SANS and SAXS Investigation of the Melt State Structure in Disentangled Ultrahigh Molecular Weight Polyethylene

IF 5.2 Q1 POLYMER SCIENCE ACS Macro Letters Pub Date : 2025-03-05 DOI:10.1021/acsmacrolett.5c00100

Aakash Sharma, Margarita Kruteva, Lutz Willner, Dario Romano, Lionel Porcar, Martin Dulle, Fuhai Zhou, Sanjay Rastogi, Dieter Richter

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Abstract

Disentangled ultrahigh molecular weight polyethylene exhibits a time-dependent increase in rheology modulus when molten. This originates from its kinetically evolving heterogeneous microstructure consisting of disentangled and entangled regions. We report a quantitative analysis of this microstructure using X-rays and neutrons that capture the signatures of these regions. We analyze the absolute intensities to obtain the volume fraction and size distribution of the disentangled domains in the melt. Employing neutrons, we follow the changes in these parameters with time. The trends are qualitatively similar to those of the previous rheological observations. Our methodology also provides an experimental verification of the theoretical report by McLeish, T. C. B. Soft Matter 2007, 3 (1), 83–87, which predicts the presence of high density disentangled domains in a low density entangled matrix. The analysis presented here is a useful instrument for unveiling the origin of differences in the properties of polymers obtained through different processing routes.

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解缠超高分子量聚乙烯熔体态结构的SANS和SAXS研究

解缠超高分子量聚乙烯在熔融时表现出随时间的流变模量增加。这源于其动力学演化的非均匀微观结构，由非纠缠区和纠缠区组成。我们报告了使用x射线和中子捕获这些区域的特征对这种微观结构的定量分析。通过对绝对强度的分析，得到了熔体中解缠畴的体积分数和尺寸分布。利用中子，我们跟踪这些参数随时间的变化。这些趋势在性质上与以前的流变观察结果相似。我们的方法也为McLeish， t.c.b. Soft Matter 2007, 3(1)， 83-87的理论报告提供了实验验证，该报告预测在低密度纠缠矩阵中存在高密度解纠缠域。本文提出的分析是揭示通过不同加工路线获得的聚合物性能差异的来源的有用工具。

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来源期刊

ACS Macro Letters 化学-

CiteScore

10.40

自引率

3.40%

发文量

209

审稿时长

1 months

期刊介绍： ACS Macro Letters publishes research in all areas of contemporary soft matter science in which macromolecules play a key role, including nanotechnology, self-assembly, supramolecular chemistry, biomaterials, energy generation and storage, and renewable/sustainable materials. Submissions to ACS Macro Letters should justify clearly the rapid disclosure of the key elements of the study. The scope of the journal includes high-impact research of broad interest in all areas of polymer science and engineering, including cross-disciplinary research that interfaces with polymer science. With the launch of ACS Macro Letters, all Communications that were formerly published in Macromolecules and Biomacromolecules will be published as Letters in ACS Macro Letters.