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Preparation method of topological elastomer with highly branched structure and low modulus and high elasticity

A highly branched and elastomeric technology, applied in the field of preparation of topological elastomers, can solve problems such as difficult to prepare, performance-limited rigid molecular chains, low modulus, etc., and achieve low equipment requirements, diverse polymerization methods, and simple operation Effect

Inactive Publication Date: 2020-08-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They synthesized thermoplastic elastomers based on block copolymers-hyperbranched styrene block copolymers. Although this type of material has high elasticity, the performance of this type of thermoplastic elastomer is limited by the rigid molecular chain of polystyrene , so it is difficult to prepare low modulus elastomers

Method used

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  • Preparation method of topological elastomer with highly branched structure and low modulus and high elasticity
  • Preparation method of topological elastomer with highly branched structure and low modulus and high elasticity
  • Preparation method of topological elastomer with highly branched structure and low modulus and high elasticity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1 (direct cross-linking method prepares topological elastomer)

[0054] The raw material of embodiment 1 and source are as shown in table 1:

[0055] Table 1 Embodiment 1 Raw materials and source

[0056]

[0057]

[0058] Preparation of topological elastomers:

[0059] Weigh the sample according to the ratio of PCL, pentaerythritol triacrylate and HDI at 1:0.5:1 (molar ratio), and dissolve it in an appropriate amount of butyl acetate. After stirring evenly, 0.5wt% of DBTDL and 1wt% of AIBN were added in sequence, and the mixture was poured into a mold, and reacted under heating at 70°C for 3h. After evacuating the solvent in a vacuum oven, the cross-linked topological elastomer can be obtained.

[0060] The mechanical properties of materials can be tested using a universal testing machine. The modulus, elongation at break and elastic recovery properties of the material can be calculated from the tensile curve. The obtained topological elastomer ha...

Embodiment 2

[0061] Embodiment 2 (post-crosslinking method, self-polymerization of dendritic branched macromolecules to form topological elastomers)

[0062] The raw material of embodiment 2 and source are as shown in table 2:

[0063] Table 2 Embodiment 2 raw materials and source

[0064]

[0065] Preparation of dendritic branched macromolecules whose end groups are methacrylate groups:

[0066] 1. Weigh the sample according to the ratio of triallylamine and allyl acrylate of 1:6 (molar ratio), stir evenly, add 5wt% triethylamine to catalyze and react for 1h;

[0067] 2. Then, add β-mercaptoethylamine of the same molar amount as allyl acrylate, 1wt% photoinitiator, and under 365nm ultraviolet light irradiation, under heating at 40°C, β-mercaptoethylamine dissolves while reacting;

[0068] 3. After the complete reaction of β-mercaptoethylamine, add allyl acrylate twice as much as that added in step 1, and then repeat step 1;

[0069] 4. Add 2 times the amount of β-mercaptoethylamine ...

Embodiment 3

[0076] Embodiment 3 (post-crosslinking method, two kinds of dendritic branched macromolecules are copolymerized into topological elastomers)

[0077] The raw material of embodiment 3 and source are as shown in table 3:

[0078] Table 3 Embodiment 3 raw materials and sources

[0079]

[0080]

[0081] Preparation of dendritic branched macromolecules whose terminal groups are amino groups:

[0082] 1. First, weigh the sample according to the ratio of triallylamine and allyl acrylate to 1:6 (molar ratio) and stir evenly, then add 5wt% triethylamine to catalyze and react for 1 hour;

[0083] 2. Then, add β-mercaptoethylamine of the same molar amount as allyl acrylate, 1wt% photoinitiator, and under 365nm ultraviolet light irradiation, under heating at 40°C, β-mercaptoethylamine dissolves while reacting;

[0084] 3. After the complete reaction of β-mercaptoethylamine, add allyl acrylate twice as much as that added in step 1, and then repeat step 1;

[0085] 4. Add 2 times ...

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Abstract

The invention discloses a preparation method of a topological elastomer with a highly branched structure and low modulus and high elasticity. The topological elastomer contains dendritic branched macromolecules, and the preparation method comprises the following steps: mixing a plurality of monomers by a direct cross-linking method, reacting, and simultaneously carrying out cross-linking reactionand highly branched structure forming reaction to directly obtain the topological elastomer; or a post-crosslinking method: firstly synthesizing dendritic branched macromolecules with a highly branched structure, and then crosslinking the dendritic branched macromolecules by using a crosslinking agent to obtain the topological elastomer; or a grafting method: grafting unreacted monomers or dendritic branched macromolecules into the polymer network to form the topological elastomer; or a copolymerizing method: copolymerizing unreacted monomers or dendritic branched macromolecules and a polymernetwork to form a network or double-network / interpenetrating network elastomer. The topological elastomer prepared by the preparation method can realize low modulus on the premise of keeping high elasticity.

Description

technical field [0001] The invention relates to the field of manufacture and application of topological elastomers with highly branched structures, in particular to a preparation method of topological elastomers with highly branched structures, low modulus and high elasticity. Background technique [0002] Elastomers with low modulus and high elasticity have important application prospects in biomedical materials, intelligent robots, aerospace and other fields. It is difficult to obtain materials with low modulus and high elasticity at the same time. Reducing the modulus of elastomers can be achieved by reducing the crosslinking density of the system and reducing the physical entanglement of the system, but when the crosslinking density and molecular chain entanglement are reduced When it reaches a certain level, the material is prone to creep and its elasticity decreases. Therefore, there is an inherent conflict between low modulus and high elasticity of polymeric material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G83/00C08G81/00C08G18/73C08G18/67C08G18/42C08J3/28C08G81/02C08G18/66C08G18/48C08G18/32
CPCC08G83/003C08G83/004C08G81/00C08G18/73C08G18/673C08G18/4277C08J3/28C08G81/024C08G18/6677C08G18/4854C08G18/3206C08J2300/202C08G18/42C08G83/006C08F283/006C08G18/8116C08G18/246C08G18/18C08F283/008C08F299/00C08F222/103C08F290/02C08F297/02C08G2270/00C08J3/24C08L101/025C08L101/08
Inventor 谢涛郑宁许小娜
Owner ZHEJIANG UNIV
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