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Method for thermally reversibly crosslinking styrenic thermoplastic elastomer material

A thermoplastic elastomer and styrene-based technology, applied in the field of chemical material preparation, can solve problems such as low strength and easy aging, and achieve the effects of low cost, improved mechanical properties, and simple methods

Inactive Publication Date: 2015-05-20
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 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

Method used

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  • Method for thermally reversibly crosslinking styrenic thermoplastic elastomer material
  • Method for thermally reversibly crosslinking styrenic thermoplastic elastomer material
  • Method for thermally reversibly crosslinking styrenic thermoplastic elastomer material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve SBS and furfuryl mercaptan in toluene in different proportions, add an appropriate amount of photoinitiator I907, and the grafting ratio of furfuryl mercaptan can be selected as 2%, 5%, 10%, 15%, 20%, after stirring evenly , performing a click reaction under UV light. Then add N,N'-(4,4'-methylenediphenyl)bismaleimide with half the mole number of furan to the reacted solution (furan and maleimide structure The molar ratio is 1:1), after stirring evenly, heat cross-linking molding at 80°C. Table 1 shows the elongation at break and strength at break in tensile tests of various ratio materials. figure 1 It is the nuclear magnetic and infrared images of the SBS after furan grafting 20% ​​in embodiment 1. figure 2 It is the stress-strain graph of the material of various proportions in embodiment 1.

[0022] Table 1

[0023]

Embodiment 2

[0025] SBS and furfuryl mercaptan were dissolved in xylene, an appropriate amount of photoinitiator I907 was added, and the ratio was set to 15% of furfuryl mercaptan grafting. After stirring evenly, the click reaction was carried out under ultraviolet light. Then add different amounts of N,N'-(4,4'-methylenediphenyl)bismaleimide to the reacted solution, wherein the mole of maleimide accounts for the mole of furan The ratio is 0%, 20%, 40%, 60%, 80% and 100%. After stirring evenly, it is heated at 80°C for cross-linking. Table 2 shows the elongation at break and strength at break in tensile tests of various ratio materials. image 3 It is the stress-strain graph of the material of various proportions in embodiment 2.

[0026] Table 2

[0027] Mole ratio of maleimide to furan Elongation at break (%) Breaking strength (MPa) 0 1127.56 7.14 20％ 914.54 10.07 40％ 922.54 12.02 60％ 933.89 11.54 80％ 843.21 14.96 100％ 751.99 9.45 ...

Embodiment 3

[0029] In Example 2, the grafting amount of furan is 15%, and the sample whose molar ratio of maleimide to furan is 80% is cut into pieces after film formation, and the film is re-formed at 150°C under the condition of 10MPa, and the process is repeated three times , to test the tensile strength of each obtained film, and Table 3 shows the elongation at break and the strength at break in the tensile test of each re-produced material. Figure 4 is the stress-strain graph of the reshaped material in Example 3.

[0030] table 3

[0031] Elongation at break (%) Breaking strength (MPa) as it is 843.21 14.96 first remodeling 875.19 14.10 second remodeling 892.66 12.71

[0032] third remodeling 885.71 12.03

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Abstract

The invention discloses a method for thermally reversibly crosslinking a styrenic thermoplastic elastomer material. The method for thermally reversibly crosslinking the styrenic thermoplastic elastomer material comprises the following steps: firstly under the condition of ultraviolet light illumination, grafting sulfhydryl furan to a soft segment section of the styrenic thermoplastic elastomer SBC (TPE-S) by utilizing sulfhydryl-alkene click reaction, then adding a maleimide compound containing at least two maleimide groups, and carrying out reversible chemical crosslinking based on Diels-Alder reaction under the heating condition, so that the aim of reversibly crosslinking and modifying polystyrene-butadiene-styrene is achieved. The styrenic thermoplastic elastomer modifying method disclosed by the invention is simple, raw materials are available, and cost is low; and the styrenic thermoplastic elastomer modified by utilizing the method disclosed by the invention is improved in mechanical properties and solvent resistance and still has thermoplasticity.

Description

technical field [0001] The invention belongs to the technical field of chemical material preparation, and in particular relates to a method for ultraviolet light modification of a styrene thermoplastic elastomer SBC (TPE-S) and a reversibly crosslinked modified thermoplastic elastomer system. Background technique [0002] 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) hav...

Claims

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Application Information

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IPC IPC(8): C08C19/20C08C19/22
Inventor 白静史子兴印杰苏志龙李晖
Owner SHANGHAI JIAO TONG UNIV
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