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Shape memory material based on olefin block copolymers

An olefin block and copolymer technology, applied in the field of shape memory materials, can solve problems such as constraints, reversible phase transition temperature limitations, and few types of thermoplastic elastomers

Inactive Publication Date: 2013-07-31
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since there are few types of thermoplastic elastomers with shape memory ability, the transition temperature of the reversible phase is also relatively limited, which is greatly restricted in practical applications.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] OBC (LOT NO OBC-2) and paraffin (melting point at 30 o C or so) is completely dissolved in xylene, wherein the ratio of OBCs to paraffin is 50 parts and 50 parts. The material obtained after evaporating the solvent to dryness is molded into a sheet, cut into a rectangular sample with a width of 4 mm and a length of 20 mm for testing. The shape fixation and shape recovery rate of the obtained material are relatively ideal.

Embodiment 2

[0018] OBC (LOT NO OBC-3) placed in hexadecane (melting point at 10 o C or so) liquid, at 80 o Place it under C for 24h to make the paraffin spread as evenly as possible, wherein the ratio of OBCs to hexadecane is 70 parts and 30 parts, and the shape memory test is carried out in tensile mode, and the material is tested at 60 o Stretch to 100% at C, fix the shape in ice water, and then heat up to 60 o C, record the response, the shape fixation rate and recovery rate are close to 100%.

Embodiment 3

[0020] Others are the same as in Example 2, the ratio of OBCs to hexadecane is 30 parts and 70 parts, and the shape fixation rate and recovery rate of the obtained material are both close to 100%.

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Abstract

The invention belongs to the technical field of memory materials, and specifically relates to a shape memory material based on olefin block copolymers (OBCs). The material is composed of at least the following two components of OBCs and small molecular crystalline substances, and also may comprise other components. The material is characterized in that a permanent shape is determined by the OBCs and shape change is controlled by the small molecular crystalline substances. Polymer matrixes may the OBCs in various structures and compositions, and the small molecular crystalline substances may be small molecules having good compatibility with the OBCs and melting points lower than those of the OBCs. The method has the advantages that the OBCs are selected as the matrixes; the obtained modified materials have excellent mechanical properties and very large breaking elongation; the optional small molecular crystalline substances have various species; a transition temperature of the material can be controlled precisely by changing the species of the optional small molecular crystalline substances; and since the OBCs are produced in large scale and processing and shaping method for the OBCs are very mature, the shape memory composite material has possibility for large-scale production. The shape memory composite material has huge potential application values in intelligent textiles and thin film materials.

Description

technical field [0001] The invention belongs to the technical field of shape-memory materials, in particular to a shape-memory composite material of olefin block copolymers (OBCs) and paraffin, which is at least composed of the following two components: OBCs, small molecular crystalline substances, and may also contain other components. The modified material is characterized in that the permanent shape is determined by OBCs, and the shape change is controlled by small molecular crystalline substances. Background technique [0002] Shape memory material is a very important smart material, which has the ability to sense some changes in the external environment. This responsive material is widely used in the field of smart materials and structures. For shaped memory materials, under certain environmental conditions (such as heating, light or electromagnetic field induction, etc.), the physical parameters of the shape memory materials (such as shape, volume or strain, etc.) wil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L53/00C08K5/01C08K5/17C08K5/09
Inventor 冯嘉春张卿隆
Owner FUDAN UNIV
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