CN100590465C - Preparation method and application of controllable polarization thin film - Google Patents
Preparation method and application of controllable polarization thin film Download PDFInfo
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- CN100590465C CN100590465C CN200810124190A CN200810124190A CN100590465C CN 100590465 C CN100590465 C CN 100590465C CN 200810124190 A CN200810124190 A CN 200810124190A CN 200810124190 A CN200810124190 A CN 200810124190A CN 100590465 C CN100590465 C CN 100590465C
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Abstract
The invention relates to the preparation for a controllable polarized membrane and the application thereof, in particular to using a high molecular material for preparing an isotropic netty nano fibermembrane by the electrospinning technology; then the nano fiber membrane is compounded with a liquid crystal material and pulled along polarization direction needed, which causes nano fiber to be oriented along the pulling direction and guides the orientation of the pulling direction of liquid crystal, thereby obtaining the membrane with a controllable preparation direction. The membrane can be applied to the display and sensing fields. The preparation comprises the following steps: A. a disordered netty electrospinning nano fiber membrane is prepared at first; B. secondly, the liquid crystalmaterial is injected into and compounded with the netty electrospinning nano fiber membrane; C. the netty electrospinning nano fiber membrane compounded with the liquid crystal material is pulled along the direction needing orientation, and the nano fiber on the nano fiber membrane is led to be oriented along the pulling direction and the liquid crystal is induced to be arranged along the orientation of the nano fiber by the surface of the nano fiber membrane, thereby realizing the control of the polarization orientation of light.
Description
Technical field
The present invention relates to a kind of preparation method and application thereof of controllable polarization thin film, particularly macromolecular material is prepared isotropic mesh nano fiber membrane by electrospinning, then that this nano-fiber film and liquid crystal material is compound, and along the direction stretching nano-fiber film that needs polarization, make nanofiber be orientated along draw direction, thereby obtain the controlled film in polarization direction along draw direction orientation and guiding liquid crystal.This film can be applied to show and sensory field.
Background technology
Polarization film be because it can control the conduction of light wave effectively, thereby is widely used at present in polarizing filter, auto bulb anti-dazzle apparatus and various polarizing microscope or the detecting instrument before the liquid crystal display, shading sunglasses, anti-dazzle safety goggles, camera, video camera mirror.
For this reason, people have developed diversified polarization film such as polarization by reflection film, dichroic polarizing film, scatter-type polarization film, tinsel grating type polarization film, the not tension type polarization film of activity and E type polarization film etc.
Light scattering type polarization film showing great attention to and being extensive use of in numerous polarization films owing to cheap, simple in structure, people of being subjected to easy to prepare.The principle of light scattering polarization film is that anisotropic polymkeric substance is mixed with the material with birefringence index.An index-matched of anisotropic material and birefringence index material, and be unworthy of with another one.When the polymeric blends uniaxial tension, according to the polarization of incident light direction, scattering will take place or see through.Utilize the strong scattering or the total reflection principle of light can make colourless scatter-type polarization film, it is higher to the transmitance of visible light wave range light, is specially adapted to the polarizing instrument that ask for something truly reflects natural light.
In the many decades in the past, people have developed diversified light scattering type polarization film, mainly are based on drawing process, and it is the dispersed liquid crystal thin polymer film that its typical case is represented as PDLC.When the PDLC film stretching, the liquid crystal droplet that disperses in the flexible polymer is stretched and the molecule of birefringence index is parallel with the drop surface, thereby produces or detect polarized light.But above-mentioned stretching is arranged and is existed some problems to be still waiting to solve.Except the film transfer process of complexity, stretching to arrange depends on polymkeric substance usually at the intersegmental stretch capability of the chain that tangles.This needs viscoelasticity film and suitable draw speed, will cause physical disturbance otherwise stretch.On the other hand, limited extensibility is tended to drop is become ellipse, and whole grappling liquid crystal molecules on draw direction.These shortcomings greatly reduce the efficient of polarization film, therefore are necessary the light scattering type polarization film that development efficiency is higher.
In fact, the polarization film device that just has some function admirables at nature.For example, the compound eye of some spiders is responsive to the polarized light response, and its reason just is the orientations of the nano rod about 100 nanometers on its retina.Inspired by this, people will be orientated electro spinning nano fiber film and the compound light scattering type polarization film of successfully having prepared function admirable of liquid crystal.Its optical property has surpassed present known various light scattering type polarization films.The nanofiber that its keys to success just are to be orientated in the higher and nano-fiber film of the orientation of electro spinning nano fiber film has bigger specific surface area, therefore can cause more liquid crystal molecular orientation to be arranged by its surface.
Certainly, also there are some problems of its use aspect in the light scattering type polarization film that is composited of orientating type electro spinning nano fiber film and liquid crystal material.For example, in actual use, polarization film often needs to adjust its polarization direction.For the light scattering type polarization film that orientating type electro spinning nano fiber film and liquid crystal are composited, then have only whole film rotation could be realized this function.Traditional PDLC then only needs to stretch and can realize along the polarization direction.And be not suitable for the light scattering type polarization film that orientating type electro spinning nano fiber film and liquid crystal are composited equally by senser element that stretch to realize polarization, because its orientation is fixing and in case change is difficult for recovery.
Summary of the invention
Technical matters: the purpose of this invention is to provide controlled nanofiber of a kind of polarization orientation and liquid crystal compound light scattering type polarization film preparation method and application thereof, this method can make things convenient for the control that realizes at an easy rate light, the controlled film preparation of this polarization orientation is simple, with low cost, easy to operate, can be used as new display device, senser element or light regulation and control device.
Technical scheme: for this reason, the present invention induces the nanofiber of the big specific surface area of liquid crystal arrangement to combine with in the stretching among the PDLC and the nano-fiber film, compound with netted electro spinning nano fiber film and liquid crystal, can have the controlled novel light scattering type polarization film of polarization orientation with preparation.
Controllable polarization thin film of the present invention is characterized in that being prepared as follows:
A, at first obtain unordered netted electro spinning nano fiber film by electrospinning;
Secondly B, liquid crystal material is injected netted electro spinning nano fiber film and compound with it;
C, will stretch along the direction of needs orientation with the compound mesh nano fiber membrane of liquid crystal material makes nanofiber on the mesh nano fiber membrane along the draw direction orientation and and then arrange along the nanofiber direction of orientation by its spatial induction liquid crystal material and to realize control that polarisation of light is orientated.
Described electro spinning nano fiber film and liquid crystal material are immiscible.
The ordinary light refractive index of described liquid crystal material and the refractive index difference of electro spinning nano fiber material are less than 5%.
But described polarization orientation controlled thin film is applied to demonstration, sensing and spectrum control field.
Beneficial effect: polarization film can be controlled the conduction of light wave effectively owing to it, thereby has a wide range of applications in fields such as comprising demonstration, detection at present.Light scattering type polarization film showing great attention to wherein owing to cheap, simple in structure, people of being subjected to easy to prepare.
It is the dispersed liquid crystal thin polymer film that the typical case of light scattering type polarization film is represented as PDLC.When the PDLC film stretching, the liquid crystal droplet that disperses in the flexible polymer is stretched and the molecule of birefringence index is parallel with the drop surface, thereby produces or detect polarized light.But above-mentioned stretching is arranged and is existed some problems to be still waiting to solve.Except the film transfer process of complexity, stretching to arrange depends on polymkeric substance usually at the intersegmental stretch capability of the chain that tangles.This needs viscoelasticity film and suitable draw speed, will cause physical disturbance otherwise stretch.On the other hand, limited extensibility is tended to drop is become ellipse, and whole grappling liquid crystal molecules on draw direction.These shortcomings greatly reduce the efficient of polarization film, therefore are necessary the light scattering type polarization film that development efficiency is higher.
For this reason, people will be orientated electro spinning nano fiber film and the compound light scattering type polarization film of successfully having prepared function admirable of liquid crystal.Its optical property has surpassed present known various light scattering type polarization films.The nanofiber that its keys to success just are to be orientated in the higher and nano-fiber film of the orientation of electro spinning nano fiber film has bigger specific surface area, therefore can cause more liquid crystal molecular orientation to be arranged by its surface.
But also there are some problems of its use aspect in the light scattering type polarization film that orientating type electro spinning nano fiber film and liquid crystal material are composited.For example, in actual use, polarization film often needs to adjust its polarization direction.For the light scattering type polarization film that orientating type electro spinning nano fiber film and liquid crystal are composited, then have only whole film rotation could be realized this function.Traditional PDLC then only needs to stretch and can realize along the polarization direction.And be not suitable for the light scattering type polarization film that orientating type electro spinning nano fiber film and liquid crystal are composited equally by senser element that stretch to realize polarization, because its orientation is fixing and in case change is difficult for recovery.
For this reason, the present invention induces the nanofiber of the big specific surface area of liquid crystal arrangement to combine with in the stretching among the PDLC and the nano-fiber film, compound with netted electro spinning nano fiber film and liquid crystal, can have the controlled novel light scattering type polarization film of polarization orientation with preparation.
The controlled film preparation of this polarization orientation is simple, and is with low cost, easy to operate, might be as new display device, senser element or light regulation and control device.
Embodiment
The present invention is further illustrated below in conjunction with embodiment.
Embodiment 1:
The preparation of A, unordered netted electro spinning nano fiber film:
With mean molecular weight is 100000, and concentration is sprayed by 10,000 volts the driven that the high pressure positive supply provides with 1 milliliter/hour speed by syringe for 20% poly-n-butyl methacrylate and the acetone soln of polymethyl methacrylate copolymer.Electrode is 15 centimetres far is fixed on 10 cm x, 10 centimeter square on the copper coin that spacing is 3 millimeters pin (diameter is 0.5 a millimeter) array.After the electrospinning 2 hours, take off the electro spinning nano fiber film of collecting on the pin array standby.
The preparation of B, light scattering type polarization film:
After above-mentioned netted electro spinning nano fiber film cut into 2 centimetres of 2 cm x, fix its four limit respectively by four clips, and be placed on the glass sheet.Inject liquid crystal material PN-001 toward film.The light cover glass of pressing on it.
The polarisation of light control of C, light scattering type polarization film
C1, above-mentioned light scattering type polarization film is pulled outward and oriented film by a clip, can obtain the polarized light of draw direction.After resetting, clip can remove polarization effect.
C2, above-mentioned light scattering type polarization film is pulled outward and oriented film by the adjacent clip of above-mentioned C1 clip, can obtain and the vertical polarized light in above-mentioned C1 polarization direction.
Embodiment 2:
The preparation of A, unordered netted electro spinning nano fiber film:
With mean molecular weight is 100000, and concentration is sprayed by 10,000 volts the driven that the high pressure positive supply provides with 1 milliliter/hour speed by syringe for 20% poly-n-butyl methacrylate toluene solution.To electrode is 15 centimetres far away 10 cm x 10 centimeter square, and the aperture is 1 millimeter a copper mesh.After the electrospinning 2 hours, take off the electro spinning nano fiber film of collecting on the copper mesh standby.
The preparation of B, light scattering type polarization film:
After above-mentioned netted electro spinning nano fiber film cut into 2 centimetres of 2 cm x, it was respectively placed one up and down and fixes its four limit respectively by four clips, and is placed on the glass sheet.Inject liquid crystal material SLC-9023 toward film.The light cover glass of pressing on it.
The polarisation of light control of C, light scattering type polarization film
C1, above-mentioned light scattering type polarization film is pulled outward and oriented film by a clip, can obtain the polarized light of draw direction.After resetting, clip can remove polarization effect.
C2, above-mentioned light scattering type polarization film is pulled outward and oriented film by the adjacent clip of above-mentioned C1 clip, can obtain and the vertical polarized light in above-mentioned C1 polarization direction.
Claims (3)
1, a kind of preparation method of controllable polarization thin film is characterized in that being prepared as follows:
A, at first obtain unordered netted electro spinning nano fiber film by electrospinning;
Secondly B, will inject netted electro spinning nano fiber film with the immiscible liquid crystal material of electro spinning nano fiber film and compound with it;
C, will stretch along the direction of needs orientation with the compound mesh nano fiber membrane of liquid crystal material makes nanofiber on the mesh nano fiber membrane along the draw direction orientation and and then arrange along the nanofiber direction of orientation by its spatial induction liquid crystal material and to realize control that polarisation of light is orientated.
2, the preparation method of controllable polarization thin film as claimed in claim 1, the refractive index difference that it is characterized in that the ordinary light refractive index of described liquid crystal material and electro spinning nano fiber material is less than 5%.
3. the application of a controllable polarization thin film, but it is characterized in that described polarization orientation controlled thin film is applied to demonstration, sensing and spectrum control field by the direction controllable polarization thin film of preparation method's preparation of claim 1 or 2 described controllable polarization thin films.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810124190A CN100590465C (en) | 2008-06-17 | 2008-06-17 | Preparation method and application of controllable polarization thin film |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810124190A CN100590465C (en) | 2008-06-17 | 2008-06-17 | Preparation method and application of controllable polarization thin film |
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| Publication Number | Publication Date |
|---|---|
| CN101303427A CN101303427A (en) | 2008-11-12 |
| CN100590465C true CN100590465C (en) | 2010-02-17 |
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| CN200810124190A Expired - Fee Related CN100590465C (en) | 2008-06-17 | 2008-06-17 | Preparation method and application of controllable polarization thin film |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010043200A1 (en) * | 2010-02-10 | 2011-08-11 | Johnson Controls Automotive Electronics GmbH, 75196 | Display element for a display unit in a vehicle |
| CN107167862A (en) * | 2017-07-06 | 2017-09-15 | 京东方科技集团股份有限公司 | The preparation method of polaroid, display device and polaroid |
| CN113235227B (en) * | 2021-04-19 | 2024-04-16 | 华南理工大学 | Preparation method and application of composite film |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5088807A (en) * | 1988-05-23 | 1992-02-18 | Imperial Chemical Industries Plc | Liquid crystal devices |
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- 2008-06-17 CN CN200810124190A patent/CN100590465C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5088807A (en) * | 1988-05-23 | 1992-02-18 | Imperial Chemical Industries Plc | Liquid crystal devices |
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