Fundamental Study on Morphology Control of Polymer Alloys in an Electric Field.

电场中聚合物合金形态控制的基础研究。

基本信息

  • 批准号:
    63550667
  • 负责人:
  • 金额:
    $ 1.15万
  • 依托单位:
  • 依托单位国家:
    日本
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
  • 财政年份:
    1988
  • 资助国家:
    日本
  • 起止时间:
    1988 至 1989
  • 项目状态:
    已结题

项目摘要

A droplet suspended in a dielectric medium deforms into an ellipsoid under a relatively low electric field but bursts under a high electric field. This phenomenon suggests a possibility that morphology of polymer alloys especially that of polymer blends could be controlled with an electric field. In this study deformation of viscoelastic droplets in an electric field of was studied for droplets of aqueous solution of cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal) and those of aqueous poly(acrylamide) (PAA) suspended in media of poly(dimethyl siloxane) (PDMS). Under an AC field of calpha. 10^5 Vm^<-1>, the droplet deformed into an ellipsoid with a degree of deformation D defined by (X-Y)/(X+Y) where X and Y are the major and minor semiaxes of the ellipsoid, respectively. The D versus logarithm of time curve was double-step sigmoidal and was characterized with two retardation times. The deformation in the short time region was attributed to an elastic deformation due … More to a balance between the electric stress and the elasticity of the droplet. With increasing elapsed time, stress relaxation occurs in the droplet and hence the drop deforms further until it reaches an equilibrium deformation given by a balance between the electric stress and the interfacial tension. Theoretically, the magnitude of deformation D_F and the retardation time tau_F for the fast process are calculated theoretically as follows:D_FF = (9epsilon_oK_2E^2/16)(gamma/b + 5G/4)^<-1> (1) tau_F tau_F = eta_2/(G + b/gamma) (2) where epsilon_O is absolute dielectric constant of vacuum; K_2, the relative dielectric constant of the medium; E, the electric field; G, the quasi- -equilibrium shear modulus; gamma, the interfacial free energy; b, the radius b of the droplet; and eta_2, the viscosity of the medium. The observed D_F and tau_F agreed approximately with equations (1) and (2). The behavior of the slow process were also explained approximately by the theory of a viscous droplet reported previously. However, the equilibrium deformation was 1.4 times larger than the theoretical value. The time dependence of D was modeled by a mechanical model composed of parallel combination of a Maxwell element and a Voigt element. Less
悬浮在介质中的液滴在相对较低的电场下会变形为椭球体,但在较高电场下会发生爆炸。这一现象表明,聚合物合金的形态,特别是聚合物共混物的形态可以通过电场来控制。本文研究了十六烷基三甲基溴化铵(CTAB)和水杨酸钠水溶液以及悬浮在聚二甲基硅氧烷(PDMS)介质中的聚丙烯酰胺(PAA)水溶液在电场作用下粘弹性液滴的变形。在交流电磁场的作用下。10^5Vm;-1;gt;,液滴变形成椭球体,变形程度D由(X-Y)/(X+Y)定义,其中X和Y分别是椭球体的长半轴和次半轴。时间曲线的D-对数呈双阶梯S型曲线,表现为两次延迟。短时区域的变形归因于…引起的弹性变形更多的是在电应力和液滴弹性之间取得平衡。随着时间的延长,液滴中会发生应力松弛,因此液滴会进一步变形,直到达到由电应力和界面张力之间的平衡所给出的平衡变形。从理论上计算了快过程的变形量D_F和延迟时间T_u_F:D_ff=(9epsilon_OK_2e^2/16)(Gamma/b+5G/4)^&lt;-1&gt;(1)T_F T_f=Eta_2/(G+b/Gamma)(2)式中,epsilon_O是真空的绝对介电常数,K_2是介质的相对介电常数,E是电场,G是准平衡剪切模数,伽马是界面自由能;B是液滴的半径b,而eta_2是介质的粘度。观测到的D_F和T_F与方程式(1)和(2)基本一致。慢过程的行为也可以用以前报道的粘性液滴理论来近似解释。但平衡变形量是理论值的1.4倍。D的时间依赖性由Maxwell单元和Voigt单元的平行组合组成的力学模型来模拟。较少

项目成果

期刊论文数量(10)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
T.Tanaka: "Deformation of Viscoelastic Droplet in an Electric Field.1.Aqueous Cetyltrimethylammonium Bromide-Sodium Salysilate Solution in Poly(dimethylsiloxane)." Langmuir.
T.Tanaka:“电场中粘弹性液滴的变形。1.聚(二甲基硅氧烷)中的十六烷基三甲基溴化铵-水杨酸钠水溶液”。
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    0
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T. Tanaka, K. Adachi, and T. Kotaka: "Deformation of Viscoelastic Droplet in an Electric Field. 1. Aqueous Cetyltrimethylammonium Bromide - Sodium Salysilate Solution in Poly(dimethylsiloxane)." Langmuir.
T. Tanaka、K. Adachi 和 T. Kotaka:“电场中粘弹性液滴的变形。1. 十六烷基三甲基溴化铵水溶液 - 聚二甲基硅氧烷中的水杨酸钠溶液。”
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  • 影响因子:
    0
  • 作者:
  • 通讯作者:
Miyuki Tanaka: Langmuir.
田中美雪:朗缪尔。
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
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  • 通讯作者:
T.Tanaka: "Deformation Viscoelastic Droplet in an Electric Field.2.Aqueous Poly(acrylamide)Solution in Poly(dimethylsiloxane)"
T.Tanaka:“电场中的变形粘弹性液滴。2.聚(二甲基硅氧烷)中的聚(丙烯酰胺)水溶液”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
M.Tanaka: "Deformation of Viscoelastic Droplet in an Electric Field.1.Cetyltrimethylammonium Bromide Solution in Poly(dimethylsiloxane)" Langmuir.
M.Tanaka:“电场中粘弹性液滴的变形。1.聚(二甲基硅氧烷)中的十六烷基三甲基溴化铵溶液”Langmuir。
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    0
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ADACHI Keiichiro其他文献

ADACHI Keiichiro的其他文献

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{{ truncateString('ADACHI Keiichiro', 18)}}的其他基金

Effectiveness study of interventions to promote actual manmmograpy usage in a sample of Japanese middle-aged women.
在日本中年女性样本中促进实际使用乳房X光检查的干预措施的有效性研究。
  • 批准号:
    26380970
  • 财政年份:
    2014
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Development of intervention program to facilitate middle-aged women's use of mammography testing and its efficacy
促进中年女性使用乳腺X线检查的干预方案的制定及其效果
  • 批准号:
    23653216
  • 财政年份:
    2011
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Challenging Exploratory Research
Calorimetric Study of Order-Disorder Transition of Block Copolymers
嵌段共聚物有序-无序转变的量热研究
  • 批准号:
    07455385
  • 财政年份:
    1995
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Study of piezo-electric elastomer as tactile sensor of a robot
压电弹性体作为机器人触觉传感器的研究
  • 批准号:
    06555205
  • 财政年份:
    1994
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Relationship between Tranlational and Rotational Diffusions of Polymer Chains
聚合物链的平移和旋转扩散之间的关系
  • 批准号:
    04453106
  • 财政年份:
    1992
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (B)
Study of Dielectric Normal Mode Process in Semidilute and Concentrated Solutions of Polymers.
聚合物半稀溶液和浓溶液中介电简正模过程的研究。
  • 批准号:
    60550628
  • 财政年份:
    1985
  • 资助金额:
    $ 1.15万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

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在交变电场下通过微通道的液滴之间的传热
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