylene-styrene) have disadvantages such as low strength and easy aging
Although thermoplastic elastomers can be molded and used without cross-linking, this non-cross-linking structure also makes the material have weak solvent resistance and can be dissolved by organic solvents

Method used

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  • Carbon nanotube modified thermoplastic elastomer composite material with solvent resistance and preparing method thereof
  • Carbon nanotube modified thermoplastic elastomer composite material with solvent resistance and preparing method thereof
  • Carbon nanotube modified thermoplastic elastomer composite material with solvent resistance and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve and disperse the elastomer material modified by furan grafting (here the SBS with furan grafting amount of 20%) and carbon nanotubes (the contents are respectively 1%, 2.5%, 5%, 7.5% and 10%) In a solvent, heat and disperse evenly, and then form a film at 100°C. figure 1 is an equation for the reaction between furan-modified SBS (polystyrene-butadiene-styrene) and carbon nanotubes.

[0023] figure 2 It is the stress-strain curve figure of the composite material that the furan graft ratio is 20% and the composite material of different carbon nanotube additions in embodiment 1, and the carbon nanotube addition content is respectively 1%, 2.5%, 5%, 7.5% and 10%.

[0024] Table 1 is the SBS whose furan grafting ratio is 20% in the embodiment, and the carbon tube grafting amount is 1%, 2.5%, 5%, 7.5% and 10% the elongation at break and the modified SBS of reversible crosslinking Breaking strength.

[0025] Table 1

[0026] Addition amount of carbon tu...

Embodiment 2

[0028] Dissolve and disperse the elastomer material modified by furan grafting (30% SBS with furan grafting amount) and carbon nanotubes (1%, 2.5%, 5%, 7.5% and 10% respectively) In a solvent, heat and disperse evenly, and then form a film at 100°C.

[0029] image 3 It is the stress-strain curve figure of the composite material that different furan graft ratios are 30% SBS (polystyrene-butadiene-styrene) and different carbon nanotube additions in embodiment 2, carbon nanotube addition content is respectively 1%, 2.5%, 5%, 7.5% and 10%.

[0030] Table 2 is the elongation at break of the reversibly cross-linked modified butadiene rubber of 30% SBS with furan grafting ratio in the examples, and 1%, 2.5%, 5%, 7.5% and 10% of carbon tube grafting rate and breaking strength.

[0031] Table 2

[0032] Addition amount of carbon tubes (%)

Embodiment 3

[0034] Soak the molded composite material in xylene and heat it to 150°C. At this time, the material dissolves. The solution is poured on a glass plate to form a film, which means that it is reshaped and reused. Taking a composite material with a furan grafting rate of 20% and a carbon nanotube addition of 10% as an example, the molding was repeated three times. The stress-strain curve is shown in Figure 4 . After the material is remolded each time, the breaking strength, elongation at break and modulus all decrease. The analysis is considered to be due to the fact that there is a small amount of residual carbon tubes and the crosslinking between the polymer does not Complete unraveling leads to a decrease in the degree of cross-linking of the reshaped material, so several parameters are decreased. But it still has good mechanical properties.

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Abstract

The invention discloses a carbon nanotube modified thermoplastic elastomer composite material with a solvent resistance and a preparing method thereof. A modified thermoplastic elastomer and carbon nanotubes are dissolved in an organic solvent, heated, stirred uniformly and molded at high temperature to obtain the carbon nanotube modified thermoplastic elastomer composite material with the solvent resistance. According to percent by weight, the carbon nanotube modified thermoplastic elastomer composite material with the solvent resistance is prepared from 90-99% of modified thermoplastic elastomer and 1-10% of carbon nanotubes. The carbon nanotube modified thermoplastic elastomer composite material with the solvent resistance has excellent mechanical properties and solvent resistance, is of a crosslink structure and cannot be dissolved at normal temperature and keeps a remolding characteristic at high temperature. The carbon nanotubes can be recycled separately as per required, and the solution of the dissolved composite material is centrifuged and heated to obtain the modified thermoplastic elastomer and the carbon nanotubes respectively.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a carbon nanotube modified thermoplastic elastomer composite material with solvent resistance and a preparation method thereof. Background technique [0002] Styrene-based thermoplastic elastomers (also known as styrene-based block copolymers Styreneic Block Copolymers, referred to as SBCs) are currently the world's largest thermoplastic elastomers with the properties most similar to rubber. [0003] SBS styrene-based thermoplastic elastomer is a variety with the largest output (accounting for more than 70%), the lowest cost and wide application among SBCs. It is a tri-block copolymer with styrene and butadiene as monomers. The characteristics of plastics and rubber, known as "third-generation synthetic rubber". Similar to styrene-butadiene rubber, SBS can be in contact with water, weak acid, alkali, etc. It has excellent tensile strength, large surface friction coeffi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/02C08K7/00C08K3/04C08F287/00
CPCC08K7/00C08F287/00C08K3/04C08K2201/011C08L53/02
Inventor 白静史子兴印杰
Owner SHANGHAI JIAO TONG UNIV
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