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Polymer piezoelectric material, laminate, method for producing piezoelectric polymer material, and method for producing laminate

A piezoelectric material and polymer technology, applied in the manufacture/assembly of piezoelectric/electrostrictive devices, piezoelectric/electrostrictive devices, piezoelectric/electrostrictive/magnetostrictive devices, etc., can solve Inhomogeneous electrical properties of laminated structures

Active Publication Date: 2018-11-27
MITSUI CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the inventors of the present application have found the following problem: Even if the cutting conditions are adjusted so that no cracks are generated during cutting, the polymer piezoelectric material made of polylactic acid or the like is easy to be cut and processed. Cracks are generated after heating in the process or product. Due to the occurrence of cracks, especially when the polymer piezoelectric material and other materials are made into a laminated structure, there is a gap between the polymer piezoelectric material and other materials. Voids are generated, and the electrical properties of the laminated structure tend to become uneven

Method used

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  • Polymer piezoelectric material, laminate, method for producing piezoelectric polymer material, and method for producing laminate
  • Polymer piezoelectric material, laminate, method for producing piezoelectric polymer material, and method for producing laminate
  • Polymer piezoelectric material, laminate, method for producing piezoelectric polymer material, and method for producing laminate

Examples

Experimental program
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preparation example Construction

[0163] -Sample preparation-

[0164] The helical chiral polymer (A) was dissolved in a solvent (for example, chloroform) at 40° C. to prepare a sample solution with a concentration of 1 mg / mL.

[0165] -Measurement conditions-

[0166] At a temperature of 40° C., 0.1 mL of the sample solution was introduced into the column using a solvent [chloroform] at a flow rate of 1 mL / min.

[0167] The concentration of the sample in the sample solution separated by the column was measured using a differential refractometer. A universal calibration curve was prepared using polystyrene standard samples, and the weight average molecular weight (Mw) and molecular weight distribution (Mw / Mn) of the helical chiral polymer (A) were calculated.

[0168] As the polylactic acid-based polymer as an example of the helical chiral polymer (A), commercially available polylactic acid can be used.

[0169] Examples of commercially available products include PURASORB (PD, PL) manufactured by PURAC, LAC...

Embodiment 1

[0212] [Production of piezoelectric polymer materials and laminates]

[0213]

[0214] Polylactic acid (PLA) (trade name: Ingeo TM biopolymer, brand name: 4032D, weight-average molecular weight Mw: 200,000) into the feed hopper of the extrusion molding machine, while heating at 220°C to 230°C, extrude from a T-die with a width of 2000mm to make it with 50 A cast roll (cast roll) at °C was contacted for 0.5 minutes to form a pre-crystallized film with a thickness of 150 μm (molding step). The crystallinity of the obtained precrystallized film was measured and found to be 4.91%.

[0215] For the obtained precrystallized film, while heating at 70° C., stretching was started in a roll-to-roll manner at a stretching speed of 1650 mm / min, and uniaxially stretched in the MD direction to 3.5 times to obtain a uniaxially stretched film (stretching step).

[0216] Then, the uniaxially stretched film was annealed by contacting the roll heated to 130° C. for 78 seconds in a roll-to-r...

Embodiment 2

[0295] In Example 2, the piezoelectric polymer material and the laminate were produced under the same conditions as in Example 1 except that the scanning speed as the laser irradiation condition was changed to 30 m / min (500 mm / sec).

[0296] Table 1 shows the measurement results in Example 2.

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Abstract

The present invention relates to a polymer piezoelectric material, which comprises at least 2 regions, and the at least 2 regions include: a region H as an alignment polymer piezoelectric region, and the region H includes a region with a weight average molecular weight of 50,000 to 50,000 1 million optically active helical chiral polymers (A), and the crystallinity obtained by DSC method satisfies 20% to 80%, and when the standard thickness measured by microwave transmission type molecular orientation meter is set to 50 μm The standardized molecular orientation of satisfies 3.5 to 15.0; and the region L as a low orientation region, the region L includes an optically active helical chiral polymer (A) with a weight average molecular weight of 50,000 to 1 million, and exists in all At least a part near the end of the region H, and the average width when viewed from the normal direction to the main surface of the region H is 10 μm to 300 μm, and the retardation satisfies 100 nm or less.

Description

technical field [0001] The present invention relates to a piezoelectric polymer material, a laminate, a method for producing a piezoelectric polymer material, and a method for producing a laminate. Background technique [0002] As piezoelectric materials, PZT (PbZrO 3 -PbTiO 3 solid solution), but since PZT contains lead, more and more flexible polymer piezoelectric materials with low environmental impact are being used. [0003] As the polymer piezoelectric material, nylon 11, polyvinyl fluoride, polyvinyl chloride, polyurea, polyvinylidene fluoride (β type) (PVDF), vinylidene fluoride-trifluoroethylene copolymer (P(VDF-TrFE) )(75 / 25) and the like are known. [0004] In recent years, in addition to the above, techniques have been reported that use optically active helical chiral polymers (for example, polylactic acid-based polymers typified by polylactic acid) as polymeric piezoelectric materials. [0005] For example, a polymer piezoelectric material is disclosed that ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L41/193B32B7/02B32B27/36C08L67/04C08L101/16H01L41/053H01L41/083H01L41/09H01L41/253H01L41/45
CPCH10N30/04H10N30/085H10N30/857H10N30/098C08L67/04C08L101/12H10N30/88H10N30/50B32B27/36B32B7/12B32B27/08B32B2250/244B32B2255/10B32B2307/20B32B2457/00C08G63/06C08J5/18C08J7/123C08J2367/04
Inventor 谷本一洋吉田光伸西川茂雄
Owner MITSUI CHEM INC
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