Dielectric Study on the Dynamic Heterogeneity of Binary Polymer Blends using Pressure as the Controlled Variable

以压力为控制变量的二元聚合物共混物动态非均质性介电研究

• 批准号: 16550175
• 负责人: URAKAWA Osamu
• 金额: $ 2.3万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16550175/
• 关键词: Pressure; Dielectric Relaxation; Polymer Blend; Dynamic_Heterogeneity; 高圧; 動的不均一; 高分子ブレンド

Recently it has been appreciated that, in several miscible binary polymer blends, the molecular motions of component polymers are heterogeneous, e.g. temperature dependences of each component dynamics are different. We think that the application of a pressure can reduce the distances between polymer segments and thus may induce more cooperative segmental motion between different polymer species. This will result in the increase of the dynamical homogeneity. Based on this view, we aim to clarify the degree of dynamic heterogeneity(homogeneity) as a function of pressure in this research project.Firstly, we constructed the dielectric cell in which the pressure can be controlled from 0.1MPa to 400MPa. Secondly, we tested the performance of the pressure cell. As a test sample we used a single component amorphous polymer, poly(buthylene oxide), which has the dipole moment parallel to the chain contour and thus global chain relaxation (so called normal mode process) is dielectrically observable. From this measurement we determined both the normal mode relaxation times τ_n and the segmental relaxation times τ_s. We found that both relaxation times have the same pressure dependence, i.e. log τ=log τ_0+b(P-P_0), where τ_0 is the relaxation time at atmospheric pressure, P_0 and b is the constant. This type of pressure dependence is already reported by several researchers. Therefore, we concluded that the applied pressure uniformly transmits to the sample specimen and dielectric measurements under the pressure can be done without problems.We studied dynamically heterogeneous behavior for several miscible blend systems under atmospheric pressure. However the systematic data for the pressure dependences of them have not yet been obtained. In the next step we are going to do dielectric measurement on several blend systems under the pressure and want to clarify the quantitative relationship between the pressure and the degree of dynamic heterogeneity.

近年来人们认识到，在几种可混相二元聚合物共混体系中，各组分聚合物的分子运动是不均匀的，例如，各组分动力学的温度依赖性是不同的。我们认为施加压力可以减少聚合物段之间的距离，从而可以诱导不同聚合物种之间的更合作的节段运动。这将导致动力均匀性的增加。基于这一观点，我们的目标是在本研究项目中阐明动态异质性（同质性）作为压力函数的程度。首先，我们构建了压力可控制在0.1MPa ~ 400MPa的介质电池。其次，我们测试了压力电池的性能。作为测试样品，我们使用了一种单组分无定形聚合物，聚（亚甲基氧化物），它的偶极矩平行于链的轮廓，因此全局链弛豫（所谓的正模过程）是电介质可观察到的。从这个测量我们确定了正模弛豫时间τ_n和段弛豫时间τ_s。我们发现两个弛豫时间具有相同的压力依赖性，即log τ=log τ_0+b(P-P_0)，其中τ_0是大气压下的弛豫时间，P_0和b是常数。这种类型的压力依赖已经被一些研究人员报道过。因此，我们得出的结论是，施加的压力均匀地传递到样品中，并且在压力下进行介电测量是没有问题的。对几种混相共混体系在常压下的非均相行为进行了动态研究。然而，关于它们的压力依赖性的系统数据尚未获得。在下一步中，我们将在压力下对几种共混体系进行介电测量，并希望阐明压力与动态非均质程度之间的定量关系。

项目成果

Effect of Intermolecular Interactions on the Dynamic Heterogeneity in Miscible Polymer Blends In "Structure and Dynamics in Macromolecular Systems with Specific Interactions"(Edited by K.Adachi, T.Sato)

“具有特定相互作用的大分子系统的结构和动力学”中分子间相互作用对可混溶聚合物共混物动态异质性的影响（由 K.Adachi、T.Sato 编辑）

• 发表时间: 2005
• 作者: T. Yasuda;T. Imase;S. Sasaki;T. Yamamoto;Synthesis;Solid Structure;and Optical Properties of New-Thiophene-Based;浦川 理
• 通讯作者: 浦川 理

Subchain Dynamics in Disordered Diblock Copolymer : Poly(isoprene-blcok-butadiene)

无序二嵌段共聚物中的子链动力学：聚（异戊二烯-嵌段-丁二烯）

• 发表时间: 2004
• 期刊: Nihon Reoroji Gakkaishi 32,4
• 作者: C.K.Loong;M.OZAWA;T.Takeuchi;K.Ui;N;Koura;氏家誠司;Osamu Urakawa
• 通讯作者: Osamu Urakawa

Self-Diffusion and Viscosity of Low Molecular Weight Polystyrene over a Wide Temperature Range

低分子量聚苯乙烯在宽温度范围内的自扩散和粘度

• 发表时间: 2004
• 期刊: Macromolecules 37・4
• 作者: 今中信人;小澤正邦ほか共著;Kazutoshi Ono;Tadao Oikawa;Osamu Urakawa;坂口 剛;Tsuyoshi Sakaguchi;浦川 理;浦川 理
• 通讯作者: 浦川 理

Dielectric Study of Dynamical Heterogeneity in Eco-friendly Polymer Blends : Poly(lactic acid)/Polyether

环保聚合物共混物动态非均质性的介电研究：聚乳酸/聚醚

• 发表时间: 2004
• 期刊: Nihon Reoroji Gakkaishi 32,4
• 作者: 今中信人;小澤正邦ほか共著;Kazutoshi Ono;Tadao Oikawa;Osamu Urakawa;坂口 剛;Tsuyoshi Sakaguchi;浦川 理;浦川 理;Jindong Ren
• 通讯作者: Jindong Ren

Dynamics in Disordered Block Copolymers and Miscible Blends Composed of Poly(vinylethylene) and Polyisoprene

由聚乙烯乙烯和聚异戊二烯组成的无序嵌段共聚物和可混溶共混物的动力学

• 发表时间: 2004
• 期刊: Journal of Polymer Science : Part B : Polymer Physics 42,2
• 作者: 今中信人;小澤正邦ほか共著;Kazutoshi Ono;Tadao Oikawa;Osamu Urakawa;坂口 剛;Tsuyoshi Sakaguchi;浦川 理;浦川 理;Jindong Ren;Osamu Urakawa;Osamu Urakawa;Yuji Hirose
• 通讯作者: Yuji Hirose