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The effects of molecular entanglement on rheological properties of quasi 2D polymers

分子缠结对准二维聚合物流变性能的影响

基本信息

批准号：
13640405
负责人：
MAEDA Toshiteru
金额：
$ 2.18万
依托单位：
Ishinomaki Senshu University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2003
项目状态：
已结题

项目摘要

New method and equipment have been developed for dynamic light scattering spectroscopy to investigate molecular interactions of polymer molecules confined to quasi 2D environment. We mainly focused on an estimation of the performance of our newly developed system and the preliminary measurements for colloidal dispersions and 2D and 3D polymer solutions.1. We developed a dynamic light scattering spectrometer which incorporated a photon counting system and a multiscaler which enabled us to get the time-resolved photon-counting rate. Time series of counted rate was transferred to an personal computer and was analyzed with software-based frequency analyzer. Maximum time resolution was 5 ns. We also introduced a heterodyne mixing method for extracting subtle fluctuation from scattered light.We can easily analyze the heterodyne spectra obtained by our system since any artificial assumptions on the statistical properties of fructuation is not required. This is inevitable for investigating quasi-2D polymer systems which is expected to show anomalous diffusion processes.2. Colloidal dispersions and microemulsions were employed as model systems for observing dynamics of interfacial phenomena in soft matter. It was possible to separate the Brownian dynamics and flow dynamics in a colloidal solution by measuring a heterodyne spectrum of scattering light.3. The light scattering measurement for the polymer films spread on a water-air interface was extremely weak for our system. It was not possible to get sufficient quality of signal. This was caused by poor efficiency at fiber-fiber coupling. We will continue to improve the total throughput of the system.4. In summary, we have developed a versatile dynamic light scattering system which is suitable for investigating complex fluid which shows non-gaussian dynamics.

发展了一种新的动态光散射方法和装置，用于研究聚合物分子在准二维环境中的相互作用。我们主要关注我们新开发的系统的性能估计以及胶体分散体和2D和3D聚合物溶液的初步测量。1.我们研制了一种动态光散射光谱仪，它结合了光子计数系统和多定标器，使我们能够得到时间分辨的光子计数率。将计数率的时间序列传输到个人计算机，并使用基于软件的频率分析仪进行分析。最大时间分辨率为5 ns。我们还介绍了一种从散射光中提取微小涨落的外差混频方法，由于不需要对涨落的统计特性作任何人为的假设，所以我们可以很容易地分析由我们的系统得到的外差光谱。这对于研究具有反常扩散过程的准二维聚合物体系是不可避免的.以胶体分散体和微乳液为模型体系，研究了软物质中界面现象的动力学。通过测量散射光的外差光谱，可以分离胶体溶液中的布朗动力学和流动动力学.对于我们的系统，水-空气界面上的聚合物膜的光散射测量是非常弱的。无法获得足够的信号质量。这是由于光纤-光纤耦合效率差造成的。我们将继续提高系统的总吞吐量。综上所述，我们开发了一个多功能的动态光散射系统，它适用于研究复杂的流体，显示非高斯动力学。